New ports to arm-uboot and arm-efi.

Mostly by Leif Lindholm with some additions from
	Francesco Lavra and cleanup by Vladimir Serbinenko.

	Also-By: Francesco Lavra <francescolavra.fl@gmail.com>

	Also-By: Vladimir Serbinenko <phcoder@gmail.com>

.bzrignore

@@ -206,6 +206,8 @@ po/*.gmo
 po/LINGUAS
 include/grub/gcrypt/gcrypt.h
 include/grub/gcrypt/g10lib.h
+grub-core/lib/dtc-grub
+grub-core/Makefile.libfdt.def
 po/POTFILES.in
 po/POTFILES-shell.in
 grub-glue-efi

ChangeLog

@@ -1,3 +1,11 @@
+2013-07-18  Leif Lindholm  <leif.lindholm@arm.com>
+2013-07-18  Francesco Lavra  <francescolavra.fl@gmail.com>
+2013-07-18  Vladimir Serbinenko  <phcoder@gmail.com>
+
+	New ports to arm-uboot and arm-efi.
+	Mostly by Leif Lindholm with some additions from
+	Francesco Lavra and cleanup by Vladimir Serbinenko.
+
 2013-07-16  Vladimir Serbinenko  <phcoder@gmail.com>
 
 	* grub-core/loader/multiboot_elfxx.c: Check eip after v2p translation

Makefile.util.def

@@ -167,6 +167,8 @@ program = {
   common = util/resolve.c;
   common = grub-core/kern/emu/argp_common.c;
 
+  common = grub-core/kern/arm/dl_helper.c;
+
   extra_dist = util/grub-mkimagexx.c;
 
   ldadd = libgrubmods.a;

acinclude.m4

@@ -432,3 +432,23 @@ dnl program.
 AC_DEFUN([grub_TRANSFORM],[dnl
 AC_SUBST(AS_TR_SH([$1]), [`AS_ECHO([$1]) | sed "$program_transform_name"`])dnl
 ])
+
+dnl Check if the C compiler supports `-mno-unaligned-access'.
+AC_DEFUN([grub_CHECK_NO_UNALIGNED_ACCESS],[
+[# foobar
+nua_possible=yes]
+AC_MSG_CHECKING([whether `$CC' supports `-mno-unaligned-access'])
+AC_LANG_CONFTEST([AC_LANG_SOURCE([[
+int main() {
+	return 0;
+}
+]])])
+
+[if eval "$ac_compile -S -mno-unaligned-access -o conftest.s" 2> /dev/null; then]
+  AC_MSG_RESULT([yes])
+  [rm -f conftest.s
+else
+  nua_possible=no]
+  AC_MSG_RESULT([no])
+[fi]
+])

conf/Makefile.common

@@ -37,6 +37,10 @@ if COND_sparc64_ieee1275
   CFLAGS_PLATFORM += -mno-app-regs
   LDFLAGS_PLATFORM = -Wl,-melf64_sparc -mno-relax
 endif
+if COND_arm
+  CFLAGS_PLATFORM += -mthumb-interwork -mlong-calls
+  LDFLAGS_PLATFORM = -Wl,--wrap=__clear_cache
+endif
 
 # Other options
 
@@ -115,6 +119,8 @@ CPPFLAGS_GNULIB = -I$(top_builddir)/grub-core/gnulib -I$(top_srcdir)/grub-core/g
 CFLAGS_POSIX = -fno-builtin
 CPPFLAGS_POSIX = -I$(top_srcdir)/grub-core/lib/posix_wrap
 
+CPPFLAGS_LIBFDT = -I$(top_srcdir)/grub-core/lib/dtc-grub/libfdt $(CPPFLAGS_POSIX)
+
 CFLAGS_GCRY = -Wno-error -Wno-missing-field-initializers $(CFLAGS_POSIX)
 CPPFLAGS_GCRY = -I$(top_srcdir)/grub-core/lib/libgcrypt_wrap $(CPPFLAGS_POSIX) -D_GCRYPT_IN_LIBGCRYPT=1 -I$(top_srcdir)/include/grub/gcrypt
 

conf/Makefile.extra-dist

@@ -18,6 +18,7 @@ EXTRA_DIST += conf/i386-pc-cygwin-img-ld.sc
 
 EXTRA_DIST += grub-core/Makefile.core.def
 EXTRA_DIST += grub-core/Makefile.gcry.def
+EXTRA_DIST += grub-core/Makefile.libfdt.def
 
 EXTRA_DIST += grub-core/genmoddep.awk
 EXTRA_DIST += grub-core/genmod.sh.in

configure.ac

@@ -96,6 +96,9 @@ case "$target_cpu" in
                 target_cpu=mips;
 		machine_CPPFLAGS="$machine_CPPFLAGS -DGRUB_CPU_MIPS=1";
 		;;
+  arm*)
+		target_cpu=arm;
+		;;
 esac
 
 # Specify the platform (such as firmware).
@@ -116,6 +119,7 @@ if test "x$with_platform" = x; then
     mipsel-*) platform=loongson ;;
     mips-*) platform=arc ;;
     ia64-*) platform=efi ;;
+    arm-*) platform=uboot ;;
     *) AC_MSG_ERROR([unsupported CPU: "$target_cpu"]) ;;
   esac
 else
@@ -151,6 +155,8 @@ case "$target_cpu"-"$platform" in
   mipsel-yeeloong) platform=loongson ;;
   mipsel-fuloong) platform=loongson ;;
   mipsel-loongson) ;;
+  arm-uboot) ;;
+  arm-efi) ;;
   *-emu) ;;
   *) AC_MSG_ERROR([platform "$platform" is not supported for target CPU "$target_cpu"]) ;;
 esac
@@ -182,6 +188,7 @@ case "$platform" in
   multiboot)	machine_CPPFLAGS="$machine_CPPFLAGS -DGRUB_MACHINE_MULTIBOOT=1" ;;
   efi)		machine_CPPFLAGS="$machine_CPPFLAGS -DGRUB_MACHINE_EFI=1" ;;
   ieee1275)	machine_CPPFLAGS="$machine_CPPFLAGS -DGRUB_MACHINE_IEEE1275=1" ;;
+  uboot)	machine_CPPFLAGS="$machine_CPPFLAGS -DGRUB_MACHINE_UBOOT=1" ;;
   qemu)		machine_CPPFLAGS="$machine_CPPFLAGS -DGRUB_MACHINE_QEMU=1" ;;
   pc)		machine_CPPFLAGS="$machine_CPPFLAGS -DGRUB_MACHINE_PCBIOS=1" ;;
   emu)		machine_CPPFLAGS="$machine_CPPFLAGS -DGRUB_MACHINE_EMU=1" ;;
@@ -190,6 +197,7 @@ case "$platform" in
   arc)	machine_CPPFLAGS="$machine_CPPFLAGS -DGRUB_MACHINE_ARC=1" ;;
 esac
 case "$target_cpu" in
+  arm)      	machine_CPPFLAGS="$machine_CPPFLAGS -DGRUB_MACHINE_ARM=1" ;;
   mips |mipsel)      	machine_CPPFLAGS="$machine_CPPFLAGS -DGRUB_MACHINE_MIPS=1" ;;
   sparc64)      machine_CPPFLAGS="$machine_CPPFLAGS -DGRUB_MACHINE_SPARC64=1" ;;
 esac
@@ -675,6 +683,14 @@ if test x"$sap_possible" = xyes; then
   TARGET_CFLAGS="$TARGET_CFLAGS -mno-stack-arg-probe"
 fi
 
+# -mno-unaligned-access
+if test "$target_cpu" = arm; then
+  grub_CHECK_NO_UNALIGNED_ACCESS
+  if test x"$nua_possible" = xyes; then
+    TARGET_CFLAGS="$TARGET_CFLAGS -mno-unaligned-access"
+  fi
+fi
+
 AC_ARG_ENABLE([werror],
 	      [AS_HELP_STRING([--disable-werror],
                              [do not use -Werror when building GRUB])])
@@ -1160,6 +1176,9 @@ AM_CONDITIONAL([COND_powerpc_ieee1275], [test x$target_cpu = xpowerpc -a x$platf
 AM_CONDITIONAL([COND_mips], [test x$target_cpu = xmips -o x$target_cpu = xmipsel])
 AM_CONDITIONAL([COND_mipsel], [test x$target_cpu = xmipsel])
 AM_CONDITIONAL([COND_mipseb], [test x$target_cpu = xmips])
+AM_CONDITIONAL([COND_arm], [test x$target_cpu = xarm ])
+AM_CONDITIONAL([COND_arm_uboot], [test x$target_cpu = xarm -a x$platform = xuboot])
+AM_CONDITIONAL([COND_arm_efi], [test x$target_cpu = xarm -a x$platform = xefi])
 
 AM_CONDITIONAL([COND_HOST_HURD], [test x$host_kernel = xhurd])
 AM_CONDITIONAL([COND_HOST_LINUX], [test x$host_kernel = xlinux])

docs/grub.texi

@@ -3436,6 +3436,7 @@ you forget a command, you can run the command @command{help}
 * crc::                         Compute or check CRC32 checksums
 * cryptomount::                 Mount a crypto device
 * date::                        Display or set current date and time
+* devicetree::                  Load a device tree blob
 * drivemap::                    Map a drive to another
 * echo::                        Display a line of text
 * eval::                        Evaluate agruments as GRUB commands
@@ -3747,6 +3748,17 @@ hour, minute, and second unchanged.
 @end deffn
 
 
+@node devicetree
+@subsection linux
+
+@deffn Command devicetree file
+Load a device tree blob (.dtb) from a filesystem, for later use by a Linux
+kernel. Does not perform merging with any device tree supplied by firmware,
+but rather replaces it completely.
+@ref{GNU/Linux}.
+@end deffn
+
+
 @node drivemap
 @subsection drivemap
 

gentpl.py

@@ -23,7 +23,7 @@ GRUB_PLATFORMS = [ "emu", "i386_pc", "i386_efi", "i386_qemu", "i386_coreboot",
                    "i386_multiboot", "i386_ieee1275", "x86_64_efi",
                    "mips_loongson", "sparc64_ieee1275",
                    "powerpc_ieee1275", "mips_arc", "ia64_efi",
-                   "mips_qemu_mips" ]
+                   "mips_qemu_mips", "arm_uboot", "arm_efi" ]
 
 GROUPS = {}
 
@@ -36,10 +36,12 @@ GROUPS["x86"]      = GROUPS["i386"] + GROUPS["x86_64"]
 GROUPS["mips"]     = [ "mips_loongson", "mips_qemu_mips", "mips_arc" ]
 GROUPS["sparc64"]  = [ "sparc64_ieee1275" ]
 GROUPS["powerpc"]  = [ "powerpc_ieee1275" ]
+GROUPS["arm"]      = [ "arm_uboot", "arm_efi" ]
 
 # Groups based on firmware
-GROUPS["efi"]  = [ "i386_efi", "x86_64_efi", "ia64_efi" ]
+GROUPS["efi"]  = [ "i386_efi", "x86_64_efi", "ia64_efi", "arm_efi" ]
 GROUPS["ieee1275"]   = [ "i386_ieee1275", "sparc64_ieee1275", "powerpc_ieee1275" ]
+GROUPS["uboot"] = [ "arm_uboot" ]
 
 # emu is a special case so many core functionality isn't needed on this platform
 GROUPS["noemu"]   = GRUB_PLATFORMS[:]; GROUPS["noemu"].remove("emu")
@@ -57,10 +59,13 @@ GROUPS["videomodules"]   = GRUB_PLATFORMS[:];
 for i in GROUPS["videoinkernel"]: GROUPS["videomodules"].remove(i)
 
 # Similar for terminfo
-GROUPS["terminfoinkernel"] = [ "emu", "mips_loongson", "mips_arc", "mips_qemu_mips" ] + GROUPS["ieee1275"];
+GROUPS["terminfoinkernel"] = [ "emu", "mips_loongson", "mips_arc", "mips_qemu_mips" ] + GROUPS["ieee1275"] + GROUPS["uboot"];
 GROUPS["terminfomodule"]   = GRUB_PLATFORMS[:];
 for i in GROUPS["terminfoinkernel"]: GROUPS["terminfomodule"].remove(i)
 
+# Flattened Device Trees (FDT)
+GROUPS["fdt"] = [ "arm_uboot", "arm_efi" ]
+
 # Miscelaneous groups schedulded to disappear in future
 GROUPS["i386_coreboot_multiboot_qemu"] = ["i386_coreboot", "i386_multiboot", "i386_qemu"]
 GROUPS["nopc"] = GRUB_PLATFORMS[:]; GROUPS["nopc"].remove("i386_pc")

grub-core/Makefile.am

@@ -203,6 +203,19 @@ KERNEL_HEADER_FILES += $(top_srcdir)/include/grub/extcmd.h
 KERNEL_HEADER_FILES += $(top_srcdir)/include/grub/lib/arg.h
 endif
 
+if COND_arm_uboot
+KERNEL_HEADER_FILES += $(top_srcdir)/include/grub/uboot/uboot.h
+KERNEL_HEADER_FILES += $(top_srcdir)/include/grub/uboot/disk.h
+KERNEL_HEADER_FILES += $(top_srcdir)/include/grub/extcmd.h
+KERNEL_HEADER_FILES += $(top_srcdir)/include/grub/lib/arg.h
+endif
+
+if COND_arm_efi
+KERNEL_HEADER_FILES += $(top_srcdir)/include/grub/arm/efi/loader.h
+KERNEL_HEADER_FILES += $(top_srcdir)/include/grub/efi/efi.h
+KERNEL_HEADER_FILES += $(top_srcdir)/include/grub/efi/disk.h
+endif
+
 if COND_emu
 KERNEL_HEADER_FILES += $(top_srcdir)/include/grub/datetime.h
 KERNEL_HEADER_FILES += $(top_srcdir)/include/grub/emu/misc.h

grub-core/Makefile.core.def

@@ -59,6 +59,9 @@ kernel = {
   ia64_efi_ldflags = '-Wl,-r,-d';
   ia64_efi_stripflags = '--strip-unneeded -K start -R .note -R .comment -R .note.gnu.gold-version';
 
+  arm_efi_ldflags          = '-Wl,-r,-d';
+  arm_efi_stripflags       = '--strip-unneeded -K start -R .note -R .comment -R .note.gnu.gold-version';
+
   i386_pc_ldflags          = '$(TARGET_IMG_LDFLAGS)';
   i386_pc_ldflags          = '$(TARGET_IMG_BASE_LDOPT),0x9000';
 
@@ -81,6 +84,8 @@ kernel = {
   i386_qemu_cppflags     = '-DGRUB_BOOT_MACHINE_LINK_ADDR=$(GRUB_BOOT_MACHINE_LINK_ADDR)';
   emu_cflags = '$(CFLAGS_GNULIB)';
   emu_cppflags = '$(CPPFLAGS_GNULIB)';
+  arm_uboot_ldflags       = '-Wl,-Ttext=0x08000000';
+  arm_uboot_stripflags    = '--strip-unneeded -K start -R .note -R .comment -R .note.gnu.gold-version';
 
   i386_pc_startup = kern/i386/pc/startup.S;
   i386_efi_startup = kern/i386/efi/startup.S;
@@ -92,6 +97,8 @@ kernel = {
   mips_startup = kern/mips/startup.S;
   sparc64_ieee1275_startup = kern/sparc64/ieee1275/crt0.S;
   powerpc_ieee1275_startup = kern/powerpc/ieee1275/startup.S;
+  arm_uboot_startup = kern/arm/uboot/startup.S;
+  arm_efi_startup = kern/arm/efi/startup.S;
 
   common = kern/command.c;
   common = kern/corecmd.c;
@@ -127,6 +134,12 @@ kernel = {
   ieee1275 = term/ieee1275/console.c;
   ieee1275 = kern/ieee1275/init.c;
 
+  uboot = disk/uboot/ubootdisk.c;
+  uboot = kern/uboot/uboot.c;
+  uboot = kern/uboot/init.c;
+  uboot = kern/uboot/hw.c;
+  uboot = term/uboot/console.c;
+
   terminfoinkernel = term/terminfo.c;
   terminfoinkernel = term/tparm.c;
   terminfoinkernel = commands/extcmd.c;
@@ -161,6 +174,9 @@ kernel = {
   ia64_efi = kern/ia64/dl.c;
   ia64_efi = kern/ia64/dl_helper.c;
 
+  arm_efi = kern/arm/efi/init.c;
+  arm_efi = kern/arm/efi/misc.c;
+
   i386_pc = kern/i386/pc/init.c;
   i386_pc = kern/i386/pc/mmap.c;
   i386_pc = term/i386/pc/console.c;
@@ -213,6 +229,13 @@ kernel = {
   sparc64_ieee1275 = kern/sparc64/dl.c;
   sparc64_ieee1275 = kern/sparc64/ieee1275/ieee1275.c;
 
+  arm = kern/arm/dl.c;
+  arm = kern/arm/dl_helper.c;
+  arm = kern/arm/cache_armv6.S;
+  arm = kern/arm/cache_armv7.S;
+  arm = kern/arm/cache.c;
+  arm = kern/arm/misc.S;
+
   emu = disk/host.c;
   emu = gnulib/progname.c;
   emu = kern/emu/error.c;
@@ -673,6 +696,8 @@ module = {
   enable = powerpc_ieee1275;
   enable = mips_arc;
   enable = ia64_efi;
+  enable = arm_efi;
+  enable = arm_uboot;
 };
 
 module = {
@@ -753,6 +778,7 @@ module = {
   efi = lib/efi/halt.c;
   ieee1275 = lib/ieee1275/halt.c;
   emu = lib/emu/halt.c;
+  uboot = lib/uboot/halt.c;
 };
 
 module = {
@@ -761,11 +787,13 @@ module = {
   i386 = lib/i386/reboot_trampoline.S;
   ia64_efi = lib/efi/reboot.c;
   x86_64_efi = lib/efi/reboot.c;
+  arm_efi = lib/efi/reboot.c;
   powerpc_ieee1275 = lib/ieee1275/reboot.c;
   sparc64_ieee1275 = lib/ieee1275/reboot.c;
   mips_arc = lib/mips/arc/reboot.c;
   mips_loongson = lib/mips/loongson/reboot.c;
   mips_qemu_mips = lib/mips/qemu_mips/reboot.c;
+  uboot = lib/uboot/reboot.c;
   common = commands/reboot.c;
 };
 
@@ -1441,6 +1469,7 @@ module = {
   name = datetime;
   cmos = lib/cmos_datetime.c;
   efi = lib/efi/datetime.c;
+  uboot = lib/uboot/datetime.c;
   sparc64_ieee1275 = lib/ieee1275/datetime.c;
   powerpc_ieee1275 = lib/ieee1275/datetime.c;
   sparc64_ieee1275 = lib/ieee1275/cmos.c;
@@ -1460,6 +1489,7 @@ module = {
   extra_dist = lib/powerpc/setjmp.S;
   extra_dist = lib/ia64/setjmp.S;
   extra_dist = lib/ia64/longjmp.S;
+  extra_dist = lib/arm/setjmp.S;
 };
 
 module = {
@@ -1539,6 +1569,8 @@ module = {
   powerpc_ieee1275 = loader/powerpc/ieee1275/linux.c;
   sparc64_ieee1275 = loader/sparc64/ieee1275/linux.c;
   ia64_efi = loader/ia64/efi/linux.c;
+  arm = loader/arm/linux.c;
+  arm = lib/fdt.c;
   common = loader/linux.c;
   common = lib/cmdline.c;
   enable = noemu;
@@ -1590,6 +1622,7 @@ module = {
 
   enable = x86;
   enable = ia64_efi;
+  enable = arm_efi;
   enable = mips;
 };
 
@@ -1922,6 +1955,12 @@ module = {
   enable = ieee1275;
 };
 
+module = {
+  name = ubootnet;
+  common = net/drivers/uboot/ubootnet.c;
+  enable = uboot;
+};
+
 module = {
   name = efinet;
   common = net/drivers/efi/efinet.c;

grub-core/disk/uboot/ubootdisk.c

@@ -0,0 +1,299 @@
+/* ubootdisk.c - disk subsystem support for U-Boot platforms */
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 2013  Free Software Foundation, Inc.
+ *
+ *  GRUB is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  GRUB is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <grub/disk.h>
+#include <grub/err.h>
+#include <grub/misc.h>
+#include <grub/mm.h>
+#include <grub/partition.h>
+#include <grub/term.h>
+#include <grub/types.h>
+#include <grub/uboot/disk.h>
+#include <grub/uboot/uboot.h>
+#include <grub/uboot/api_public.h>
+
+static struct ubootdisk_data *hd_devices;
+static int hd_num;
+static int hd_max;
+
+/*
+ * grub_ubootdisk_register():
+ *   Called for each disk device enumerated as part of U-Boot initialization
+ *   code.
+ */
+grub_err_t
+grub_ubootdisk_register (struct device_info *newdev)
+{
+  struct ubootdisk_data *d;
+
+#define STOR_TYPE(x) ((x) & 0x0ff0)
+  switch (STOR_TYPE (newdev->type))
+    {
+    case DT_STOR_IDE:
+    case DT_STOR_SATA:
+    case DT_STOR_MMC:
+    case DT_STOR_USB:
+      /* hd */
+      if (hd_num == hd_max)
+	{
+	  int new_num;
+	  new_num = (hd_max ? hd_max * 2 : 1);
+	  d = grub_realloc(hd_devices,
+			   sizeof (struct ubootdisk_data) * new_num);
+	  if (!d)
+	    return grub_errno;
+	  hd_devices = d;
+	  hd_max = new_num;
+	}
+
+      d = &hd_devices[hd_num];
+      hd_num++;
+      break;
+    default:
+      return GRUB_ERR_BAD_DEVICE;
+      break;
+    }
+
+  d->dev = newdev;
+  d->cookie = newdev->cookie;
+  d->opencount = 0;
+
+  return 0;
+}
+
+/*
+ * uboot_disk_iterate():
+ *   Iterator over enumerated disk devices.
+ */
+static int
+uboot_disk_iterate (grub_disk_dev_iterate_hook_t hook, void *hook_data,
+		    grub_disk_pull_t pull)
+{
+  char buf[16];
+  int count;
+
+  switch (pull)
+    {
+    case GRUB_DISK_PULL_NONE:
+      /* "hd" - built-in mass-storage */
+      for (count = 0 ; count < hd_num; count++)
+	{
+	  grub_snprintf (buf, sizeof (buf) - 1, "hd%d", count);
+	  grub_dprintf ("ubootdisk", "iterating %s\n", buf);
+	  if (hook (buf, hook_data))
+	    return 1;
+	}
+      break;
+    default:
+      return 0;
+    }
+
+  return 0;
+}
+
+/* Helper function for uboot_disk_open. */
+static struct ubootdisk_data *
+get_hd_device (int num)
+{
+  if (num < hd_num)
+    return &hd_devices[num];
+
+  return NULL;
+}
+
+/*
+ * uboot_disk_open():
+ *   Opens a disk device already enumerated.
+ */
+static grub_err_t
+uboot_disk_open (const char *name, struct grub_disk *disk)
+{
+  struct ubootdisk_data *d;
+  struct device_info *devinfo;
+  int num;
+  int retval;
+
+  grub_dprintf ("ubootdisk", "Opening '%s'\n", name);
+
+  num = grub_strtoul (name + 2, 0, 10);
+  if (grub_errno != GRUB_ERR_NONE)
+    {
+      grub_dprintf ("ubootdisk", "Opening '%s' failed, invalid number\n",
+		    name);
+      goto fail;
+    }
+
+  if (name[1] != 'd')
+    {
+      grub_dprintf ("ubootdisk", "Opening '%s' failed, invalid name\n", name);
+      goto fail;
+    }
+
+  switch (name[0])
+    {
+    case 'h':
+      d = get_hd_device (num);
+      break;
+    default:
+      goto fail;
+    }
+
+  if (!d)
+    goto fail;
+
+  /*
+   * Subsystems may call open on the same device recursively - but U-Boot
+   * does not deal with this. So simply keep track of number of calls and
+   * return success if already open.
+   */
+  if (d->opencount > 0)
+    {
+      grub_dprintf ("ubootdisk", "(%s) already open\n", disk->name);
+      d->opencount++;
+      retval = 0;
+    }
+  else
+    {
+      retval = grub_uboot_dev_open (d->dev);
+      if (retval != 0)
+	goto fail;
+      d->opencount = 1;
+    }
+
+  grub_dprintf ("ubootdisk", "cookie: 0x%08x\n", (grub_addr_t) d->cookie);
+  disk->id = (grub_addr_t) d->cookie;
+
+  devinfo = d->dev;
+
+  d->block_size = devinfo->di_stor.block_size;
+  if (d->block_size == 0)
+    {
+      grub_printf ("%s: no block size!\n", __FUNCTION__);
+      return GRUB_ERR_IO;
+    }
+
+  for (disk->log_sector_size = 0;
+       (1U << disk->log_sector_size) < d->block_size;
+       disk->log_sector_size++);
+
+  grub_dprintf ("ubootdisk", "(%s) blocksize=%d, log_sector_size=%d\n",
+		disk->name, d->block_size, disk->log_sector_size);
+
+  if (devinfo->di_stor.block_count)
+    disk->total_sectors = devinfo->di_stor.block_count;
+  else
+    disk->total_sectors = GRUB_DISK_SIZE_UNKNOWN;
+
+  disk->data = d;
+
+  return GRUB_ERR_NONE;
+
+fail:
+  return grub_error (GRUB_ERR_UNKNOWN_DEVICE, "no such device");
+}
+
+static void
+uboot_disk_close (struct grub_disk *disk)
+{
+  struct ubootdisk_data *d;
+  int retval;
+
+  d = disk->data;
+
+  /*
+   * In mirror of open function, keep track of number of calls to close and
+   * send on to U-Boot only when opencount would decrease to 0.
+   */
+  if (d->opencount > 1)
+    {
+      grub_dprintf ("ubootdisk", "Closed (%s)\n", disk->name);
+
+      d->opencount--;
+    }
+  else if (d->opencount == 1)
+    {
+      retval = grub_uboot_dev_close (d->dev);
+      d->opencount--;
+      grub_dprintf ("ubootdisk", "closed %s (%d)\n", disk->name, retval);
+    }
+  else
+    {
+      grub_dprintf ("ubootdisk", "device %s not open!\n", disk->name);
+    }
+}
+
+/*
+ * uboot_disk_read():
+ *   Called from within disk subsystem to read a sequence of blocks into the
+ *   disk cache. Maps directly on top of U-Boot API, only wrap in some error
+ *   handling.
+ */
+static grub_err_t
+uboot_disk_read (struct grub_disk *disk,
+		 grub_disk_addr_t offset, grub_size_t numblocks, char *buf)
+{
+  struct ubootdisk_data *d;
+  grub_size_t real_size;
+  int retval;
+
+  d = disk->data;
+
+  retval = grub_uboot_dev_read (d->dev, buf, numblocks, offset, &real_size);
+  grub_dprintf ("ubootdisk",
+		"retval=%d, numblocks=%d, real_size=%llu, sector=%llu\n",
+		retval, numblocks, (grub_uint64_t) real_size,
+		(grub_uint64_t) offset);
+  if (retval != 0)
+    return grub_error (GRUB_ERR_IO, "U-Boot disk read error");
+
+  return GRUB_ERR_NONE;
+}
+
+static grub_err_t
+uboot_disk_write (struct grub_disk *disk __attribute__ ((unused)),
+		  grub_disk_addr_t sector __attribute__ ((unused)),
+		  grub_size_t size __attribute__ ((unused)),
+		  const char *buf __attribute__ ((unused)))
+{
+  return grub_error (GRUB_ERR_NOT_IMPLEMENTED_YET,
+		     "attempt to write (not supported)");
+}
+
+static struct grub_disk_dev grub_ubootdisk_dev = {
+  .name = "ubootdisk",
+  .id = GRUB_DISK_DEVICE_UBOOTDISK_ID,
+  .iterate = uboot_disk_iterate,
+  .open = uboot_disk_open,
+  .close = uboot_disk_close,
+  .read = uboot_disk_read,
+  .write = uboot_disk_write,
+  .next = 0
+};
+
+void
+grub_ubootdisk_init (void)
+{
+  grub_disk_dev_register (&grub_ubootdisk_dev);
+}
+
+void
+grub_ubootdisk_fini (void)
+{
+  grub_disk_dev_unregister (&grub_ubootdisk_dev);
+}

grub-core/kern/arm/cache.S

@@ -0,0 +1,130 @@
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 2013  Free Software Foundation, Inc.
+ *
+ *  GRUB is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  GRUB is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <grub/symbol.h>
+
+	.file	"cache.S"
+	.text
+	.syntax	unified
+	.arm
+#if !defined (ARMV6) && !defined (ARMV7)
+# error Unsupported architecture version!
+#endif
+
+	.align	2
+
+/*
+ * Simple cache maintenance functions
+ */
+
+@ r0 - *beg (inclusive)
+@ r1 - *end (exclusive)
+clean_dcache_range:
+	@ Clean data cache for range to point-of-unification
+	ldr	r2, =EXT_C(grub_arch_cache_dlinesz)
+	sub	r3, r2, #1		@ align "beg" to start of line
+	mvn	r3, r3
+	and	r0, r0, r3
+1:	cmp	r0, r1
+	bge	2f
+#ifdef ARMV6
+	mcr	p15, 0, r0, c7, c10, 1	@ Clean data cache line by MVA
+#else
+	mcr	p15, 0, r0, c7, c11, 1	@ DCCMVAU
+#endif
+	add	r0, r0, r2		@ Next line
+	b	1b
+2:	DSB
+	bx	lr
+
+@ r0 - *beg (inclusive)
+@ r1 - *end (exclusive)
+invalidate_icache_range:
+	@ Invalidate instruction cache for range to point-of-unification
+	ldr	r2, =EXT_C(grub_arch_cache_ilinesz)
+	sub	r3, r2, #1		@ align "beg" to start of line
+	mvn	r3, r3
+	and	r0, r0, r3
+1:	cmp	r0, r1
+	bge	2f
+	mcr	p15, 0, r0, c7, c5, 1	@ ICIMVAU
+	add	r0, r0, r2		@ Next line
+	b	1b
+	@ Branch predictor invalidate all
+2:	mcr	p15, 0, r0, c7,	c5, 6	@ BPIALL
+	DSB
+	ISB
+	bx	lr
+
+@void grub_arch_sync_caches (void *address, grub_size_t len)
+#ifdef ARMV6
+FUNCTION(grub_arch_sync_caches_armv6)
+#else
+FUNCTION(grub_arch_sync_caches_armv7)
+#endif
+	add	r1, r0, r1
+	DSB
+	push	{r0-r1, r4-r6, lr}
+	ldrdeq	r0, r1, [sp]
+	bl	clean_dcache_range
+	pop	{r0, r1}
+	bl	invalidate_icache_range
+	pop	{r4-r6, pc}
+
+#ifdef ARMV6
+FUNCTION(grub_arm_disable_caches_mmu_armv6)
+#else
+FUNCTION(grub_arm_disable_caches_mmu_armv7)
+#endif
+
+	push	{r4, lr}
+
+	@ disable D-cache
+	mrc	p15, 0, r0, c1, c0, 0
+	bic	r0, r0, #(1 << 2)
+	mcr	p15, 0, r0, c1, c0, 0
+	DSB
+	ISB
+
+	@ clean/invalidate D-cache
+	bl	clean_invalidate_dcache
+
+	@ disable I-cache
+	mrc	p15, 0, r0, c1, c0, 0
+	bic	r0, r0, #(1 << 12)
+	mcr	p15, 0, r0, c1, c0, 0
+	DSB
+	ISB
+
+	@ invalidate I-cache (also invalidates branch predictors)
+	mcr	p15, 0, r0, c7, c5, 0
+	DSB
+	ISB
+
+	@ clear SCTLR M bit
+	mrc	p15, 0, r0, c1, c0, 0
+	bic	r0, r0, #(1 << 0)
+	mcr	p15, 0, r0, c1, c0, 0
+
+	mcr	p15, 0, r0, c8, c7, 0	@ invalidate TLB
+	mcr	p15, 0, r0, c7, c5, 6	@ invalidate branch predictor
+	DSB
+	ISB
+
+	pop	{r4, pc}
+

grub-core/kern/arm/cache.c

@@ -0,0 +1,108 @@
+#include <grub/dl.h>
+#include <grub/cache.h>
+#include <grub/arm/system.h>
+
+/* This is only about cache architecture. It doesn't imply
+   the CPU architecture.  */
+static enum
+  {
+    ARCH_UNKNOWN,
+    ARCH_ARMV6,
+    ARCH_ARMV6_UNIFIED,
+    ARCH_ARMV7
+  } type = ARCH_UNKNOWN;
+
+grub_uint32_t grub_arch_cache_dlinesz;
+grub_uint32_t grub_arch_cache_ilinesz;
+
+/* Prototypes for asm functions.  */
+void grub_arch_sync_caches_armv6 (void *address, grub_size_t len);
+void grub_arch_sync_caches_armv7 (void *address, grub_size_t len);
+void grub_arm_disable_caches_mmu_armv6 (void);
+void grub_arm_disable_caches_mmu_armv7 (void);
+
+static void
+probe_caches (void)
+{
+  grub_uint32_t main_id, cache_type;
+
+  /* Read main ID Register */
+  asm volatile ("mrc 	p15, 0, %0, c0, c0, 0": "=r"(main_id));
+
+  if (((main_id >> 16) & 0x7) != 0x7)
+    grub_fatal ("Unsupported ARM ID 0x%x", main_id);
+
+  /* Read Cache Type Register */
+  asm volatile ("mrc 	p15, 0, %0, c0, c0, 1": "=r"(cache_type));
+
+  switch (cache_type >> 24)
+    {
+    case 0x04:
+    case 0x0a:
+    case 0x0c:
+    case 0x0e:
+    case 0x1c:
+      grub_arch_cache_dlinesz = 8 << ((cache_type >> 12) & 3);
+      grub_arch_cache_ilinesz = 8 << (cache_type & 3);
+      type = ARCH_ARMV6_UNIFIED;
+      break;
+    case 0x05:
+    case 0x0b:
+    case 0x0d:
+    case 0x0f:
+    case 0x1d:
+      grub_arch_cache_dlinesz = 8 << ((cache_type >> 12) & 3);
+      grub_arch_cache_ilinesz = 8 << (cache_type & 3);
+      type = ARCH_ARMV6;
+      break;
+    case 0x80 ... 0x8f:
+      grub_arch_cache_dlinesz = 4 << ((cache_type >> 16) & 0xf);
+      grub_arch_cache_ilinesz = 4 << (cache_type & 0xf);
+      type = ARCH_ARMV7;
+      break;
+    default:
+      grub_fatal ("Unsupported cache type 0x%x", cache_type);
+    }
+}
+
+void
+grub_arch_sync_caches (void *address, grub_size_t len)
+{
+  if (type == ARCH_UNKNOWN)
+    probe_caches ();
+  switch (type)
+    {
+    case ARCH_ARMV6:
+      grub_arch_sync_caches_armv6 (address, len);
+      break;
+    case ARCH_ARMV7:
+      grub_arch_sync_caches_armv7 (address, len);
+      break;
+      /* Nothing to do.  */
+    case ARCH_ARMV6_UNIFIED:
+      break;
+      /* Pacify GCC.  */
+    case ARCH_UNKNOWN:
+      break;
+    }
+}
+
+void
+grub_arm_disable_caches_mmu (void)
+{
+  if (type == ARCH_UNKNOWN)
+    probe_caches ();
+  switch (type)
+    {
+    case ARCH_ARMV6_UNIFIED:
+    case ARCH_ARMV6:
+      grub_arm_disable_caches_mmu_armv6 ();
+      break;
+    case ARCH_ARMV7:
+      grub_arm_disable_caches_mmu_armv7 ();
+      break;
+      /* Pacify GCC.  */
+    case ARCH_UNKNOWN:
+      break;
+    }
+}

grub-core/kern/arm/cache_armv6.S

@@ -0,0 +1,35 @@
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 2013  Free Software Foundation, Inc.
+ *
+ *  GRUB is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  GRUB is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <grub/symbol.h>
+
+	.file	"cache_armv6.S"
+	.text
+	.syntax	unified
+	.arm
+	.arch	armv6
+# define DMB	mcr	p15, 0, r0, c7, c10, 5
+# define DSB	mcr	p15, 0, r0, c7, c10, 4
+# define ISB	mcr	p15, 0, r0, c7, c5, 4
+#define ARMV6 1
+
+clean_invalidate_dcache:
+	mcr	p15, 0, r0, c7, c14, 0	@ Clean/Invalidate D-cache
+	bx	lr
+
+#include "cache.S"

grub-core/kern/arm/cache_armv7.S

@@ -0,0 +1,114 @@
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 2013  Free Software Foundation, Inc.
+ *
+ *  GRUB is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  GRUB is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <grub/symbol.h>
+
+	.file	"cache_armv7.S"
+	.text
+	.syntax	unified
+	.arm
+	.arch	armv7a
+# define DMB	dmb
+# define DSB	dsb
+# define ISB	isb
+#define ARMV7 1
+
+	@ r0  - CLIDR
+	@ r1  - LoC
+	@ r2  - current level
+	@ r3  - num sets
+	@ r4  - num ways
+	@ r5  - current set
+	@ r6  - current way
+	@ r7  - line size
+	@ r8  - scratch
+	@ r9  - scratch
+	@ r10 - scratch
+	@ r11 - scratch
+clean_invalidate_dcache:
+	push	{r4-r12, lr}
+	mrc 	p15, 1, r0, c0, c0, 1	@ Read CLIDR
+	lsr	r1, r0, #24		@ Extract LoC
+	and	r1, r1, #0x7
+
+	mov	r2, #0			@ First level, L1
+2:	and	r8, r0, #7		@ cache type at current level
+	cmp	r8, #2
+	blt	5f			@ instruction only, or none, skip level
+
+	@ set current cache level/type (for CCSIDR read)
+	lsl	r8, r2, #1
+	mcr	p15, 2, r8, c0, c0, 0	@ Write CSSELR (level, type: data/uni)
+
+	@ read current cache information
+	mrc	p15, 1, r8, c0, c0, 0	@ Read CCSIDR
+	lsr	r3, r8, #13		@ Number of sets -1
+	ldr	r9, =0x3fff
+	and	r3, r3, r9
+	lsr	r4, r8, #3		@ Number of ways -1
+	ldr	r9, =0x1ff
+	and	r4, r4, r9
+	and	r7, r8, #7		@ log2(line size in words) - 2
+	add	r7, r7, #2		@  adjust
+	mov	r8, #1
+	lsl	r7, r8, r7		@  -> line size in words
+	lsl	r7, r7, #2		@  -> bytes
+
+	@ set loop
+	mov	r5, #0			@ current set = 0
+3:	lsl	r8, r2, #1		@ insert level
+	clz	r9, r7			@ calculate set field offset
+	mov	r10, #31
+	sub	r9, r10, r9
+	lsl	r10, r5, r9
+	orr	r8, r8, r10		@ insert set field
+
+	@ way loop
+	@ calculate way field offset
+	mov	r6, #0			@ current way = 0
+	add	r10, r4, #1
+	clz	r9, r10			@ r9 = way field offset
+	add	r9, r9, #1
+4:	lsl	r10, r6, r9
+	orr	r11, r8, r10		@ insert way field
+
+	@ clean and invalidate line by set/way
+	mcr	p15, 0, r11, c7, c14, 2	@ DCCISW
+
+	@ next way
+	add	r6, r6, #1
+	cmp	r6, r4
+	ble	4b
+
+	@ next set
+	add	r5, r5, #1
+	cmp	r5, r3
+	ble	3b
+
+	@ next level
+5:	lsr	r0, r0, #3		@ align next level CLIDR 'type' field
+	add	r2, r2, #1		@ increment cache level counter
+	cmp	r2, r1
+	blt	2b			@ outer loop
+
+	@ return
+6:	DSB
+	ISB
+	pop	{r4-r12, pc}
+
+#include "cache.S"

grub-core/kern/arm/dl.c

@@ -0,0 +1,201 @@
+/* dl.c - arch-dependent part of loadable module support */
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 2013  Free Software Foundation, Inc.
+ *
+ *  GRUB is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  GRUB is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <grub/dl.h>
+#include <grub/elf.h>
+#include <grub/misc.h>
+#include <grub/err.h>
+#include <grub/mm.h>
+#include <grub/i18n.h>
+#include <grub/arm/reloc.h>
+
+/*************************************************
+ * Runtime dynamic linker with helper functions. *
+ *************************************************/
+static grub_err_t
+do_relocations (Elf_Shdr * relhdr, Elf_Ehdr * e, grub_dl_t mod)
+{
+  grub_dl_segment_t seg;
+  Elf_Rel *rel;
+  Elf_Sym *sym;
+  int i, entnum;
+
+  entnum = relhdr->sh_size / sizeof (Elf_Rel);
+
+  /* Find the target segment for this relocation section. */
+  for (seg = mod->segment ; seg ; seg = seg->next)
+    if (seg->section == relhdr->sh_info)
+      break;
+  if (!seg)
+    return grub_error (GRUB_ERR_EOF, N_("relocation segment not found"));
+
+  rel = (Elf_Rel *) ((grub_addr_t) e + relhdr->sh_offset);
+
+  /* Step through all relocations */
+  for (i = 0, sym = mod->symtab; i < entnum; i++)
+    {
+      Elf_Addr *target, sym_addr;
+      int relsym, reltype;
+      grub_err_t retval;
+
+      if (seg->size < rel[i].r_offset)
+	return grub_error (GRUB_ERR_BAD_MODULE,
+			   "reloc offset is out of the segment");
+      relsym = ELF_R_SYM (rel[i].r_info);
+      reltype = ELF_R_TYPE (rel[i].r_info);
+      target = (void *) ((grub_addr_t) seg->addr + rel[i].r_offset);
+
+      sym_addr = sym[relsym].st_value;
+
+      switch (reltype)
+	{
+	case R_ARM_ABS32:
+	  {
+	    /* Data will be naturally aligned */
+	    retval = grub_arm_reloc_abs32 (target, sym_addr);
+	    if (retval != GRUB_ERR_NONE)
+	      return retval;
+	  }
+	  break;
+	case R_ARM_CALL:
+	case R_ARM_JUMP24:
+	  {
+	    retval = grub_arm_reloc_jump24 (target, sym_addr);
+	    if (retval != GRUB_ERR_NONE)
+	      return retval;
+	  }
+	  break;
+	case R_ARM_THM_CALL:
+	case R_ARM_THM_JUMP24:
+	  {
+	    /* Thumb instructions can be 16-bit aligned */
+	    retval = grub_arm_reloc_thm_call ((grub_uint16_t *) target, sym_addr);
+	    if (retval != GRUB_ERR_NONE)
+	      return retval;
+	  }
+	  break;
+	case R_ARM_THM_JUMP19:
+	  {
+	    /* Thumb instructions can be 16-bit aligned */
+	    retval = grub_arm_reloc_thm_jump19 ((grub_uint16_t *) target, sym_addr);
+	    if (retval != GRUB_ERR_NONE)
+	      return retval;
+	  }
+	  break;
+	default:
+	  return grub_error (GRUB_ERR_NOT_IMPLEMENTED_YET,
+			     N_("relocation 0x%x is not implemented yet"),
+			     reltype);
+	}
+    }
+
+  return GRUB_ERR_NONE;
+}
+
+
+/*
+ * Check if EHDR is a valid ELF header.
+ */
+grub_err_t
+grub_arch_dl_check_header (void *ehdr)
+{
+  Elf_Ehdr *e = ehdr;
+
+  /* Check the magic numbers.  */
+  if (e->e_ident[EI_CLASS] != ELFCLASS32
+      || e->e_ident[EI_DATA] != ELFDATA2LSB || e->e_machine != EM_ARM)
+    return grub_error (GRUB_ERR_BAD_OS,
+		       N_("invalid arch-dependent ELF magic"));
+
+  return GRUB_ERR_NONE;
+}
+
+/*
+ * Verify that provided ELF header contains reference to a symbol table
+ */
+static int
+has_symtab (Elf_Ehdr * e)
+{
+  int i;
+  Elf_Shdr *s;
+
+  for (i = 0, s = (Elf_Shdr *) ((grub_uint32_t) e + e->e_shoff);
+       i < e->e_shnum;
+       i++, s = (Elf_Shdr *) ((grub_uint32_t) s + e->e_shentsize))
+    if (s->sh_type == SHT_SYMTAB)
+      return 1;
+
+  return 0;
+}
+
+/*
+ * grub_arch_dl_relocate_symbols():
+ *   Only externally visible function in this file.
+ *   Locates the relocations section of the ELF object, and calls
+ *   do_relocations() to deal with it.
+ */
+grub_err_t
+grub_arch_dl_relocate_symbols (grub_dl_t mod, void *ehdr)
+{
+  Elf_Ehdr *e = ehdr;
+  Elf_Shdr *s;
+  unsigned i;
+
+  if (!has_symtab (e))
+    return grub_error (GRUB_ERR_BAD_MODULE, N_("no symbol table"));
+
+#define FIRST_SHDR(x) ((Elf_Shdr *) ((grub_addr_t)(x) + (x)->e_shoff))
+#define NEXT_SHDR(x, y) ((Elf_Shdr *) ((grub_addr_t)(y) + (x)->e_shentsize))
+
+  for (i = 0, s = FIRST_SHDR (e); i < e->e_shnum; i++, s = NEXT_SHDR (e, s))
+    {
+      grub_err_t ret;
+
+      switch (s->sh_type)
+	{
+	case SHT_REL:
+	  {
+	    /* Relocations, no addends */
+	    ret = do_relocations (s, e, mod);
+	    if (ret != GRUB_ERR_NONE)
+	      return ret;
+	  }
+	  break;
+	case SHT_NULL:
+	case SHT_PROGBITS:
+	case SHT_SYMTAB:
+	case SHT_STRTAB:
+	case SHT_NOBITS:
+	case SHT_ARM_ATTRIBUTES:
+	  break;
+	case SHT_RELA:
+	default:
+	  {
+	    grub_dprintf ("dl", "unhandled section_type: %d (0x%08x)\n",
+			 s->sh_type, s->sh_type);
+	    return GRUB_ERR_NOT_IMPLEMENTED_YET;
+	  };
+	}
+    }
+
+#undef FIRST_SHDR
+#undef NEXT_SHDR
+
+  return GRUB_ERR_NONE;
+}

grub-core/kern/arm/dl_helper.c

@@ -0,0 +1,222 @@
+/* dl.c - arch-dependent part of loadable module support */
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 2013  Free Software Foundation, Inc.
+ *
+ *  GRUB is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  GRUB is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <grub/dl.h>
+#include <grub/elf.h>
+#include <grub/misc.h>
+#include <grub/err.h>
+#include <grub/mm.h>
+#include <grub/i18n.h>
+#include <grub/arm/reloc.h>
+
+/*
+ * R_ARM_ABS32
+ *
+ * Simple relocation of 32-bit value (in literal pool)
+ */
+grub_err_t
+grub_arm_reloc_abs32 (Elf32_Word *target, Elf32_Addr sym_addr)
+{
+  Elf32_Addr tmp;
+
+  tmp = grub_le_to_cpu32 (*target);
+  tmp += sym_addr;
+  *target = grub_cpu_to_le32 (tmp);
+  grub_dprintf ("dl", "  %s:  reloc_abs32 0x%08x => 0x%08x", __FUNCTION__,
+		(unsigned int) sym_addr, (unsigned int) tmp);
+
+  return GRUB_ERR_NONE;
+}
+
+/********************************************************************
+ * Thumb (T32) relocations:                                         *
+ *                                                                  *
+ * 32-bit Thumb instructions can be 16-bit aligned, and are fetched *
+ * little-endian, requiring some additional fiddling.               *
+ ********************************************************************/
+
+/*
+ * R_ARM_THM_CALL/THM_JUMP24
+ *
+ * Relocate Thumb (T32) instruction set relative branches:
+ *   B.W, BL and BLX
+ */
+grub_err_t
+grub_arm_reloc_thm_call (grub_uint16_t *target, Elf32_Addr sym_addr)
+{
+  grub_int32_t offset, offset_low, offset_high;
+  grub_uint32_t sign, j1, j2, is_blx;
+  grub_uint32_t insword, insmask;
+
+  /* Extract instruction word in alignment-safe manner */
+  insword = (grub_le_to_cpu16 (*target) << 16)
+    | (grub_le_to_cpu16(*(target + 1)));
+  insmask = 0xf800d000;
+
+  /* B.W/BL or BLX? Affects range and expected target state */
+  if (((insword >> 12) & 0xd) == 0xc)
+    is_blx = 1;
+  else
+    is_blx = 0;
+
+  /* If BLX, target symbol must be ARM (target address LSB == 0) */
+  if (is_blx && (sym_addr & 1))
+    return grub_error (GRUB_ERR_BAD_MODULE,
+		       N_("Relocation targeting wrong execution state"));
+
+  offset_low = -16777216;
+  offset_high = is_blx ? 16777212 : 16777214;
+
+  /* Extract bitfields from instruction words */
+  sign = (insword >> 26) & 1;
+  j1 = (insword >> 13) & 1;
+  j2 = (insword >> 11) & 1;
+  offset = (sign << 24) | ((~(j1 ^ sign) & 1) << 23) |
+    ((~(j2 ^ sign) & 1) << 22) |
+    ((insword & 0x03ff0000) >> 4) | ((insword & 0x000007ff) << 1);
+
+  /* Sign adjust and calculate offset */
+  if (offset & (1 << 24))
+    offset -= (1 << 25);
+
+  grub_dprintf ("dl", "    sym_addr = 0x%08x", sym_addr);
+
+  offset += sym_addr;
+#ifndef GRUB_UTIL
+  offset -= (grub_uint32_t) target;
+#endif
+
+  grub_dprintf("dl", " %s: target=%p, sym_addr=0x%08x, offset=%d\n",
+	      is_blx ? "BLX" : "BL", target, sym_addr, offset);
+
+  if ((offset < offset_low) || (offset > offset_high))
+    return grub_error (GRUB_ERR_BAD_MODULE,
+		       N_("THM_CALL Relocation out of range."));
+
+  grub_dprintf ("dl", "    relative destination = 0x%08lx",
+		(unsigned long)target + offset);
+
+  /* Reassemble instruction word */
+  sign = (offset >> 24) & 1;
+  j1 = sign ^ (~(offset >> 23) & 1);
+  j2 = sign ^ (~(offset >> 22) & 1);
+  insword = (insword & insmask) |
+    (sign << 26) |
+    (((offset >> 12) & 0x03ff) << 16) |
+    (j1 << 13) | (j2 << 11) | ((offset >> 1) & 0x07ff);
+
+  /* Write instruction word back in alignment-safe manner */
+  *target = grub_cpu_to_le16 ((insword >> 16) & 0xffff);
+  *(target + 1) = grub_cpu_to_le16 (insword & 0xffff);
+
+  grub_dprintf ("dl", "    *insword = 0x%08x", insword);
+
+  return GRUB_ERR_NONE;
+}
+
+/*
+ * R_ARM_THM_JUMP19
+ *
+ * Relocate conditional Thumb (T32) B<c>.W
+ */
+grub_err_t
+grub_arm_reloc_thm_jump19 (grub_uint16_t *target, Elf32_Addr sym_addr)
+{
+  grub_int32_t offset;
+  grub_uint32_t insword, insmask;
+
+  /* Extract instruction word in alignment-safe manner */
+  insword = grub_le_to_cpu16 ((*target)) << 16
+    | grub_le_to_cpu16 (*(target + 1));
+  insmask = 0xfbc0d000;
+
+  /* Extract and sign extend offset */
+  offset = ((insword >> 26) & 1) << 19
+    | ((insword >> 11) & 1) << 18
+    | ((insword >> 13) & 1) << 17
+    | ((insword >> 16) & 0x3f) << 11
+    | (insword & 0x7ff);
+  offset <<= 1;
+  if (offset & (1 << 20))
+    offset -= (1 << 21);
+
+  /* Adjust and re-truncate offset */
+  offset += sym_addr;
+#ifndef GRUB_UTIL
+  offset -= (grub_uint32_t) target;
+#endif
+  if ((offset > 1048574) || (offset < -1048576))
+    return grub_error (GRUB_ERR_BAD_MODULE,
+		       N_("THM_JUMP19 Relocation out of range."));
+
+  offset >>= 1;
+  offset &= 0xfffff;
+
+  /* Reassemble instruction word and write back */
+  insword &= insmask;
+  insword |= ((offset >> 19) & 1) << 26
+    | ((offset >> 18) & 1) << 11
+    | ((offset >> 17) & 1) << 13
+    | ((offset >> 11) & 0x3f) << 16
+    | (offset & 0x7ff);
+  *target = grub_cpu_to_le16 (insword >> 16);
+  *(target + 1) = grub_cpu_to_le16 (insword & 0xffff);
+  return GRUB_ERR_NONE;
+}
+
+
+
+/***********************************************************
+ * ARM (A32) relocations:                                  *
+ *                                                         *
+ * ARM instructions are 32-bit in size and 32-bit aligned. *
+ ***********************************************************/
+
+/*
+ * R_ARM_JUMP24
+ *
+ * Relocate ARM (A32) B
+ */
+grub_err_t
+grub_arm_reloc_jump24 (grub_uint32_t *target, Elf32_Addr sym_addr)
+{
+  grub_uint32_t insword;
+  grub_int32_t offset;
+
+  if (sym_addr & 1)
+    return grub_error (GRUB_ERR_BAD_MODULE,
+		       N_("Relocation targeting wrong execution state"));
+
+  insword = grub_le_to_cpu32 (*target);
+
+  offset = (insword & 0x00ffffff) << 2;
+  if (offset & 0x02000000)
+    offset -= 0x04000000;
+  offset += sym_addr;
+#ifndef GRUB_UTIL
+  offset -= (grub_uint32_t) target;
+#endif
+
+  insword &= 0xff000000;
+  insword |= (offset >> 2) & 0x00ffffff;
+
+  *target = grub_cpu_to_le32 (insword);
+
+  return GRUB_ERR_NONE;
+}

grub-core/kern/arm/efi/init.c

@@ -0,0 +1,68 @@
+/* init.c - initialize an arm-based EFI system */
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 2013 Free Software Foundation, Inc.
+ *
+ *  GRUB is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  GRUB is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <grub/env.h>
+#include <grub/kernel.h>
+#include <grub/misc.h>
+#include <grub/mm.h>
+#include <grub/time.h>
+#include <grub/efi/efi.h>
+
+/*
+ * A bit ugly, but functional - and should be completely portable.
+ */
+static grub_uint64_t
+grub_efi_get_time_ms(void)
+{
+  grub_efi_time_t now;
+  grub_uint64_t retval;
+  grub_efi_status_t status;
+
+  status = efi_call_2 (grub_efi_system_table->runtime_services->get_time,
+		       &now, NULL);
+  if (status != GRUB_EFI_SUCCESS)
+    {
+      grub_printf("No time!\n");
+      return 0;
+    }
+  retval = now.year * 365 * 24 * 60 * 60 * 1000;
+  retval += now.month * 30 * 24 * 60 * 60 * 1000;
+  retval += now.day * 24 * 60 * 60 * 1000;
+  retval += now.hour * 60 * 60 * 1000;
+  retval += now.minute * 60 * 1000;
+  retval += now.second * 1000;
+  retval += now.nanosecond / 1000;
+ 
+  grub_dprintf("timer", "timestamp: 0x%llx\n", retval);
+
+  return retval;
+}
+
+void
+grub_machine_init (void)
+{
+  grub_efi_init ();
+  grub_install_get_time_ms (grub_efi_get_time_ms);
+}
+
+void
+grub_machine_fini (void)
+{
+  grub_efi_fini ();
+}

grub-core/kern/arm/efi/misc.c

@@ -0,0 +1,203 @@
+/* misc.c - various system functions for an arm-based EFI system */
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 2013 Free Software Foundation, Inc.
+ *
+ *  GRUB is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  GRUB is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <grub/misc.h>
+#include <grub/mm.h>
+#include <grub/cpu/linux.h>
+#include <grub/cpu/system.h>
+#include <grub/efi/efi.h>
+#include <grub/machine/loader.h>
+
+static inline grub_size_t
+page_align (grub_size_t size)
+{
+  return (size + (1 << 12) - 1) & (~((1 << 12) - 1));
+}
+
+/* Find the optimal number of pages for the memory map. Is it better to
+   move this code to efi/mm.c?  */
+static grub_efi_uintn_t
+find_mmap_size (void)
+{
+  static grub_efi_uintn_t mmap_size = 0;
+
+  if (mmap_size != 0)
+    return mmap_size;
+  
+  mmap_size = (1 << 12);
+  while (1)
+    {
+      int ret;
+      grub_efi_memory_descriptor_t *mmap;
+      grub_efi_uintn_t desc_size;
+      
+      mmap = grub_malloc (mmap_size);
+      if (! mmap)
+	return 0;
+
+      ret = grub_efi_get_memory_map (&mmap_size, mmap, 0, &desc_size, 0);
+      grub_free (mmap);
+      
+      if (ret < 0)
+	{
+	  grub_error (GRUB_ERR_IO, "cannot get memory map");
+	  return 0;
+	}
+      else if (ret > 0)
+	break;
+
+      mmap_size += (1 << 12);
+    }
+
+  /* Increase the size a bit for safety, because GRUB allocates more on
+     later, and EFI itself may allocate more.  */
+  mmap_size += (1 << 12);
+
+  return page_align (mmap_size);
+}
+
+#define NEXT_MEMORY_DESCRIPTOR(desc, size)      \
+  ((grub_efi_memory_descriptor_t *) ((char *) (desc) + (size)))
+#define PAGE_SHIFT 12
+
+void *
+grub_efi_allocate_loader_memory (grub_uint32_t min_offset, grub_uint32_t size)
+{
+  grub_efi_uintn_t desc_size;
+  grub_efi_memory_descriptor_t *mmap, *mmap_end;
+  grub_efi_uintn_t mmap_size, tmp_mmap_size;
+  grub_efi_memory_descriptor_t *desc;
+  void *mem = NULL;
+  grub_addr_t min_start = 0;
+
+  mmap_size = find_mmap_size();
+  if (!mmap_size)
+    return NULL;
+
+  mmap = grub_malloc(mmap_size);
+  if (!mmap)
+    return NULL;
+
+  tmp_mmap_size = mmap_size;
+  if (grub_efi_get_memory_map (&tmp_mmap_size, mmap, 0, &desc_size, 0) <= 0)
+    {
+      grub_error (GRUB_ERR_IO, "cannot get memory map");
+      goto fail;
+    }
+
+  mmap_end = NEXT_MEMORY_DESCRIPTOR (mmap, tmp_mmap_size);
+  /* Find lowest accessible RAM location */
+  {
+    int found = 0;
+    for (desc = mmap ; !found && (desc < mmap_end) ;
+	 desc = NEXT_MEMORY_DESCRIPTOR(desc, desc_size))
+      {
+	switch (desc->type)
+	  {
+	  case GRUB_EFI_CONVENTIONAL_MEMORY:
+	  case GRUB_EFI_LOADER_CODE:
+	  case GRUB_EFI_LOADER_DATA:
+	    min_start = desc->physical_start + min_offset;
+	    found = 1;
+	    break;
+	  default:
+	    break;
+	  }
+      }
+  }
+
+  /* First, find free pages for the real mode code
+     and the memory map buffer.  */
+  for (desc = mmap ; desc < mmap_end ;
+       desc = NEXT_MEMORY_DESCRIPTOR(desc, desc_size))
+    {
+      grub_uint64_t start, end;
+
+      grub_dprintf("mm", "%s: 0x%08x bytes @ 0x%08x\n",
+		   __FUNCTION__,
+		   (grub_uint32_t) (desc->num_pages << PAGE_SHIFT),
+		   (grub_uint32_t) (desc->physical_start));
+
+      if (desc->type != GRUB_EFI_CONVENTIONAL_MEMORY)
+	continue;
+
+      start = desc->physical_start;
+      end = start + (desc->num_pages << PAGE_SHIFT);
+      grub_dprintf("mm", "%s: start=0x%016llx, end=0x%016llx\n",
+		  __FUNCTION__, start, end);
+      start = start < min_start ? min_start : start;
+      if (start + size > end)
+	continue;
+      grub_dprintf("mm", "%s: let's allocate some (0x%x) pages @ 0x%08x...\n",
+		  __FUNCTION__, (size >> PAGE_SHIFT), (grub_addr_t) start);
+      mem = grub_efi_allocate_pages (start, (size >> PAGE_SHIFT) + 1);
+      grub_dprintf("mm", "%s: retval=0x%08x\n",
+		   __FUNCTION__, (grub_addr_t) mem);
+      if (! mem)
+	{
+	  grub_error (GRUB_ERR_OUT_OF_MEMORY, "cannot allocate memory");
+	  goto fail;
+	}
+      break;
+    }
+
+  if (! mem)
+    {
+      grub_error (GRUB_ERR_OUT_OF_MEMORY, "cannot allocate memory");
+      goto fail;
+    }
+
+  grub_free (mmap);
+  return mem;
+
+ fail:
+  grub_free (mmap);
+  return NULL;
+}
+
+grub_err_t
+grub_efi_prepare_platform (void)
+{
+  grub_efi_uintn_t mmap_size;
+  grub_efi_uintn_t map_key;
+  grub_efi_uintn_t desc_size;
+  grub_efi_uint32_t desc_version;
+  grub_efi_memory_descriptor_t *mmap_buf;
+  grub_err_t err;
+
+  /*
+   * Cloned from IA64
+   * Must be done after grub_machine_fini because map_key is used by
+   *exit_boot_services.
+   */
+  mmap_size = find_mmap_size ();
+  if (! mmap_size)
+    return GRUB_ERR_OUT_OF_MEMORY;
+  mmap_buf = grub_efi_allocate_pages (0, page_align (mmap_size) >> 12);
+  if (! mmap_buf)
+    return GRUB_ERR_OUT_OF_MEMORY;
+
+  err = grub_efi_finish_boot_services (&mmap_size, mmap_buf, &map_key,
+				       &desc_size, &desc_version);
+  if (err != GRUB_ERR_NONE)
+    return err;
+
+  grub_arm_disable_caches_mmu();
+  return GRUB_ERR_NONE;
+}

grub-core/kern/arm/efi/startup.S

@@ -0,0 +1,38 @@
+/*
+ * (C) Copyright 2013 Free Software Foundation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ *
+ */
+
+#include <grub/symbol.h>
+
+	.file 	"startup.S"
+	.text
+	.arm
+FUNCTION(_start)
+	/*
+	 *  EFI_SYSTEM_TABLE and EFI_HANDLE are passed in r1/r0.
+	 */
+	ldr	ip, =EXT_C(grub_efi_image_handle)
+	str	r0, [ip]
+	ldr	ip, =EXT_C(grub_efi_system_table)
+	str	r1, [ip]
+	ldr	ip, =EXT_C(grub_main)
+	bx	ip
+	.thumb		@ For relocation debugging
+	blx	_start
+	.end

grub-core/kern/arm/misc.S

@@ -0,0 +1,44 @@
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 2013  Free Software Foundation, Inc.
+ *
+ *  GRUB is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  GRUB is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <grub/symbol.h>
+#include <grub/dl.h>
+
+	.file	"misc.S"
+	.text
+	.syntax	unified
+#if !defined (__thumb2__)
+	.arm
+#define ARM(x...)	x
+#define THUMB(x...)
+#else
+	.thumb
+#define THUMB(x...)	x
+#define ARM(x...)
+#endif
+
+	.align	2
+
+/*
+ * Null divide-by-zero handler
+ */
+FUNCTION(raise)
+	mov	r0, #0
+	bx	lr
+	
+	.end

grub-core/kern/arm/uboot/startup.S

@@ -0,0 +1,169 @@
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 2013  Free Software Foundation, Inc.
+ *
+ *  GRUB is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  GRUB is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <grub/offsets.h>
+#include <grub/symbol.h>
+#include <grub/machine/kernel.h>
+
+/*
+ * GRUB is called from U-Boot as a Linux Kernel type image, which
+ * means among other things that it always enters in ARM state.
+ *
+ *
+ * Overview of GRUB image layout:
+ *
+ * _start:
+ *              Entry point (1 ARM branch instruction, to "codestart")
+ * grub_total_module_size:
+ *              Data field: Size of included module blob
+ *              (when generated by grub-mkimage)
+ * codestart:
+ *              Remainder of statically-linked executable code and data.
+ * __bss_start:
+ *              Start of included module blob.
+ *              Also where global/static variables are located.
+ * _end:
+ *              End of bss region (but not necessarily module blob).
+ * <stack>:     
+ * <modules>:
+ *              Loadable modules, post relocation.
+ * <heap>:
+ */
+	
+	.text
+	.arm
+FUNCTION(_start)
+	b	codestart
+	
+	@ Size of final image integrated module blob - set by grub-mkimage
+	. = _start + GRUB_KERNEL_MACHINE_TOTAL_MODULE_SIZE
+VARIABLE(grub_total_module_size)
+	.long 	0
+
+FUNCTION(codestart)
+	@ Store context: Machine ID, atags/dtb, ...
+	@ U-Boot API signature is stored on the U-Boot heap
+	@ Stack pointer used as start address for signature probing
+	mov	r12, sp
+	ldr	sp, =entry_state
+	push	{r4-r12,lr}	@ store U-Boot context (sp in r12)
+
+	ldr     r12, =EXT_C(grub_uboot_machine_type)
+	str     r1, [r12]
+	ldr     r12, =EXT_C(grub_uboot_boot_data)
+	str     r2, [r12]
+
+	@ Modules have been stored as a blob in BSS,
+	@ they need to be manually relocated to _end
+	ldr	r0, =EXT_C(__bss_start)		@ src
+	add	r0, r0, #(GRUB_KERNEL_MACHINE_MOD_ALIGN - 1)
+	mvn	r1, #(GRUB_KERNEL_MACHINE_MOD_ALIGN - 1)
+	and	r0, r0, r1
+
+	ldr	r1, =EXT_C(_end)		@ dst = End of BSS
+	ldr	r2, grub_total_module_size	@ blob size
+
+	add     r1, r1, #GRUB_KERNEL_MACHINE_STACK_SIZE
+	and	r1, r1, #~0x7	@ Ensure 8-byte alignment
+	sub	sp, r1, #8
+	add     r1, r1, #1024
+
+	ldr     r12, =EXT_C(grub_modbase)
+	str     r1, [r12]
+
+	add	r1, r1, r2
+	add	r0, r0, r2
+	sub     r1, r1, #4
+	sub     r0, r0, #4
+
+1:	ldr	r3, [r0], #-4 			@ r3 = *src--
+	str	r3, [r1], #-4			@ *dst-- = r3 
+	subs	r2, #4				@ remaining -= 4
+	bne	1b				@ while remaining != 0
+
+	@ Since we _are_ the C run-time, we need to manually zero the BSS
+	@ region before continuing
+	ldr	r0, =EXT_C(__bss_start)	@ zero from here
+	@ If unaligned, bytewise zero until base address aligned.
+	mov	r2, #0
+1:	tst	r0, #3
+	beq	2f
+	strb	r2, [r0], #1
+	b	1b
+2:	ldr	r1, =EXT_C(_end)		@ to here
+1:	str	r2, [r0], #4
+	cmp	r0, r1
+	bne	1b
+	
+	b	EXT_C(grub_main)
+
+	/*
+	 * uboot_syscall():
+	 *   This function is effectively a veneer, so it cannot
+	 *   modify the stack or corrupt any registers other than
+	 *   r12 (ip). Furthermore it needs to restore r8 for
+	 *   U-Boot (Global Data Pointer) and preserve it for Grub.
+	 */
+FUNCTION(grub_uboot_syscall)
+	ldr	ip, =transition_space
+	stm	ip, {r8, lr}
+	ldr	ip, =gd_backup
+	ldr	r8, [ip]
+	ldr	ip, =grub_uboot_syscall_ptr
+	mov	lr, pc
+	ldr	pc, [ip]
+	ldr	ip, =gd_backup
+	str	r8, [ip]
+	ldr	ip, =transition_space
+	ldm	ip, {r8, lr}
+	bx	lr
+	
+FUNCTION(grub_uboot_return)
+	ldr	sp, =entry_state_end
+	pop	{r4-r12, lr}
+	mov	sp, r12
+	bx	lr
+
+	
+	.data
+	.align	3	@ 8-byte alignment for stack
+@ U-boot context stack space
+entry_state_end:	
+	.long	0	@ r4
+	.long	0	@ r5
+	.long	0	@ r6
+	.long	0	@ r7
+gd_backup:	
+	.long	0	@ r8 - U-Boot global data pointer
+	.long	0	@ r9
+	.long	0	@ r10
+	.long	0	@ r11
+VARIABLE(grub_uboot_search_hint)@ U-Boot stack pointer - 
+	.long	0	@ also API signature address hint.
+	.long	0	@ lr
+entry_state:		@ backup for U-Boot context
+
+@ GRUB context stack space
+transition_space:	
+	.long	0	@ r8
+	.long	0	@ lr
+
+VARIABLE(grub_uboot_syscall_ptr)
+	.long	0	@
+
+	.end

grub-core/kern/uboot/hw.c

@@ -0,0 +1,112 @@
+/* hw.c - U-Boot hardware discovery */
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 2013  Free Software Foundation, Inc.
+ *
+ *  GRUB is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  GRUB is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <grub/kernel.h>
+#include <grub/memory.h>
+#include <grub/misc.h>
+#include <grub/mm.h>
+#include <grub/offsets.h>
+#include <grub/machine/kernel.h>
+#include <grub/uboot/disk.h>
+#include <grub/uboot/uboot.h>
+#include <grub/uboot/api_public.h>
+
+grub_addr_t start_of_ram;
+
+/*
+ * grub_uboot_probe_memory():
+ *   Queries U-Boot for available memory regions.
+ *
+ *   Sets up heap near the image in memory and sets up "start_of_ram".
+ */
+void
+grub_uboot_mm_init (void)
+{
+  struct sys_info *si = grub_uboot_get_sys_info ();
+
+  grub_mm_init_region ((void *) grub_modules_get_end (),
+		       GRUB_KERNEL_MACHINE_HEAP_SIZE);
+
+  if (si && (si->mr_no != 0))
+    {
+      int i;
+      start_of_ram = GRUB_UINT_MAX;
+
+      for (i = 0; i < si->mr_no; i++)
+	if ((si->mr[i].flags & MR_ATTR_MASK) == MR_ATTR_DRAM)
+	  if (si->mr[i].start < start_of_ram)
+	    start_of_ram = si->mr[i].start;
+    }
+}
+
+/*
+ * grub_uboot_probe_hardware():
+ */
+grub_err_t
+grub_uboot_probe_hardware (void)
+{
+  int devcount, i;
+
+  devcount = grub_uboot_dev_enum ();
+  grub_dprintf ("init", "%d devices found\n", devcount);
+
+  for (i = 0; i < devcount; i++)
+    {
+      struct device_info *devinfo = grub_uboot_dev_get (i);
+
+      grub_dprintf ("init", "device handle: %d\n", i);
+      grub_dprintf ("init", "  cookie\t= 0x%08x\n",
+		    (grub_uint32_t) devinfo->cookie);
+
+      if (devinfo->type & DEV_TYP_STOR)
+	{
+	  grub_dprintf ("init", "  type\t\t= DISK\n");
+	  grub_ubootdisk_register (devinfo);
+	}
+      else if (devinfo->type & DEV_TYP_NET)
+	{
+	  /* Dealt with in ubootnet module. */
+	  grub_dprintf ("init", "  type\t\t= NET (not supported yet)\n");
+	}
+      else
+	{
+	  grub_dprintf ("init", "%s: unknown device type", __FUNCTION__);
+	}
+    }
+
+  return GRUB_ERR_NONE;
+}
+
+grub_err_t
+grub_machine_mmap_iterate (grub_memory_hook_t hook, void *hook_data)
+{
+  int i;
+  struct sys_info *si = grub_uboot_get_sys_info ();
+
+  if (!si || (si->mr_no < 1))
+    return GRUB_ERR_BUG;
+
+  /* Iterate and call `hook'.  */
+  for (i = 0; i < si->mr_no; i++)
+    if ((si->mr[i].flags & MR_ATTR_MASK) == MR_ATTR_DRAM)
+      hook (si->mr[i].start, si->mr[i].size, GRUB_MEMORY_AVAILABLE,
+	    hook_data);
+
+  return GRUB_ERR_NONE;
+}

grub-core/kern/uboot/init.c

@@ -0,0 +1,157 @@
+/* init.c - generic U-Boot initialization and finalization */
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 2013  Free Software Foundation, Inc.
+ *
+ *  GRUB is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  GRUB is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+
+#include <grub/env.h>
+#include <grub/kernel.h>
+#include <grub/misc.h>
+#include <grub/mm.h>
+#include <grub/offsets.h>
+#include <grub/term.h>
+#include <grub/time.h>
+#include <grub/machine/kernel.h>
+#include <grub/uboot/console.h>
+#include <grub/uboot/disk.h>
+#include <grub/uboot/uboot.h>
+#include <grub/uboot/api_public.h>
+
+extern char __bss_start[];
+extern char _end[];
+extern grub_size_t grub_total_module_size;
+extern int (*grub_uboot_syscall_ptr) (int, int *, ...);
+
+/* Set to anything other than zero so it lands in .data and not .bss.  */
+grub_addr_t grub_modbase = 0x55aa55aa;
+grub_uint32_t grub_uboot_machine_type = 0x55aa55aa;
+grub_addr_t grub_uboot_boot_data = 0x55aa55aa;
+
+static unsigned long timer_start;
+
+void
+grub_exit (void)
+{
+  grub_uboot_return (0);
+}
+
+grub_uint32_t
+grub_uboot_get_machine_type (void)
+{
+  return grub_uboot_machine_type;
+}
+
+grub_addr_t
+grub_uboot_get_boot_data (void)
+{
+  return grub_uboot_boot_data;
+}
+
+static grub_uint64_t
+uboot_timer_ms (void)
+{
+  return (grub_uint64_t) grub_uboot_get_timer (timer_start) / 1000;
+}
+
+void
+grub_machine_init (void)
+{
+  int ver;
+
+  /* First of all - establish connection with U-Boot */
+  ver = grub_uboot_api_init ();
+  if (!ver)
+    {
+      /* Don't even have a console to log errors to... */
+      grub_exit ();
+    }
+  else if (ver > API_SIG_VERSION)
+    {
+      /* Try to print an error message */
+      grub_uboot_puts ("invalid U-Boot API version\n");
+    }
+
+  /* Initialize the console so that GRUB can display messages.  */
+  grub_console_init_early ();
+
+  /* Enumerate memory and initialize the memory management system. */
+  grub_uboot_mm_init ();
+
+  grub_dprintf ("init", "__bss_start: %p\n", __bss_start);
+  grub_dprintf ("init", "_end: %p\n", _end);
+  grub_dprintf ("init", "grub_modbase: %p\n", (void *) grub_modbase);
+  grub_dprintf ("init", "grub_modules_get_end(): %p\n",
+		(void *) grub_modules_get_end ());
+
+  /* Initialise full terminfo support */
+  grub_console_init_lately ();
+
+  /* Enumerate uboot devices */
+  grub_uboot_probe_hardware ();
+
+  /* Initialise timer */
+  timer_start = grub_uboot_get_timer (0);
+  grub_install_get_time_ms (uboot_timer_ms);
+
+  /* Initialize  */
+  grub_ubootdisk_init ();
+}
+
+
+void
+grub_machine_fini (void)
+{
+}
+
+/*
+ * grub_machine_get_bootlocation():
+ *   Called from kern/main.c, which expects a device name (minus parentheses)
+ *   and a filesystem path back, if any are known.
+ *   Any returned values must be pointers to dynamically allocated strings.
+ */
+void
+grub_machine_get_bootlocation (char **device, char **path)
+{
+  char *tmp;
+
+  tmp = grub_uboot_env_get ("grub_bootdev");
+  if (tmp)
+    {
+      *device = grub_strdup (tmp);
+      if (*device == NULL)
+	return;
+    }
+  else
+    *device = NULL;
+
+  tmp = grub_uboot_env_get ("grub_bootpath");
+  if (tmp)
+    {
+      *path = grub_strdup (tmp);
+      if (*path == NULL)
+	return;
+    }
+  else
+    *path = NULL;
+}
+
+void
+grub_uboot_fini (void)
+{
+  grub_ubootdisk_fini ();
+  grub_console_fini ();
+}

grub-core/kern/uboot/uboot.c

@@ -0,0 +1,326 @@
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 2013  Free Software Foundation, Inc.
+ *
+ *  GRUB is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  GRUB is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <grub/misc.h>
+#include <grub/mm.h>
+#include <grub/uboot/api_public.h>
+#include <grub/uboot/uboot.h>
+
+/*
+ * The main syscall entry point is not reentrant, only one call is
+ * serviced until finished.
+ *
+ * int syscall(int call, int *retval, ...)
+ * e.g. syscall(1, int *, u_int32_t, u_int32_t, u_int32_t, u_int32_t);
+ *
+ * call:	syscall number
+ *
+ * retval:	points to the return value placeholder, this is the place the
+ *		syscall puts its return value, if NULL the caller does not
+ *		expect a return value
+ *
+ * ...		syscall arguments (variable number)
+ *
+ * returns:	0 if the call not found, 1 if serviced
+ */
+
+extern int (*grub_uboot_syscall_ptr) (int, int *, ...);
+extern int grub_uboot_syscall (int, int *, ...);
+extern grub_addr_t grub_uboot_search_hint;
+
+static struct sys_info uboot_sys_info;
+static struct mem_region uboot_mem_info[5];
+static struct device_info * devices;
+static int num_devices;
+
+int
+grub_uboot_api_init (void)
+{
+  struct api_signature *start, *end;
+  struct api_signature *p;
+
+  if (grub_uboot_search_hint)
+    {
+      /* Extended search range to work around Trim Slice U-Boot issue */
+      start = (struct api_signature *) ((grub_uboot_search_hint & ~0x000fffff)
+					- 0x00500000);
+      end =
+	(struct api_signature *) ((grub_addr_t) start + UBOOT_API_SEARCH_LEN -
+				  API_SIG_MAGLEN + 0x00500000);
+    }
+  else
+    {
+      start = 0;
+      end = (struct api_signature *) (256 * 1024 * 1024);
+    }
+
+  /* Structure alignment is (at least) 8 bytes */
+  for (p = start; p < end; p = (void *) ((grub_addr_t) p + 8))
+    {
+      if (grub_memcmp (&(p->magic), API_SIG_MAGIC, API_SIG_MAGLEN) == 0)
+	{
+	  grub_uboot_syscall_ptr = p->syscall;
+	  return p->version;
+	}
+    }
+
+  return 0;
+}
+
+/*
+ * All functions below are wrappers around the grub_uboot_syscall() function
+ */
+
+int
+grub_uboot_getc (void)
+{
+  int c;
+  if (!grub_uboot_syscall (API_GETC, NULL, &c))
+    return -1;
+
+  return c;
+}
+
+int
+grub_uboot_tstc (void)
+{
+  int c;
+  if (!grub_uboot_syscall (API_TSTC, NULL, &c))
+    return -1;
+
+  return c;
+}
+
+void
+grub_uboot_putc (int c)
+{
+  grub_uboot_syscall (API_PUTC, NULL, &c);
+}
+
+void
+grub_uboot_puts (const char *s)
+{
+  grub_uboot_syscall (API_PUTS, NULL, s);
+}
+
+void
+grub_uboot_reset (void)
+{
+  grub_uboot_syscall (API_RESET, NULL, 0);
+}
+
+struct sys_info *
+grub_uboot_get_sys_info (void)
+{
+  int retval;
+
+  grub_memset (&uboot_sys_info, 0, sizeof (uboot_sys_info));
+  grub_memset (&uboot_mem_info, 0, sizeof (uboot_mem_info));
+  uboot_sys_info.mr = uboot_mem_info;
+  uboot_sys_info.mr_no = sizeof (uboot_mem_info) / sizeof (struct mem_region);
+
+  if (grub_uboot_syscall (API_GET_SYS_INFO, &retval, &uboot_sys_info))
+    if (retval == 0)
+      return &uboot_sys_info;
+
+  return NULL;
+}
+
+void
+grub_uboot_udelay (grub_uint32_t usec)
+{
+  grub_uboot_syscall (API_UDELAY, NULL, &usec);
+}
+
+grub_uint32_t
+grub_uboot_get_timer (grub_uint32_t base)
+{
+  grub_uint32_t current;
+
+  if (!grub_uboot_syscall (API_GET_TIMER, NULL, &current, &base))
+    return 0;
+
+  return current;
+}
+
+int
+grub_uboot_dev_enum (void)
+{
+  struct device_info * enum_devices;
+  int num_enum_devices, max_devices;
+
+  if (num_devices)
+    return num_devices;
+
+  max_devices = 2;
+  enum_devices = grub_malloc (sizeof(struct device_info) * max_devices);
+  if (!enum_devices)
+    return 0;
+
+  /*
+   * The API_DEV_ENUM call starts a fresh enumeration when passed a
+   * struct device_info with a NULL cookie, and then depends on having
+   * the previously enumerated device cookie "seeded" into the target
+   * structure.
+   */
+
+  enum_devices[0].cookie = NULL;
+  num_enum_devices = 0;
+
+  if (grub_uboot_syscall (API_DEV_ENUM, NULL,
+			  &enum_devices[num_enum_devices]) == 0)
+    goto error;
+
+  num_enum_devices++;
+
+  while (enum_devices[num_enum_devices - 1].cookie != NULL)
+    {
+      if (num_enum_devices == max_devices)
+	{
+	  struct device_info *tmp;
+	  int new_max;
+	  new_max = max_devices * 2;
+	  tmp = grub_realloc (enum_devices,
+			      sizeof (struct device_info) * new_max);
+	  if (!tmp)
+	    {
+	      /* Failed to realloc, so return what we have */
+	      break;
+	    }
+	  enum_devices = tmp;
+	  max_devices = new_max;
+	}
+
+      enum_devices[num_enum_devices].cookie =
+	enum_devices[num_enum_devices - 1].cookie;
+      if (grub_uboot_syscall (API_DEV_ENUM, NULL,
+			      &enum_devices[num_enum_devices]) == 0)
+	goto error;
+
+      if (enum_devices[num_enum_devices].cookie == NULL)
+	break;
+
+      num_enum_devices++;
+    }
+
+  devices = enum_devices;
+  return num_devices = num_enum_devices;
+
+ error:
+  grub_free (enum_devices);
+  return 0;
+}
+
+#define VALID_DEV(x) (((x) < num_devices) && ((x) >= 0))
+#define OPEN_DEV(x) ((x->state == DEV_STA_OPEN))
+
+struct device_info *
+grub_uboot_dev_get (int index)
+{
+  if (VALID_DEV (index))
+    return &devices[index];
+
+  return NULL;
+}
+
+
+int
+grub_uboot_dev_open (struct device_info *dev)
+{
+  int retval;
+
+  if (!grub_uboot_syscall (API_DEV_OPEN, &retval, dev))
+    return -1;
+
+  return retval;
+}
+
+int
+grub_uboot_dev_close (struct device_info *dev)
+{
+  int retval;
+
+  if (!grub_uboot_syscall (API_DEV_CLOSE, &retval, dev))
+    return -1;
+
+  return retval;
+}
+
+
+int
+grub_uboot_dev_read (struct device_info *dev, void *buf, grub_size_t blocks,
+		     grub_uint32_t start, grub_size_t * real_blocks)
+{
+  int retval;
+
+  if (!OPEN_DEV (dev))
+    return -1;
+
+  if (!grub_uboot_syscall (API_DEV_READ, &retval, dev, buf,
+			   &blocks, &start, real_blocks))
+    return -1;
+
+  return retval;
+}
+
+int
+grub_uboot_dev_recv (struct device_info *dev, void *buf,
+		     int size, int *real_size)
+{
+  int retval;
+
+  if (!OPEN_DEV (dev))
+    return -1;
+
+  if (!grub_uboot_syscall (API_DEV_READ, &retval, dev, buf, &size, real_size))
+    return -1;
+
+  return retval;
+
+}
+
+int
+grub_uboot_dev_send (struct device_info *dev, void *buf, int size)
+{
+  int retval;
+
+  if (!OPEN_DEV (dev))
+    return -1;
+
+  if (!grub_uboot_syscall (API_DEV_WRITE, &retval, dev, buf, &size))
+    return -1;
+
+  return retval;
+}
+
+char *
+grub_uboot_env_get (const char *name)
+{
+  char *value;
+
+  if (!grub_uboot_syscall (API_ENV_GET, NULL, name, &value))
+    return NULL;
+
+  return value;
+}
+
+void
+grub_uboot_env_set (const char *name, const char *value)
+{
+  grub_uboot_syscall (API_ENV_SET, NULL, name, value);
+}

grub-core/lib/arm/setjmp.S

@@ -0,0 +1,42 @@
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 2013  Free Software Foundation, Inc.
+ *
+ *  GRUB is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  GRUB is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <grub/symbol.h>
+
+	.file	"setjmp.S"
+	.syntax	unified
+	.arm
+
+	.text
+
+/*
+ * int grub_setjmp (grub_jmp_buf env)
+ */
+FUNCTION(grub_setjmp)
+	stm	r0, { r4-r11, sp, lr }
+	mov	r0, #0
+	bx	lr
+
+/*
+ * int grub_longjmp (grub_jmp_buf env, int val)
+ */
+FUNCTION(grub_longjmp)
+ 	ldm	r0, { r4-r11, sp, lr }
+	movs	r0, r1
+	moveq	r0, #1
+	bx	lr

grub-core/lib/efi/halt.c

@@ -28,7 +28,7 @@ void
 grub_halt (void)
 {
   grub_machine_fini ();
-#ifndef __ia64__
+#if !defined(__ia64__) && !defined(__arm__)
   grub_acpi_halt ();
 #endif
   efi_call_4 (grub_efi_system_table->runtime_services->reset_system,

grub-core/lib/fdt.c

@@ -0,0 +1,389 @@
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 2013  Free Software Foundation, Inc.
+ *
+ *  GRUB is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  GRUB is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <grub/fdt.h>
+#include <grub/misc.h>
+#include <grub/mm.h>
+
+#define FDT_SUPPORTED_VERSION	17
+
+#define FDT_BEGIN_NODE	0x00000001
+#define FDT_END_NODE	0x00000002
+#define FDT_PROP	0x00000003
+#define FDT_NOP		0x00000004
+#define FDT_END		0x00000009
+
+#define struct_end(fdt)	\
+	((grub_addr_t) fdt + grub_fdt_get_off_dt_struct(fdt)	\
+	 + grub_fdt_get_size_dt_struct(fdt))
+
+/* Size needed by a node entry: 2 tokens (FDT_BEGIN_NODE and FDT_END_NODE), plus
+   the NULL-terminated string containing the name, plus padding if needed. */
+#define node_entry_size(node_name)	\
+	(2 * sizeof(grub_uint32_t)	\
+	+ ALIGN_UP (grub_strlen (name) + 1, sizeof(grub_uint32_t)))
+
+/* Size needed by a property entry: 1 token (FDT_PROPERTY), plus len and nameoff
+   fields, plus the property value, plus padding if needed. */
+#define prop_entry_size(prop_len)	\
+	(3 * sizeof(grub_uint32_t) + ALIGN_UP(prop_len, sizeof(grub_uint32_t)))
+
+static grub_uint32_t *get_next_node (const void *fdt, char *node_name)
+{
+  grub_uint32_t *end = (void *) struct_end (fdt);
+  grub_uint32_t *token;
+
+  if (node_name >= (char *) end)
+    return NULL;
+  while (*node_name)
+  {
+    if (++node_name >= (char *) end)
+  	  return NULL;
+  }
+  token = (grub_uint32_t *) ALIGN_UP ((grub_addr_t) node_name, 4);
+  while (token < end)
+  {
+    switch (grub_be_to_cpu32(*token))
+    {
+      case FDT_BEGIN_NODE:
+        token = get_next_node (fdt, (char *) (token + 1));
+        if (!token)
+          return NULL;
+        break;
+      case FDT_END_NODE:
+        token++;
+        if (token >= end)
+          return NULL;
+        return token;
+      case FDT_PROP:
+        /* Skip property token and following data (len, nameoff and property
+           value). */
+        token += 3 + grub_be_to_cpu32 (*(token + 1));
+        break;
+      case FDT_NOP:
+        token++;
+        break;
+      default:
+        return NULL;
+    }
+  }
+  return NULL;
+}
+
+static int get_mem_rsvmap_size (const void *fdt)
+{
+  int size = 0;
+  grub_uint64_t *ptr = (void *) ((grub_addr_t) fdt
+                                 + grub_fdt_get_off_mem_rsvmap (fdt));
+
+  do
+  {
+    size += 2 * sizeof(*ptr);
+    if (!*ptr && !*(ptr + 1))
+      return size;
+    ptr += 2;
+  } while ((grub_addr_t) ptr <= (grub_addr_t) fdt + grub_fdt_get_totalsize (fdt)
+                                  - 2 * sizeof(grub_uint64_t));
+  return -1;
+}
+
+static grub_uint32_t get_free_space (void *fdt)
+{
+  int mem_rsvmap_size = get_mem_rsvmap_size (fdt);
+
+  if (mem_rsvmap_size < 0)
+    /* invalid memory reservation block */
+    return 0;
+  return (grub_fdt_get_totalsize (fdt) - sizeof(grub_fdt_header_t)
+          - mem_rsvmap_size - grub_fdt_get_size_dt_strings (fdt)
+          - grub_fdt_get_size_dt_struct (fdt));
+}
+
+static int add_subnode (void *fdt, int parentoffset, const char *name)
+{
+  grub_uint32_t *begin = (void *) ((grub_addr_t) fdt
+                                   + grub_fdt_get_off_dt_struct(fdt)
+                                   + parentoffset);
+  grub_uint32_t *end = (void *) struct_end (fdt);
+  unsigned int entry_size = node_entry_size (name);
+  grub_uint32_t *token = begin;
+
+  /* Insert the new subnode just after the properties of the parent node (if
+     any).*/
+  while (1)
+  {
+    if (token >= end)
+      return -1;
+    switch (grub_be_to_cpu32(*token))
+    {
+      case FDT_PROP:
+        /* Skip len and nameoff. */
+        token += 2;
+        break;
+      case FDT_BEGIN_NODE:
+      case FDT_END_NODE:
+        goto insert;
+      case FDT_NOP:
+        break;
+      default:
+        /* invalid token */
+        return -1;
+    }
+    token++;
+  }
+insert:
+  grub_memmove (token + entry_size, token,
+                (grub_addr_t) end - (grub_addr_t) token);
+  *token = grub_cpu_to_be32(FDT_BEGIN_NODE);
+  token[entry_size / sizeof(*token) - 2] = 0;	/* padding bytes */
+  grub_strcpy((char *) (token + 1), name);
+  token += entry_size / sizeof(*token) - 1;
+  *token = grub_cpu_to_be32(FDT_END_NODE);
+  return ((grub_addr_t) token - (grub_addr_t) fdt
+          - grub_fdt_get_off_dt_struct(fdt));
+}
+
+/* Rearrange FDT blocks in the canonical order: first the memory reservation
+   block (just after the FDT header), then the structure block and finally the
+   strings block. No free space is left between the first and the second block,
+   while the space between the second and the third block is given by the
+   clearance argument. */
+static int rearrange_blocks (void *fdt, unsigned int clearance)
+{
+  grub_uint32_t off_mem_rsvmap = ALIGN_UP(sizeof(grub_fdt_header_t), 8);
+  grub_uint32_t off_dt_struct = off_mem_rsvmap + get_mem_rsvmap_size (fdt);
+  grub_uint32_t off_dt_strings = off_dt_struct
+                                 + grub_fdt_get_size_dt_struct (fdt)
+                                 + clearance;
+  grub_uint8_t *fdt_ptr = fdt;
+  grub_uint8_t *tmp_fdt;
+
+  if ((grub_fdt_get_off_mem_rsvmap (fdt) == off_mem_rsvmap)
+      && (grub_fdt_get_off_dt_struct (fdt) == off_dt_struct))
+  {
+    /* No need to allocate memory for a temporary FDT, just move the strings
+       block if needed. */
+    if (grub_fdt_get_off_dt_strings (fdt) != off_dt_strings)
+      grub_memmove(fdt_ptr + off_dt_strings,
+                   fdt_ptr + grub_fdt_get_off_dt_strings (fdt),
+                   grub_fdt_get_size_dt_strings (fdt));
+    return 0;
+  }
+  tmp_fdt = grub_malloc (grub_fdt_get_totalsize (fdt));
+  if (!tmp_fdt)
+    return -1;
+  grub_memcpy (tmp_fdt + off_mem_rsvmap,
+              fdt_ptr + grub_fdt_get_off_mem_rsvmap (fdt),
+              get_mem_rsvmap_size (fdt));
+  grub_fdt_set_off_mem_rsvmap (fdt, off_mem_rsvmap);
+  grub_memcpy (tmp_fdt + off_dt_struct,
+              fdt_ptr + grub_fdt_get_off_dt_struct (fdt),
+              grub_fdt_get_size_dt_struct (fdt));
+  grub_fdt_set_off_dt_struct (fdt, off_dt_struct);
+  grub_memcpy (tmp_fdt + off_dt_strings,
+              fdt_ptr + grub_fdt_get_off_dt_strings (fdt),
+              grub_fdt_get_size_dt_strings (fdt));
+  grub_fdt_set_off_dt_strings (fdt, off_dt_strings);
+
+  /* Copy reordered blocks back to fdt. */
+  memcpy (fdt_ptr + off_mem_rsvmap, tmp_fdt + off_mem_rsvmap,
+         grub_fdt_get_totalsize (fdt) - off_mem_rsvmap);
+
+  grub_free(tmp_fdt);
+  return 0;
+}
+
+static grub_uint32_t *find_prop (void *fdt, unsigned int nodeoffset,
+				 const char *name)
+{
+  grub_uint32_t *prop = (void *) ((grub_addr_t) fdt
+                                 + grub_fdt_get_off_dt_struct (fdt)
+                                 + nodeoffset);
+  grub_uint32_t nameoff;
+
+  do
+  {
+    if (grub_be_to_cpu32(*prop) == FDT_PROP)
+      {
+        nameoff = grub_be_to_cpu32(*(prop + 2));
+        if ((nameoff + grub_strlen (name) < grub_fdt_get_size_dt_strings (fdt))
+            && !grub_strcmp (name, (char *) fdt +
+                             grub_fdt_get_off_dt_strings (fdt) + nameoff))
+        	return prop;
+        prop += prop_entry_size(grub_be_to_cpu32(*prop + 1)) / sizeof (*prop);
+      }
+    else if (grub_be_to_cpu32(*prop) != FDT_NOP)
+      return NULL;
+    prop++;
+  } while ((grub_addr_t) prop < ((grub_addr_t) fdt
+                                 + grub_fdt_get_off_dt_struct (fdt)
+                                 + grub_fdt_get_size_dt_struct (fdt)));
+  return NULL;
+}
+
+/* Check the FDT header for consistency and adjust the totalsize field to match
+   the size allocated for the FDT; if this function is called before the other
+   functions in this file and returns success, the other functions are
+   guaranteed not to access memory locations outside the allocated memory. */
+int grub_fdt_check_header (void *fdt, unsigned int size)
+{
+  if (((grub_addr_t) fdt & 0x7) || (grub_fdt_get_magic (fdt) != FDT_MAGIC)
+      || (grub_fdt_get_totalsize (fdt) > size)
+      || (grub_fdt_get_version (fdt) < FDT_SUPPORTED_VERSION)
+      || (grub_fdt_get_last_comp_version (fdt) > FDT_SUPPORTED_VERSION)
+      || (grub_fdt_get_off_dt_struct (fdt) & 0x00000003)
+      || (grub_fdt_get_size_dt_struct (fdt) & 0x00000003)
+      || (grub_fdt_get_off_dt_struct (fdt) + grub_fdt_get_size_dt_struct (fdt)
+          > grub_fdt_get_totalsize (fdt))
+      || (grub_fdt_get_off_dt_strings (fdt) + grub_fdt_get_size_dt_strings (fdt)
+          > grub_fdt_get_totalsize (fdt))
+      || (grub_fdt_get_off_mem_rsvmap (fdt) & 0x00000007)
+      || (grub_fdt_get_off_mem_rsvmap (fdt)
+          > grub_fdt_get_totalsize (fdt) - 2 * sizeof(grub_uint64_t)))
+    return -1;
+  return 0;
+}
+
+/* Find a direct sub-node of a given parent node. */
+int grub_fdt_find_subnode (const void *fdt, unsigned int parentoffset,
+			   const char *name)
+{
+  grub_uint32_t *token, *end;
+  char *node_name;
+
+  if (parentoffset & 0x3)
+    return -1;
+  token = (void *) ((grub_addr_t) fdt + grub_fdt_get_off_dt_struct(fdt)
+                    + parentoffset);
+  end = (void *) struct_end (fdt);
+  while (token < end)
+  {
+    switch (grub_be_to_cpu32(*token))
+    {
+      case FDT_BEGIN_NODE:
+        node_name = (char *) (token + 1);
+        if (node_name + grub_strlen (name) >= (char *) end)
+          return -1;
+        if (!grub_strcmp (node_name, name))
+          return (int) ((grub_addr_t) token
+                        + ALIGN_UP(grub_strlen (name) + 1, 4)
+                        - grub_fdt_get_off_dt_struct (fdt));
+        token = get_next_node (fdt, node_name);
+        if (!token)
+          return -1;
+        break;
+      case FDT_END_NODE:
+        return -1;
+      case FDT_PROP:
+        /* Skip property token and following data (len, nameoff and property
+           value). */
+        token += 3 + grub_be_to_cpu32 (*(token + 1));
+        break;
+      case FDT_NOP:
+        token++;
+        break;
+      default:
+        return -1;
+    }
+  }
+  return -1;
+}
+
+int grub_fdt_add_subnode (void *fdt, unsigned int parentoffset,
+			  const char *name)
+{
+  unsigned int entry_size = node_entry_size(name);
+
+  if ((parentoffset & 0x3) || (get_free_space (fdt) < entry_size))
+    return -1;
+
+  /* The new node entry will increase the size of the structure block: rearrange
+     blocks such that there is sufficient free space between the structure and
+     the strings block, then add the new node entry. */
+  if (rearrange_blocks (fdt, entry_size) < 0)
+    return -1;
+  return add_subnode (fdt, parentoffset, name);
+}
+
+int grub_fdt_set_prop (void *fdt, unsigned int nodeoffset, const char *name,
+		       const void *val, grub_uint32_t len)
+{
+  grub_uint32_t *prop;
+  int prop_name_present = 0;
+  grub_uint32_t nameoff = 0;
+
+  if ((nodeoffset >= grub_fdt_get_size_dt_struct (fdt)) || (nodeoffset & 0x3))
+    return -1;
+  prop = find_prop (fdt, nodeoffset, name);
+  if (prop)
+    {
+	  grub_uint32_t prop_len = ALIGN_UP(grub_be_to_cpu32 (*(prop + 1)),
+                                        sizeof(grub_uint32_t));
+	  grub_uint32_t i;
+
+      prop_name_present = 1;
+	  for (i = 0; i < prop_len / sizeof(grub_uint32_t); i++)
+        *(prop + 3 + i) = grub_cpu_to_be32 (FDT_NOP);
+      if (len > prop_len)
+        {
+          /* Length of new property value is greater than the space allocated
+             for the current value: a new entry needs to be created, so save the
+             nameoff field of the current entry and replace the current entry
+             with NOP tokens. */
+          nameoff = grub_be_to_cpu32 (*(prop + 2));
+    	  *prop = *(prop + 1) = *(prop + 2) = grub_cpu_to_be32 (FDT_NOP);
+          prop = NULL;
+        }
+    }
+  if (!prop || !prop_name_present) {
+    unsigned int needed_space = 0;
+
+    if (!prop)
+      needed_space = prop_entry_size(len);
+    if (!prop_name_present)
+      needed_space += grub_strlen (name) + 1;
+    if (needed_space > get_free_space (fdt))
+      return -1;
+    if (rearrange_blocks (fdt, !prop ? prop_entry_size(len) : 0) < 0)
+      return -1;
+  }
+  if (!prop_name_present) {
+    /* Append the property name at the end of the strings block. */
+    nameoff = grub_fdt_get_size_dt_strings (fdt);
+    grub_strcpy ((char *) fdt + grub_fdt_get_off_dt_strings (fdt) + nameoff,
+                 name);
+    grub_fdt_set_size_dt_strings (fdt, grub_fdt_get_size_dt_strings (fdt)
+                                  + grub_strlen (name) + 1);
+  }
+  if (!prop) {
+    prop = (void *) ((grub_addr_t) fdt + grub_fdt_get_off_dt_struct (fdt)
+                     + nodeoffset);
+    grub_memmove (prop + prop_entry_size(len), prop,
+                  grub_fdt_get_size_dt_struct (fdt) - nodeoffset);
+    *prop = grub_cpu_to_be32 (FDT_PROP);
+    *(prop + 1) = grub_cpu_to_be32 (len);
+    *(prop + 2) = grub_cpu_to_be32 (nameoff);
+
+    /* Insert padding bytes at the end of the value; if they are not needed,
+      they will be overwritten by the follozing memcpy. */
+    *(prop + prop_entry_size(len) / sizeof(grub_uint32_t) - 1) = 0;
+
+    grub_memcpy (prop + 3, val, len);
+  }
+  return 0;
+}

grub-core/lib/setjmp.S

@@ -11,6 +11,8 @@
 #elif defined(__ia64__)
 #include "./ia64/setjmp.S"
 #include "./ia64/longjmp.S"
+#elif defined(__arm__)
+#include "./arm/setjmp.S"
 #else
 #error "Unknown target cpu type"
 #endif

grub-core/lib/uboot/datetime.c

@@ -0,0 +1,41 @@
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 2013  Free Software Foundation, Inc.
+ *
+ *  GRUB is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  GRUB is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <grub/types.h>
+#include <grub/symbol.h>
+#include <grub/uboot/uboot.h>
+#include <grub/datetime.h>
+#include <grub/dl.h>
+
+GRUB_MOD_LICENSE ("GPLv3+");
+
+/* No simple platform-independent RTC access exists in U-Boot. */
+
+grub_err_t
+grub_get_datetime (struct grub_datetime *datetime __attribute__ ((unused)))
+{
+  return grub_error (GRUB_ERR_INVALID_COMMAND,
+		     "can\'t get datetime using U-Boot");
+}
+
+grub_err_t
+grub_set_datetime (struct grub_datetime * datetime __attribute__ ((unused)))
+{
+  return grub_error (GRUB_ERR_INVALID_COMMAND,
+		     "can\'t set datetime using U-Boot");
+}

grub-core/lib/uboot/halt.c

@@ -0,0 +1,31 @@
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 2013  Free Software Foundation, Inc.
+ *
+ *  GRUB is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  GRUB is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <grub/misc.h>
+#include <grub/mm.h>
+#include <grub/kernel.h>
+
+void
+grub_halt (void)
+{
+  grub_machine_fini ();
+
+  /* Just stop here */
+
+  while (1);
+}

grub-core/lib/uboot/reboot.c

@@ -0,0 +1,30 @@
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 2013  Free Software Foundation, Inc.
+ *
+ *  GRUB is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  GRUB is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <grub/kernel.h>
+#include <grub/misc.h>
+#include <grub/uboot/uboot.h>
+
+void
+grub_reboot (void)
+{
+  grub_machine_fini ();
+
+  grub_uboot_reset ();
+  while (1);
+}

grub-core/loader/arm/linux.c

@@ -0,0 +1,401 @@
+/* linux.c - boot Linux */
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 2013  Free Software Foundation, Inc.
+ *
+ *  GRUB is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  GRUB is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <grub/dl.h>
+#include <grub/fdt.h>
+#include <grub/file.h>
+#include <grub/loader.h>
+#include <grub/mm.h>
+#include <grub/misc.h>
+#include <grub/command.h>
+#include <grub/cache.h>
+#include <grub/cpu/linux.h>
+#include <grub/lib/cmdline.h>
+
+GRUB_MOD_LICENSE ("GPLv3+");
+
+static grub_dl_t my_mod;
+
+static grub_addr_t initrd_start;
+static grub_addr_t initrd_end;
+
+static grub_addr_t linux_addr;
+static grub_size_t linux_size;
+
+static char *linux_args;
+
+static grub_uint32_t machine_type;
+static void *fdt_addr;
+
+#define LINUX_ZIMAGE_OFFSET	0x24
+#define LINUX_ZIMAGE_MAGIC	0x016f2818
+
+#define ARM_FDT_MACHINE_TYPE 0xFFFFFFFF
+
+#define LINUX_PHYS_OFFSET        (0x00008000)
+#define LINUX_INITRD_PHYS_OFFSET (LINUX_PHYS_OFFSET + 0x02000000)
+#define LINUX_FDT_PHYS_OFFSET    (LINUX_INITRD_PHYS_OFFSET - 0x10000)
+
+/*
+ * linux_prepare_fdt():
+ *   Prepares a loaded FDT for being passed to Linux.
+ *   Merges in command line parameters and sets up initrd addresses.
+ */
+static grub_err_t
+linux_prepare_fdt (void)
+{
+  int node;
+  int retval;
+  int tmp_size;
+  void *tmp_fdt;
+
+  tmp_size = grub_fdt_get_totalsize (fdt_addr) + 0x100 + grub_strlen (linux_args);
+  tmp_fdt = grub_malloc (tmp_size);
+  if (!tmp_fdt)
+    return grub_errno;
+
+  grub_memcpy (tmp_fdt, fdt_addr, grub_fdt_get_totalsize (fdt_addr));
+  grub_fdt_set_totalsize (tmp_fdt, tmp_size);
+
+  /* Find or create '/chosen' node */
+  node = grub_fdt_find_subnode (tmp_fdt, 0, "chosen");
+  if (node < 0)
+    {
+      grub_printf ("No 'chosen' node in FDT - creating.\n");
+      node = grub_fdt_add_subnode (tmp_fdt, 0, "chosen");
+      if (node < 0)
+	goto failure;
+    }
+
+  grub_printf ("linux_args: '%s'\n", linux_args);
+
+  /* Generate and set command line */
+  retval = grub_fdt_set_prop (tmp_fdt, node, "bootargs", linux_args,
+			      grub_strlen (linux_args) + 1);
+  if (retval)
+    goto failure;
+
+  if (initrd_start && initrd_end)
+    {
+      /*
+       * We're using physical addresses, so even if we have LPAE, we're
+       * restricted to a 32-bit address space.
+       */
+      grub_dprintf ("loader", "Initrd @ 0x%08x-0x%08x\n",
+		    initrd_start, initrd_end);
+
+      retval = grub_fdt_set_prop32 (tmp_fdt, node, "linux,initrd-start",
+				    initrd_start);
+      if (retval)
+	goto failure;
+      retval = grub_fdt_set_prop32 (tmp_fdt, node, "linux,initrd-end",
+				    initrd_end);
+      if (retval)
+	goto failure;
+    }
+
+  /* Copy updated FDT to its launch location */
+  grub_memcpy (fdt_addr, tmp_fdt, tmp_size);
+  grub_free (tmp_fdt);
+
+  grub_dprintf ("loader", "FDT updated for Linux boot\n");
+
+  return GRUB_ERR_NONE;
+
+failure:
+  grub_free (tmp_fdt);
+  return grub_error (GRUB_ERR_BAD_ARGUMENT, "unable to prepare FDT");
+}
+
+static grub_err_t
+linux_boot (void)
+{
+  kernel_entry_t linuxmain;
+  grub_err_t err;
+
+  if (!fdt_addr && machine_type == ARM_FDT_MACHINE_TYPE)
+    return grub_error (GRUB_ERR_FILE_NOT_FOUND,
+		       N_("device tree must be supplied"));
+
+  grub_arch_sync_caches ((void *) linux_addr, linux_size);
+
+  grub_dprintf ("loader", "Kernel at: 0x%x\n", linux_addr);
+
+  err = linux_prepare_fdt ();
+  if (err)
+    return err;
+  grub_dprintf ("loader", "FDT @ 0x%p\n", fdt_addr);
+
+  grub_dprintf ("loader", "Jumping to Linux...\n");
+
+  /* Boot the kernel.
+   *   Arguments to kernel:
+   *     r0 - 0
+   *     r1 - machine type
+   *     r2 - address of DTB
+   */
+  linuxmain = (kernel_entry_t) linux_addr;
+
+#ifdef GRUB_MACHINE_EFI
+  err = grub_efi_prepare_platform();
+  if (err != GRUB_ERR_NONE)
+    return err;
+#endif
+
+  linuxmain (0, machine_type, fdt_addr);
+
+  return err;
+}
+
+/*
+ * Only support zImage, so no relocations necessary
+ */
+static grub_err_t
+linux_load (const char *filename, grub_file_t file)
+{
+  int size;
+
+  size = grub_file_size (file);
+  if (size == 0)
+    return grub_error (GRUB_ERR_BAD_OS, "empty kernel");
+
+#ifdef GRUB_MACHINE_EFI
+  linux_addr = (grub_addr_t) grub_efi_allocate_loader_memory (LINUX_PHYS_OFFSET, size);
+  if (!linux_addr)
+    return grub_errno;
+#else
+  linux_addr = LINUX_ADDRESS;
+#endif
+  grub_dprintf ("loader", "Loading Linux to 0x%08x\n",
+		(grub_addr_t) linux_addr);
+
+  if (grub_file_read (file, (void *) linux_addr, size) != size)
+    {
+      if (!grub_errno)
+	grub_error (GRUB_ERR_BAD_OS, N_("premature end of file %s"),
+		    filename);
+      return grub_errno;
+    }
+
+  if (*(grub_uint32_t *) (linux_addr + LINUX_ZIMAGE_OFFSET)
+      != LINUX_ZIMAGE_MAGIC)
+    {
+      return grub_error (GRUB_ERR_BAD_FILE_TYPE, N_("invalid zImage"));
+    }
+
+  linux_size = size;
+
+  return GRUB_ERR_NONE;
+}
+
+static grub_err_t
+linux_unload (void)
+{
+  grub_dl_unref (my_mod);
+
+  grub_free (linux_args);
+  linux_args = NULL;
+
+  initrd_start = initrd_end = 0;
+
+  return GRUB_ERR_NONE;
+}
+
+static grub_err_t
+grub_cmd_linux (grub_command_t cmd __attribute__ ((unused)),
+		int argc, char *argv[])
+{
+  int size;
+  grub_err_t err;
+  grub_file_t file;
+  grub_dl_ref (my_mod);
+
+  if (argc == 0)
+    return grub_error (GRUB_ERR_BAD_ARGUMENT, N_("filename expected"));
+
+  file = grub_file_open (argv[0]);
+  if (!file)
+    goto fail;
+
+  err = linux_load (argv[0], file);
+  grub_file_close (file);
+  if (err)
+    goto fail;
+
+  grub_loader_set (linux_boot, linux_unload, 0);
+
+  size = grub_loader_cmdline_size (argc, argv);
+  linux_args = grub_malloc (size + sizeof (LINUX_IMAGE));
+  if (!linux_args)
+    {
+      grub_loader_unset();
+      goto fail;
+    }
+
+  /* Create kernel command line.  */
+  grub_memcpy (linux_args, LINUX_IMAGE, sizeof (LINUX_IMAGE));
+  grub_create_loader_cmdline (argc, argv,
+			      linux_args + sizeof (LINUX_IMAGE) - 1, size);
+
+  return GRUB_ERR_NONE;
+
+fail:
+  grub_dl_unref (my_mod);
+  return grub_errno;
+}
+
+static grub_err_t
+grub_cmd_initrd (grub_command_t cmd __attribute__ ((unused)),
+		 int argc, char *argv[])
+{
+  grub_file_t file;
+  int size;
+
+  if (argc == 0)
+    return grub_error (GRUB_ERR_BAD_ARGUMENT, N_("filename expected"));
+
+  file = grub_file_open (argv[0]);
+  if (!file)
+    return grub_errno;
+
+  size = grub_file_size (file);
+  if (size == 0)
+    goto fail;
+
+  if (initrd_start)
+    grub_free ((void *) initrd_start);
+#ifdef GRUB_MACHINE_EFI
+  initrd_start = (grub_addr_t) grub_efi_allocate_loader_memory (LINUX_INITRD_PHYS_OFFSET, size);
+
+  if (!initrd_start)
+    {
+      grub_error (GRUB_ERR_OUT_OF_MEMORY, N_("memory allocation failed"));
+      goto fail;
+    }
+#else
+  initrd_start = LINUX_INITRD_ADDRESS;
+#endif
+
+  grub_dprintf ("loader", "Loading initrd to 0x%08x\n",
+		(grub_addr_t) initrd_start);
+
+  if (grub_file_read (file, (void *) initrd_start, size) != size)
+    {
+      initrd_start = 0;
+      if (!grub_errno)
+	grub_error (GRUB_ERR_BAD_OS, N_("premature end of file %s"),
+		    argv[0]);
+      goto fail;
+    }
+
+  initrd_end = initrd_start + size;
+
+  return GRUB_ERR_NONE;
+
+fail:
+  grub_file_close (file);
+
+  return grub_errno;
+}
+
+static grub_err_t
+load_dtb (grub_file_t dtb, int size)
+{
+  if ((grub_file_read (dtb, fdt_addr, size) != size)
+      || (grub_fdt_check_header (fdt_addr, size) != 0))
+    return grub_error (GRUB_ERR_BAD_OS, N_("invalid device tree"));
+
+  grub_fdt_set_totalsize (fdt_addr, size);
+  return GRUB_ERR_NONE;
+}
+
+static grub_err_t
+grub_cmd_devicetree (grub_command_t cmd __attribute__ ((unused)),
+		     int argc, char *argv[])
+{
+  grub_file_t dtb;
+  int size;
+
+  if (argc != 1)
+    return grub_error (GRUB_ERR_BAD_ARGUMENT, N_("filename expected"));
+
+  dtb = grub_file_open (argv[0]);
+  if (!dtb)
+    goto out;
+
+  size = grub_file_size (dtb);
+  if (size == 0)
+    {
+      grub_error (GRUB_ERR_BAD_OS, "empty file");
+      goto out;
+    }
+
+#ifdef GRUB_MACHINE_EFI
+  fdt_addr = grub_efi_allocate_loader_memory (LINUX_FDT_PHYS_OFFSET, size);
+  if (!fdt_addr)
+    {
+      grub_error (GRUB_ERR_OUT_OF_MEMORY, N_("memory allocation failed"));
+      goto out;
+    }
+#else
+  fdt_addr = (void *) LINUX_FDT_ADDRESS;
+#endif
+
+  grub_dprintf ("loader", "Loading device tree to 0x%08x\n",
+		(grub_addr_t) fdt_addr);
+  load_dtb (dtb, size);
+  if (grub_errno != GRUB_ERR_NONE)
+    {
+      fdt_addr = NULL;
+      goto out;
+    }
+
+  /* 
+   * We've successfully loaded an FDT, so any machine type passed
+   * from firmware is now obsolete.
+   */
+  machine_type = ARM_FDT_MACHINE_TYPE;
+
+ out:
+  grub_file_close (dtb);
+
+  return grub_errno;
+}
+
+static grub_command_t cmd_linux, cmd_initrd, cmd_devicetree;
+
+GRUB_MOD_INIT (linux)
+{
+  cmd_linux = grub_register_command ("linux", grub_cmd_linux,
+				     0, N_("Load Linux."));
+  cmd_initrd = grub_register_command ("initrd", grub_cmd_initrd,
+				      0, N_("Load initrd."));
+  cmd_devicetree = grub_register_command ("devicetree", grub_cmd_devicetree,
+					  0, N_("Load DTB file."));
+  my_mod = mod;
+  fdt_addr = (void *) firmware_get_boot_data ();
+  machine_type = firmware_get_machine_type ();
+}
+
+GRUB_MOD_FINI (linux)
+{
+  grub_unregister_command (cmd_linux);
+  grub_unregister_command (cmd_initrd);
+  grub_unregister_command (cmd_devicetree);
+}

grub-core/net/drivers/uboot/ubootnet.c

@@ -0,0 +1,161 @@
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 2013  Free Software Foundation, Inc.
+ *
+ *  GRUB is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  GRUB is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <grub/net/netbuff.h>
+#include <grub/uboot/disk.h>
+#include <grub/uboot/uboot.h>
+#include <grub/uboot/api_public.h>
+#include <grub/dl.h>
+#include <grub/net.h>
+#include <grub/time.h>
+#include <grub/i18n.h>
+
+GRUB_MOD_LICENSE ("GPLv3+");
+
+static grub_err_t
+card_open (struct grub_net_card *dev)
+{
+  int status;
+
+  status = grub_uboot_dev_open (dev->data);
+  if (status)
+    return grub_error (GRUB_ERR_IO, "Couldn't open network card.");
+
+  return GRUB_ERR_NONE;
+}
+
+static void
+card_close (struct grub_net_card *dev)
+{
+  grub_uboot_dev_close (dev->data);
+}
+
+static grub_err_t
+send_card_buffer (struct grub_net_card *dev, struct grub_net_buff *pack)
+{
+  int status;
+  grub_size_t len;
+
+  len = (pack->tail - pack->data);
+  if (len > dev->mtu)
+    len = dev->mtu;
+
+  grub_memcpy (dev->txbuf, pack->data, len);
+  status = grub_uboot_dev_send (dev->data, dev->txbuf, len);
+
+  if (status)
+    return grub_error (GRUB_ERR_IO, N_("couldn't send network packet"));
+  return GRUB_ERR_NONE;
+}
+
+static struct grub_net_buff *
+get_card_packet (struct grub_net_card *dev)
+{
+  int rc;
+  grub_uint64_t start_time;
+  struct grub_net_buff *nb;
+  int actual;
+
+  nb = grub_netbuff_alloc (dev->mtu + 64 + 2);
+  if (!nb)
+    return NULL;
+  /* Reserve 2 bytes so that 2 + 14/18 bytes of ethernet header is divisible
+     by 4. So that IP header is aligned on 4 bytes. */
+  grub_netbuff_reserve (nb, 2);
+
+  start_time = grub_get_time_ms ();
+  do
+    {
+      rc = grub_uboot_dev_recv (dev->data, nb->data, dev->mtu + 64, &actual);
+      grub_dprintf ("net", "rc=%d, actual=%d, time=%lld\n", rc, actual,
+		    grub_get_time_ms () - start_time);
+    }
+  while ((actual <= 0 || rc < 0) && (grub_get_time_ms () - start_time < 200));
+  if (actual > 0)
+    {
+      grub_netbuff_put (nb, actual);
+      return nb;
+    }
+  grub_netbuff_free (nb);
+  return NULL;
+}
+
+static struct grub_net_card_driver ubootnet =
+  {
+    .name = "ubnet",
+    .open = card_open,
+    .close = card_close,
+    .send = send_card_buffer,
+    .recv = get_card_packet
+  };
+
+GRUB_MOD_INIT (ubootnet)
+{
+  int devcount, i;
+  int nfound = 0;
+
+  devcount = grub_uboot_dev_enum ();
+
+  for (i = 0; i < devcount; i++)
+    {
+      struct device_info *devinfo = grub_uboot_dev_get (i);
+      struct grub_net_card *card;
+
+      if (!(devinfo->type & DEV_TYP_NET))
+	continue;
+
+      card = grub_zalloc (sizeof (struct grub_net_card));
+      if (!card)
+	{
+	  grub_print_error ();
+	  return;
+	}
+
+      /* FIXME: Any way to check this?  */
+      card->mtu = 1500;
+
+      grub_memcpy (&(card->default_address.mac), &devinfo->di_net.hwaddr, 6);
+      card->default_address.type = GRUB_NET_LINK_LEVEL_PROTOCOL_ETHERNET;
+
+      card->txbufsize = ALIGN_UP (card->mtu, 64) + 256;
+      card->txbuf = grub_zalloc (card->txbufsize);
+      if (!card->txbuf)
+	{
+	  grub_free (card);
+	  grub_print_error ();
+	  continue;
+	}
+
+      card->data = devinfo;
+      card->flags = 0;
+      card->name = grub_xasprintf ("ubnet_%d", ++nfound);
+      card->idle_poll_delay_ms = 10;
+
+      card->driver = &ubootnet;
+      grub_net_card_register (card);
+    }
+}
+
+GRUB_MOD_FINI (ubootnet)
+{
+  struct grub_net_card *card, *next;
+
+  FOR_NET_CARDS_SAFE (card, next) 
+    if (card->driver && grub_strcmp (card->driver->name, "ubnet") == 0)
+      grub_net_card_unregister (card);
+}

grub-core/term/terminfo.c

@@ -745,7 +745,9 @@ grub_cmd_terminfo (grub_extcmd_context_t ctxt, int argc, char **args)
 
 static grub_extcmd_t cmd;
 
-#if defined (GRUB_MACHINE_IEEE1275) || defined (GRUB_MACHINE_MIPS_LOONGSON) || defined (GRUB_MACHINE_MIPS_QEMU_MIPS) || defined (GRUB_MACHINE_ARC)
+#if defined (GRUB_MACHINE_IEEE1275) || defined (GRUB_MACHINE_MIPS_LOONGSON) \
+  || defined (GRUB_MACHINE_MIPS_QEMU_MIPS) || defined (GRUB_MACHINE_ARC) \
+  || defined (GRUB_MACHINE_UBOOT)
 void grub_terminfo_init (void)
 #else
 GRUB_MOD_INIT(terminfo)

grub-core/term/uboot/console.c

@@ -0,0 +1,141 @@
+/* console.c - console interface layer for U-Boot platforms */
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 2013  Free Software Foundation, Inc.
+ *
+ *  GRUB is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  GRUB is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <grub/term.h>
+#include <grub/misc.h>
+#include <grub/types.h>
+#include <grub/err.h>
+#include <grub/terminfo.h>
+#include <grub/uboot/uboot.h>
+#include <grub/uboot/console.h>
+
+static void
+put (struct grub_term_output *term __attribute__ ((unused)), const int c)
+{
+  grub_uboot_putc (c);
+}
+
+static int
+readkey (struct grub_term_input *term __attribute__ ((unused)))
+{
+  if (grub_uboot_tstc () > 0)
+    return grub_uboot_getc ();
+
+  return -1;
+}
+
+static void
+uboot_console_setcursor (struct grub_term_output *term
+			 __attribute__ ((unused)), int on
+			 __attribute__ ((unused)))
+{
+  grub_terminfo_setcursor (term, on);
+}
+
+static grub_err_t
+uboot_console_init_input (struct grub_term_input *term)
+{
+  return grub_terminfo_input_init (term);
+}
+
+extern struct grub_terminfo_output_state uboot_console_terminfo_output;
+
+static void
+uboot_console_dimensions (void)
+{
+  /* Use a small console by default.  */
+  if (!uboot_console_terminfo_output.width)
+    uboot_console_terminfo_output.width = 80;
+  if (!uboot_console_terminfo_output.height)
+    uboot_console_terminfo_output.height = 24;
+}
+
+static grub_err_t
+uboot_console_init_output (struct grub_term_output *term)
+{
+  uboot_console_dimensions ();
+
+  grub_terminfo_output_init (term);
+
+  return 0;
+}
+
+struct grub_terminfo_input_state uboot_console_terminfo_input = {
+  .readkey = readkey
+};
+
+struct grub_terminfo_output_state uboot_console_terminfo_output = {
+  .put = put,
+  .width = 80,
+  .height = 24
+};
+
+static struct grub_term_input uboot_console_term_input = {
+  .name = "console",
+  .init = uboot_console_init_input,
+  .getkey = grub_terminfo_getkey,
+  .data = &uboot_console_terminfo_input
+};
+
+static struct grub_term_output uboot_console_term_output = {
+  .name = "console",
+  .init = uboot_console_init_output,
+  .putchar = grub_terminfo_putchar,
+  .getwh = grub_terminfo_getwh,
+  .getxy = grub_terminfo_getxy,
+  .gotoxy = grub_terminfo_gotoxy,
+  .cls = grub_terminfo_cls,
+  .setcolorstate = grub_terminfo_setcolorstate,
+  .setcursor = uboot_console_setcursor,
+  .flags = GRUB_TERM_CODE_TYPE_ASCII,
+  .data = &uboot_console_terminfo_output,
+};
+
+void
+grub_console_init_early (void)
+{
+  grub_term_register_input ("console", &uboot_console_term_input);
+  grub_term_register_output ("console", &uboot_console_term_output);
+}
+
+
+/*
+ * grub_console_init_lately():
+ *   Initializes terminfo formatting by registering terminal type.
+ *   Called after heap has been configured.
+ *   
+ */
+void
+grub_console_init_lately (void)
+{
+  const char *type;
+
+  /* See if explicitly set by U-Boot environment */
+  type = grub_uboot_env_get ("grub_term");
+  if (!type)
+    type = "vt100";
+
+  grub_terminfo_init ();
+  grub_terminfo_output_register (&uboot_console_term_output, type);
+}
+
+void
+grub_console_fini (void)
+{
+}

include/grub/arm/efi/loader.h

@@ -0,0 +1,26 @@
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 2013  Free Software Foundation, Inc.
+ *
+ *  GRUB is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  GRUB is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef GRUB_LOADER_MACHINE_HEADER
+#define GRUB_LOADER_MACHINE_HEADER	1
+
+grub_err_t EXPORT_FUNC (grub_efi_prepare_platform) (void);
+void * EXPORT_FUNC (grub_efi_allocate_loader_memory) (grub_uint32_t min_offset,
+						      grub_uint32_t size);
+
+#endif /* ! GRUB_LOADER_MACHINE_HEADER */

include/grub/arm/efi/memory.h

@@ -0,0 +1 @@
+#include <grub/efi/memory.h>

include/grub/arm/linux.h

@@ -0,0 +1,59 @@
+/* linux.h - ARM linux specific definitions */
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 2013  Free Software Foundation, Inc.
+ *
+ *  GRUB is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  GRUB is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef GRUB_LINUX_CPU_HEADER
+#define GRUB_LINUX_CPU_HEADER 1
+
+#define LINUX_ZIMAGE_OFFSET 0x24
+#define LINUX_ZIMAGE_MAGIC  0x016f2818
+
+#define ARM_FDT_MACHINE_TYPE 0xFFFFFFFF
+
+#if defined GRUB_MACHINE_UBOOT
+# include <grub/uboot/uboot.h>
+# define LINUX_ADDRESS        (start_of_ram + 0x8000)
+# define LINUX_INITRD_ADDRESS (start_of_ram + 0x02000000)
+# define LINUX_FDT_ADDRESS    (LINUX_INITRD_ADDRESS - 0x10000)
+# define firmware_get_boot_data grub_uboot_get_boot_data
+# define firmware_get_machine_type grub_uboot_get_machine_type
+#elif defined GRUB_MACHINE_EFI
+# include <grub/efi/efi.h>
+# include <grub/machine/loader.h>
+/* On UEFI platforms - load the images at the lowest available address not
+   less than *_PHYS_OFFSET from the first available memory location. */
+# define LINUX_PHYS_OFFSET        (0x00008000)
+# define LINUX_INITRD_PHYS_OFFSET (LINUX_PHYS_OFFSET + 0x02000000)
+# define LINUX_FDT_PHYS_OFFSET    (LINUX_INITRD_PHYS_OFFSET - 0x10000)
+static inline grub_addr_t
+firmware_get_boot_data (void)
+{
+  return 0;
+}
+static inline grub_uint32_t
+firmware_get_machine_type (void)
+{
+  return ARM_FDT_MACHINE_TYPE;
+}
+#endif
+
+#define FDT_ADDITIONAL_ENTRIES_SIZE	0x300
+
+typedef void (*kernel_entry_t) (int, unsigned long, void *);
+
+#endif /* ! GRUB_LINUX_CPU_HEADER */

include/grub/arm/reloc.h

@@ -0,0 +1,27 @@
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 2013  Free Software Foundation, Inc.
+ *
+ *  GRUB is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  GRUB is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef GRUB_ARM_RELOC_H
+#define GRUB_ARM_RELOC_H 1
+
+grub_err_t grub_arm_reloc_abs32 (grub_uint32_t *addr, Elf32_Addr sym_addr);
+grub_err_t grub_arm_reloc_jump24 (grub_uint32_t *addr, Elf32_Addr sym_addr);
+grub_err_t grub_arm_reloc_thm_call (grub_uint16_t *addr, Elf32_Addr sym_addr);
+grub_err_t grub_arm_reloc_thm_jump19 (grub_uint16_t *addr, Elf32_Addr sym_addr);
+
+#endif

include/grub/arm/setjmp.h

@@ -0,0 +1,27 @@
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 2002,2004,2006,2007,2009  Free Software Foundation, Inc.
+ *
+ *  GRUB is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  GRUB is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef GRUB_SETJMP_CPU_HEADER
+#define GRUB_SETJMP_CPU_HEADER	1
+
+typedef unsigned long grub_jmp_buf[10];
+
+int grub_setjmp (grub_jmp_buf env) __attribute__ ((returns_twice));
+void grub_longjmp (grub_jmp_buf env, int val) __attribute__ ((noreturn));
+
+#endif /* ! GRUB_SETJMP_CPU_HEADER */

include/grub/arm/system.h

@@ -0,0 +1,7 @@
+#ifndef GRUB_SYSTEM_CPU_HEADER
+#define GRUB_SYSTEM_CPU_HEADER
+
+void grub_arm_disable_caches_mmu (void);
+
+#endif /* ! GRUB_SYSTEM_CPU_HEADER */
+

include/grub/arm/time.h

@@ -0,0 +1,29 @@
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 2013  Free Software Foundation, Inc.
+ *
+ *  GRUB is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  GRUB is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef KERNEL_CPU_TIME_HEADER
+#define KERNEL_CPU_TIME_HEADER	1
+
+static __inline void
+grub_cpu_idle (void)
+{
+  /* FIXME: this can't work until we handle interrupts.  */
+/*  __asm__ __volatile__ ("wfi"); */
+}
+
+#endif /* ! KERNEL_CPU_TIME_HEADER */

include/grub/arm/types.h

@@ -0,0 +1,34 @@
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 2013  Free Software Foundation, Inc.
+ *
+ *  GRUB is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  GRUB is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef GRUB_TYPES_CPU_HEADER
+#define GRUB_TYPES_CPU_HEADER	1
+
+/* The size of void *.  */
+#define GRUB_TARGET_SIZEOF_VOID_P	4
+
+/* The size of long.  */
+#define GRUB_TARGET_SIZEOF_LONG		4
+
+/* currently only support little-endian.  */
+#undef GRUB_TARGET_WORDS_BIGENDIAN
+
+/* Unaligned accesses only supported if MMU enabled */
+//#define GRUB_HAVE_UNALIGNED_ACCESS 1
+
+#endif /* ! GRUB_TYPES_CPU_HEADER */

include/grub/arm/uboot/kernel.h

@@ -0,0 +1,32 @@
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 2013 Free Software Foundation, Inc.
+ *
+ *  GRUB is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  GRUB is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef GRUB_KERNEL_MACHINE_HEADER
+#define GRUB_KERNEL_MACHINE_HEADER	1
+
+#ifndef ASM_FILE
+
+#include <grub/symbol.h>
+#include <grub/types.h>
+
+#endif /* ! ASM_FILE */
+
+#define GRUB_KERNEL_MACHINE_STACK_SIZE 0x40000
+#define GRUB_KERNEL_MACHINE_HEAP_SIZE  (grub_size_t) (2 * 1024 * 1024)
+
+#endif /* ! GRUB_KERNEL_MACHINE_HEADER */

include/grub/disk.h

@@ -46,7 +46,8 @@ enum grub_disk_dev_id
     GRUB_DISK_DEVICE_ARCDISK_ID,
     GRUB_DISK_DEVICE_HOSTDISK_ID,
     GRUB_DISK_DEVICE_PROCFS_ID,
-    GRUB_DISK_DEVICE_CBFSDISK_ID
+    GRUB_DISK_DEVICE_CBFSDISK_ID,
+    GRUB_DISK_DEVICE_UBOOTDISK_ID,
   };
 
 struct grub_disk;

include/grub/efi/pe32.h

@@ -63,9 +63,10 @@ struct grub_pe32_coff_header
   grub_uint16_t characteristics;
 };
 
-#define GRUB_PE32_MACHINE_I386		0x14c
+#define GRUB_PE32_MACHINE_I386			0x14c
-#define GRUB_PE32_MACHINE_IA64		0x200
+#define GRUB_PE32_MACHINE_IA64			0x200
-#define GRUB_PE32_MACHINE_X86_64	0x8664
+#define GRUB_PE32_MACHINE_X86_64		0x8664
+#define GRUB_PE32_MACHINE_ARMTHUMB_MIXED	0x01c2
 
 #define GRUB_PE32_RELOCS_STRIPPED		0x0001
 #define GRUB_PE32_EXECUTABLE_IMAGE		0x0002
@@ -276,8 +277,10 @@ struct grub_pe32_fixup_block
 #define GRUB_PE32_REL_BASED_HIGHLOW	3
 #define GRUB_PE32_REL_BASED_HIGHADJ	4
 #define GRUB_PE32_REL_BASED_MIPS_JMPADDR 5
+#define GRUB_PE32_REL_BASED_ARM_MOV32A  5
 #define GRUB_PE32_REL_BASED_SECTION	6
 #define GRUB_PE32_REL_BASED_REL		7
+#define GRUB_PE32_REL_BASED_ARM_MOV32T  7
 #define GRUB_PE32_REL_BASED_IA64_IMM64	9
 #define GRUB_PE32_REL_BASED_DIR64	10
 #define GRUB_PE32_REL_BASED_HIGH3ADJ	11

include/grub/fdt.h

@@ -0,0 +1,99 @@
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 2013  Free Software Foundation, Inc.
+ *
+ *  GRUB is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  GRUB is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef GRUB_FDT_HEADER
+#define GRUB_FDT_HEADER	1
+
+#include <grub/types.h>
+
+#define FDT_MAGIC 0xD00DFEED
+
+typedef struct {
+	grub_uint32_t magic;
+	grub_uint32_t totalsize;
+	grub_uint32_t off_dt_struct;
+	grub_uint32_t off_dt_strings;
+	grub_uint32_t off_mem_rsvmap;
+	grub_uint32_t version;
+	grub_uint32_t last_comp_version;
+	grub_uint32_t boot_cpuid_phys;
+	grub_uint32_t size_dt_strings;
+	grub_uint32_t size_dt_struct;
+} grub_fdt_header_t;
+
+#define grub_fdt_get_header(fdt, field)	\
+	grub_be_to_cpu32(((const grub_fdt_header_t *)(fdt))->field)
+#define grub_fdt_set_header(fdt, field, value)	\
+	((grub_fdt_header_t *)(fdt))->field = grub_cpu_to_be32(value)
+
+#define grub_fdt_get_magic(fdt)	\
+	grub_fdt_get_header(fdt, magic)
+#define grub_fdt_set_magic(fdt, value)	\
+	grub_fdt_set_header(fdt, magic, value)
+#define grub_fdt_get_totalsize(fdt)	\
+	grub_fdt_get_header(fdt, totalsize)
+#define grub_fdt_set_totalsize(fdt, value)	\
+	grub_fdt_set_header(fdt, totalsize, value)
+#define grub_fdt_get_off_dt_struct(fdt)	\
+	grub_fdt_get_header(fdt, off_dt_struct)
+#define grub_fdt_set_off_dt_struct(fdt, value)	\
+	grub_fdt_set_header(fdt, off_dt_struct, value)
+#define grub_fdt_get_off_dt_strings(fdt)	\
+	grub_fdt_get_header(fdt, off_dt_strings)
+#define grub_fdt_set_off_dt_strings(fdt, value)	\
+	grub_fdt_set_header(fdt, off_dt_strings, value)
+#define grub_fdt_get_off_mem_rsvmap(fdt)	\
+	grub_fdt_get_header(fdt, off_mem_rsvmap)
+#define grub_fdt_set_off_mem_rsvmap(fdt, value)	\
+	grub_fdt_set_header(fdt, off_mem_rsvmap, value)
+#define grub_fdt_get_version(fdt)	\
+	grub_fdt_get_header(fdt, version)
+#define grub_fdt_set_version(fdt, value)	\
+	grub_fdt_set_header(fdt, version, value)
+#define grub_fdt_get_last_comp_version(fdt)	\
+	grub_fdt_get_header(fdt, last_comp_version)
+#define grub_fdt_set_last_comp_version(fdt, value)	\
+	grub_fdt_set_header(fdt, last_comp_version, value)
+#define grub_fdt_get_boot_cpuid_phys(fdt)	\
+	grub_fdt_get_header(fdt, boot_cpuid_phys)
+#define grub_fdt_set_boot_cpuid_phys(fdt, value)	\
+	grub_fdt_set_header(fdt, boot_cpuid_phys, value)
+#define grub_fdt_get_size_dt_strings(fdt)	\
+	grub_fdt_get_header(fdt, size_dt_strings)
+#define grub_fdt_set_size_dt_strings(fdt, value)	\
+	grub_fdt_set_header(fdt, size_dt_strings, value)
+#define grub_fdt_get_size_dt_struct(fdt)	\
+	grub_fdt_get_header(fdt, size_dt_struct)
+#define grub_fdt_set_size_dt_struct(fdt, value)	\
+	grub_fdt_set_header(fdt, size_dt_struct, value)
+
+int grub_fdt_check_header (void *fdt, unsigned int size);
+int grub_fdt_find_subnode (const void *fdt, unsigned int parentoffset,
+			   const char *name);
+int grub_fdt_add_subnode (void *fdt, unsigned int parentoffset,
+			  const char *name);
+
+int grub_fdt_set_prop (void *fdt, unsigned int nodeoffset, const char *name,
+		      const void *val, grub_uint32_t len);
+#define grub_fdt_set_prop32(fdt, nodeoffset, name, val)	\
+({ \
+  grub_uint32_t _val = grub_cpu_to_be32(val); \
+  grub_fdt_set_prop ((fdt), (nodeoffset), (name), &_val, 4);	\
+})
+
+#endif	/* ! GRUB_FDT_HEADER */

include/grub/kernel.h

@@ -78,7 +78,7 @@ struct grub_module_info64
 #if defined (GRUB_MACHINE_PCBIOS) || defined (GRUB_MACHINE_COREBOOT) \
   || defined (GRUB_MACHINE_MULTIBOOT) || defined (GRUB_MACHINE_MIPS_QEMU_MIPS) \
   || defined (GRUB_MACHINE_MIPS_LOONGSON) || defined (GRUB_MACHINE_ARC) \
-  || defined (__sparc__)
+  || defined (__sparc__) || defined (GRUB_MACHINE_UBOOT)
 /* FIXME: stack is between 2 heap regions. Move it.  */
 #define GRUB_KERNEL_PRELOAD_SPACE_REUSABLE 1
 #endif

include/grub/libgcc.h

@@ -112,3 +112,14 @@ void EXPORT_FUNC (_savegpr_29) (void);
 void EXPORT_FUNC (_savegpr_30) (void);
 void EXPORT_FUNC (_savegpr_31) (void);
 #endif
+
+#if defined (__arm__)
+void EXPORT_FUNC (__aeabi_idiv) (void);
+void EXPORT_FUNC (__aeabi_idivmod) (void);
+void EXPORT_FUNC (__aeabi_lasr) (void);
+void EXPORT_FUNC (__aeabi_llsl) (void);
+void EXPORT_FUNC (__aeabi_llsr) (void);
+void EXPORT_FUNC (__aeabi_uidiv) (void);
+void EXPORT_FUNC (__aeabi_uidivmod) (void);
+void EXPORT_FUNC (__aeabi_ulcmp) (void);
+#endif

include/grub/offsets.h

@@ -103,6 +103,7 @@
 #define GRUB_KERNEL_I386_IEEE1275_MOD_GAP 0x0
 #define GRUB_KERNEL_I386_COREBOOT_MOD_GAP 0x0
 #define GRUB_KERNEL_SPARC64_IEEE1275_MOD_GAP 0x0
+#define GRUB_KERNEL_ARM_UBOOT_MOD_GAP 0x0
 
 #define GRUB_KERNEL_POWERPC_IEEE1275_MOD_ALIGN 0x1000
 #define GRUB_KERNEL_SPARC64_IEEE1275_MOD_ALIGN 0x1
@@ -111,6 +112,10 @@
 #define GRUB_KERNEL_MIPS_ARC_MOD_ALIGN 0x1
 #define GRUB_KERNEL_MIPS_QEMU_MIPS_MOD_ALIGN 0x1
 
+#define GRUB_KERNEL_ARM_UBOOT_MOD_ALIGN 	0x8
+#define GRUB_KERNEL_ARM_UBOOT_TOTAL_MODULE_SIZE	0x4
+#define GRUB_KERNEL_ARM_UBOOT_LINK_ADDR		0x08000000
+
 /* Minimal gap between _end and the start of the modules.  It's a hack
    for PowerMac to prevent "CLAIM failed" error.  The real fix is to
    rewrite grub-mkimage to generate valid ELF files.  */

include/grub/uboot/api_public.h

@@ -0,0 +1,181 @@
+/*
+ * (C) Copyright 2007-2008 Semihalf
+ *
+ * Written by: Rafal Jaworowski <raj@semihalf.com>
+ *
+ * This file is dual licensed; you can use it under the terms of
+ * either the GPL, or the BSD license, at your option.
+ *
+ * I. GPL:
+ *
+ * This file is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This file is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ *
+ * Alternatively,
+ *
+ * II. BSD license:
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#ifndef _API_PUBLIC_H_
+#define _API_PUBLIC_H_
+
+#define API_EINVAL		1	/* invalid argument(s)  */
+#define API_ENODEV		2	/* no device            */
+#define API_ENOMEM		3	/* no memory            */
+#define API_EBUSY		4	/* busy, occupied etc.  */
+#define API_EIO			5	/* I/O error            */
+#define API_ESYSC		6	/* syscall error        */
+
+typedef int (*scp_t) (int, int *, ...);
+
+#define API_SIG_VERSION	1
+#define API_SIG_MAGIC	"UBootAPI"
+#define API_SIG_MAGLEN	8
+
+struct api_signature
+{
+  char magic[API_SIG_MAGLEN];	/* magic string */
+  grub_uint16_t version;	/* API version */
+  grub_uint32_t checksum;	/* checksum of this sig struct */
+  scp_t syscall;		/* entry point to the API */
+};
+
+enum
+{
+  API_RSVD = 0,
+  API_GETC,
+  API_PUTC,
+  API_TSTC,
+  API_PUTS,
+  API_RESET,
+  API_GET_SYS_INFO,
+  API_UDELAY,
+  API_GET_TIMER,
+  API_DEV_ENUM,
+  API_DEV_OPEN,
+  API_DEV_CLOSE,
+  API_DEV_READ,
+  API_DEV_WRITE,
+  API_ENV_ENUM,
+  API_ENV_GET,
+  API_ENV_SET,
+  API_DISPLAY_GET_INFO,
+  API_DISPLAY_DRAW_BITMAP,
+  API_DISPLAY_CLEAR,
+  API_MAXCALL
+};
+
+#define MR_ATTR_FLASH	0x0001
+#define MR_ATTR_DRAM	0x0002
+#define MR_ATTR_SRAM	0x0003
+#define MR_ATTR_MASK	0x000f
+
+struct mem_region
+{
+  unsigned long start;
+  unsigned long size;
+  int flags;
+};
+
+struct sys_info
+{
+  unsigned long clk_bus;
+  unsigned long clk_cpu;
+  unsigned long bar;
+  struct mem_region *mr;
+  int mr_no;			/* number of memory regions */
+};
+
+#undef CONFIG_SYS_64BIT_LBA
+#ifdef CONFIG_SYS_64BIT_LBA
+typedef u_int64_t lbasize_t;
+#else
+typedef unsigned long lbasize_t;
+#endif
+typedef unsigned long lbastart_t;
+
+#define DEV_TYP_NONE	0x0000
+#define DEV_TYP_NET	0x0001
+
+#define DEV_TYP_STOR	0x0002
+#define DT_STOR_IDE	0x0010
+#define DT_STOR_SCSI	0x0020
+#define DT_STOR_USB	0x0040
+#define DT_STOR_MMC	0x0080
+#define DT_STOR_SATA	0x0100
+
+#define DEV_STA_CLOSED	0x0000	/* invalid, closed */
+#define DEV_STA_OPEN	0x0001	/* open i.e. active */
+
+struct device_info
+{
+  int type;
+  void *cookie;
+
+  union
+  {
+    struct
+    {
+      lbasize_t block_count;	/* no of blocks */
+      unsigned long block_size;	/* size of one block */
+    } storage;
+
+    struct
+    {
+      unsigned char hwaddr[6];
+    } net;
+  } info;
+#define di_stor info.storage
+#define di_net info.net
+
+  int state;
+};
+
+#define DISPLAY_TYPE_LCD	0x0001
+#define DISPLAY_TYPE_VIDEO	0x0002
+
+struct display_info
+{
+  int type;
+  /* screen size in pixels */
+  int pixel_width;
+  int pixel_height;
+  /* screen size in rows and columns of text */
+  int screen_rows;
+  int screen_cols;
+};
+
+#endif /* _API_PUBLIC_H_ */

include/grub/uboot/console.h

@@ -0,0 +1,29 @@
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 2013  Free Software Foundation, Inc.
+ *
+ *  GRUB is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  GRUB is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef GRUB_CONSOLE_MACHINE_HEADER
+#define GRUB_CONSOLE_MACHINE_HEADER 1
+
+/* Initialize the console system.  */
+void grub_console_init_early (void);
+void grub_console_init_lately (void);
+
+/* Exit the console system.  */
+void grub_console_fini (void);
+
+#endif /* ! GRUB_CONSOLE_MACHINE_HEADER */

include/grub/uboot/disk.h

@@ -0,0 +1,43 @@
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 2013  Free Software Foundation, Inc.
+ *
+ *  GRUB is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  GRUB is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef GRUB_UBOOT_DISK_HEADER
+#define GRUB_UBOOT_DISK_HEADER	1
+
+#include <grub/symbol.h>
+#include <grub/disk.h>
+#include <grub/uboot/uboot.h>
+
+void grub_ubootdisk_init (void);
+void grub_ubootdisk_fini (void);
+
+enum disktype
+{ cd, fd, hd };
+
+struct ubootdisk_data
+{
+  void *cookie;
+  struct device_info *dev;
+  int opencount;
+  enum disktype type;
+  grub_uint32_t block_size;
+};
+
+grub_err_t grub_ubootdisk_register (struct device_info *newdev);
+
+#endif /* ! GRUB_UBOOT_DISK_HEADER */

include/grub/uboot/image.h

@@ -0,0 +1,175 @@
+/*
+ * (C) Copyright 2008 Semihalf
+ *
+ * (C) Copyright 2000-2005
+ * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.	 See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ *
+ ********************************************************************
+ * NOTE: This header file defines an interface to U-Boot. Including
+ * this (unmodified) header file in another file is considered normal
+ * use of U-Boot, and does *not* fall under the heading of "derived
+ * work".
+ ********************************************************************
+ */
+
+#ifndef __GRUB_UBOOT_IMAGE_H__
+#define __GRUB_UBOOT_IMAGE_H__
+
+/*
+ * Operating System Codes
+ */
+#define GRUB_UBOOT_IH_OS_INVALID		0	/* Invalid OS	*/
+#define GRUB_UBOOT_IH_OS_OPENBSD		1	/* OpenBSD	*/
+#define GRUB_UBOOT_IH_OS_NETBSD		2	/* NetBSD	*/
+#define GRUB_UBOOT_IH_OS_FREEBSD		3	/* FreeBSD	*/
+#define GRUB_UBOOT_IH_OS_4_4BSD		4	/* 4.4BSD	*/
+#define GRUB_UBOOT_IH_OS_LINUX		5	/* Linux	*/
+#define GRUB_UBOOT_IH_OS_SVR4		6	/* SVR4		*/
+#define GRUB_UBOOT_IH_OS_ESIX		7	/* Esix		*/
+#define GRUB_UBOOT_IH_OS_SOLARIS		8	/* Solaris	*/
+#define GRUB_UBOOT_IH_OS_IRIX		9	/* Irix		*/
+#define GRUB_UBOOT_IH_OS_SCO		10	/* SCO		*/
+#define GRUB_UBOOT_IH_OS_DELL		11	/* Dell		*/
+#define GRUB_UBOOT_IH_OS_NCR		12	/* NCR		*/
+#define GRUB_UBOOT_IH_OS_LYNXOS		13	/* LynxOS	*/
+#define GRUB_UBOOT_IH_OS_VXWORKS		14	/* VxWorks	*/
+#define GRUB_UBOOT_IH_OS_PSOS		15	/* pSOS		*/
+#define GRUB_UBOOT_IH_OS_QNX		16	/* QNX		*/
+#define GRUB_UBOOT_IH_OS_U_BOOT		17	/* Firmware	*/
+#define GRUB_UBOOT_IH_OS_RTEMS		18	/* RTEMS	*/
+#define GRUB_UBOOT_IH_OS_ARTOS		19	/* ARTOS	*/
+#define GRUB_UBOOT_IH_OS_UNITY		20	/* Unity OS	*/
+#define GRUB_UBOOT_IH_OS_INTEGRITY		21	/* INTEGRITY	*/
+#define GRUB_UBOOT_IH_OS_OSE		22	/* OSE		*/
+
+/*
+ * CPU Architecture Codes (supported by Linux)
+ */
+#define GRUB_UBOOT_IH_ARCH_INVALID		0	/* Invalid CPU	*/
+#define GRUB_UBOOT_IH_ARCH_ALPHA		1	/* Alpha	*/
+#define GRUB_UBOOT_IH_ARCH_ARM		2	/* ARM		*/
+#define GRUB_UBOOT_IH_ARCH_I386		3	/* Intel x86	*/
+#define GRUB_UBOOT_IH_ARCH_IA64		4	/* IA64		*/
+#define GRUB_UBOOT_IH_ARCH_MIPS		5	/* MIPS		*/
+#define GRUB_UBOOT_IH_ARCH_MIPS64		6	/* MIPS	 64 Bit */
+#define GRUB_UBOOT_IH_ARCH_PPC		7	/* PowerPC	*/
+#define GRUB_UBOOT_IH_ARCH_S390		8	/* IBM S390	*/
+#define GRUB_UBOOT_IH_ARCH_SH		9	/* SuperH	*/
+#define GRUB_UBOOT_IH_ARCH_SPARC		10	/* Sparc	*/
+#define GRUB_UBOOT_IH_ARCH_SPARC64		11	/* Sparc 64 Bit */
+#define GRUB_UBOOT_IH_ARCH_M68K		12	/* M68K		*/
+#define GRUB_UBOOT_IH_ARCH_MICROBLAZE	14	/* MicroBlaze   */
+#define GRUB_UBOOT_IH_ARCH_NIOS2		15	/* Nios-II	*/
+#define GRUB_UBOOT_IH_ARCH_BLACKFIN	16	/* Blackfin	*/
+#define GRUB_UBOOT_IH_ARCH_AVR32		17	/* AVR32	*/
+#define GRUB_UBOOT_IH_ARCH_ST200	        18	/* STMicroelectronics ST200  */
+#define GRUB_UBOOT_IH_ARCH_SANDBOX		19	/* Sandbox architecture (test only) */
+#define GRUB_UBOOT_IH_ARCH_NDS32	        20	/* ANDES Technology - NDS32  */
+#define GRUB_UBOOT_IH_ARCH_OPENRISC        21	/* OpenRISC 1000  */
+
+/*
+ * Image Types
+ *
+ * "Standalone Programs" are directly runnable in the environment
+ *	provided by U-Boot; it is expected that (if they behave
+ *	well) you can continue to work in U-Boot after return from
+ *	the Standalone Program.
+ * "OS Kernel Images" are usually images of some Embedded OS which
+ *	will take over control completely. Usually these programs
+ *	will install their own set of exception handlers, device
+ *	drivers, set up the MMU, etc. - this means, that you cannot
+ *	expect to re-enter U-Boot except by resetting the CPU.
+ * "RAMDisk Images" are more or less just data blocks, and their
+ *	parameters (address, size) are passed to an OS kernel that is
+ *	being started.
+ * "Multi-File Images" contain several images, typically an OS
+ *	(Linux) kernel image and one or more data images like
+ *	RAMDisks. This construct is useful for instance when you want
+ *	to boot over the network using BOOTP etc., where the boot
+ *	server provides just a single image file, but you want to get
+ *	for instance an OS kernel and a RAMDisk image.
+ *
+ *	"Multi-File Images" start with a list of image sizes, each
+ *	image size (in bytes) specified by an "uint32_t" in network
+ *	byte order. This list is terminated by an "(uint32_t)0".
+ *	Immediately after the terminating 0 follow the images, one by
+ *	one, all aligned on "uint32_t" boundaries (size rounded up to
+ *	a multiple of 4 bytes - except for the last file).
+ *
+ * "Firmware Images" are binary images containing firmware (like
+ *	U-Boot or FPGA images) which usually will be programmed to
+ *	flash memory.
+ *
+ * "Script files" are command sequences that will be executed by
+ *	U-Boot's command interpreter; this feature is especially
+ *	useful when you configure U-Boot to use a real shell (hush)
+ *	as command interpreter (=> Shell Scripts).
+ */
+
+#define GRUB_UBOOT_IH_TYPE_INVALID		0	/* Invalid Image		*/
+#define GRUB_UBOOT_IH_TYPE_STANDALONE	1	/* Standalone Program		*/
+#define GRUB_UBOOT_IH_TYPE_KERNEL		2	/* OS Kernel Image		*/
+#define GRUB_UBOOT_IH_TYPE_RAMDISK		3	/* RAMDisk Image		*/
+#define GRUB_UBOOT_IH_TYPE_MULTI		4	/* Multi-File Image		*/
+#define GRUB_UBOOT_IH_TYPE_FIRMWARE	5	/* Firmware Image		*/
+#define GRUB_UBOOT_IH_TYPE_SCRIPT		6	/* Script file			*/
+#define GRUB_UBOOT_IH_TYPE_FILESYSTEM	7	/* Filesystem Image (any type)	*/
+#define GRUB_UBOOT_IH_TYPE_FLATDT		8	/* Binary Flat Device Tree Blob	*/
+#define GRUB_UBOOT_IH_TYPE_KWBIMAGE	9	/* Kirkwood Boot Image		*/
+#define GRUB_UBOOT_IH_TYPE_IMXIMAGE	10	/* Freescale IMXBoot Image	*/
+#define GRUB_UBOOT_IH_TYPE_UBLIMAGE	11	/* Davinci UBL Image		*/
+#define GRUB_UBOOT_IH_TYPE_OMAPIMAGE	12	/* TI OMAP Config Header Image	*/
+#define GRUB_UBOOT_IH_TYPE_AISIMAGE	13	/* TI Davinci AIS Image		*/
+#define GRUB_UBOOT_IH_TYPE_KERNEL_NOLOAD	14	/* OS Kernel Image, can run from any load address */
+#define GRUB_UBOOT_IH_TYPE_PBLIMAGE	15	/* Freescale PBL Boot Image	*/
+
+/*
+ * Compression Types
+ */
+#define GRUB_UBOOT_IH_COMP_NONE		0	/*  No	 Compression Used	*/
+#define GRUB_UBOOT_IH_COMP_GZIP		1	/* gzip	 Compression Used	*/
+#define GRUB_UBOOT_IH_COMP_BZIP2		2	/* bzip2 Compression Used	*/
+#define GRUB_UBOOT_IH_COMP_LZMA		3	/* lzma  Compression Used	*/
+#define GRUB_UBOOT_IH_COMP_LZO		4	/* lzo   Compression Used	*/
+
+#define GRUB_UBOOT_IH_MAGIC	0x27051956	/* Image Magic Number		*/
+#define GRUB_UBOOT_IH_NMLEN		32	/* Image Name Length		*/
+
+/*
+ * Legacy format image header,
+ * all data in network byte order (aka natural aka bigendian).
+ */
+struct grub_uboot_image_header {
+	grub_uint32_t	ih_magic;	/* Image Header Magic Number	*/
+	grub_uint32_t	ih_hcrc;	/* Image Header CRC Checksum	*/
+	grub_uint32_t	ih_time;	/* Image Creation Timestamp	*/
+	grub_uint32_t	ih_size;	/* Image Data Size		*/
+	grub_uint32_t	ih_load;	/* Data	 Load  Address		*/
+	grub_uint32_t	ih_ep;		/* Entry Point Address		*/
+	grub_uint32_t	ih_dcrc;	/* Image Data CRC Checksum	*/
+	grub_uint8_t	ih_os;		/* Operating System		*/
+	grub_uint8_t	ih_arch;	/* CPU architecture		*/
+	grub_uint8_t	ih_type;	/* Image Type			*/
+	grub_uint8_t	ih_comp;	/* Compression Type		*/
+	grub_uint8_t	ih_name[GRUB_UBOOT_IH_NMLEN];	/* Image Name		*/
+};
+
+#endif	/* __IMAGE_H__ */

include/grub/uboot/uboot.h

@@ -0,0 +1,86 @@
+/* uboot.h - declare variables and functions for U-Boot support */
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 2013 Free Software Foundation, Inc.
+ *
+ *  GRUB is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  GRUB is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef GRUB_UBOOT_UBOOT_HEADER
+#define GRUB_UBOOT_UBOOT_HEADER	1
+
+#include <grub/types.h>
+#include <grub/dl.h>
+
+/* Functions.  */
+void grub_uboot_mm_init (void);
+void grub_uboot_init (void);
+void grub_uboot_fini (void);
+
+void grub_uboot_return (int) __attribute__ ((noreturn));
+
+grub_addr_t grub_uboot_get_real_bss_start (void);
+
+grub_err_t grub_uboot_probe_hardware (void);
+
+extern grub_addr_t EXPORT_VAR (start_of_ram);
+
+grub_uint32_t EXPORT_FUNC (grub_uboot_get_machine_type) (void);
+grub_addr_t EXPORT_FUNC (grub_uboot_get_boot_data) (void);
+
+
+/*
+ * The U-Boot API operates through a "syscall" interface, consisting of an
+ * entry point address and a set of syscall numbers. The location of this
+ * entry point is described in a structure allocated on the U-Boot heap.
+ * We scan through a defined region around the hint address passed to us
+ * from U-Boot.
+ */
+
+#define UBOOT_API_SEARCH_LEN (3 * 1024 * 1024)
+int grub_uboot_api_init (void);
+
+/*
+ * All functions below are wrappers around the uboot_syscall() function,
+ * implemented in grub-core/kern/uboot/uboot.c
+*/
+
+int  grub_uboot_getc (void);
+int  grub_uboot_tstc (void);
+void grub_uboot_putc (int c);
+void grub_uboot_puts (const char *s);
+
+void EXPORT_FUNC (grub_uboot_reset) (void);
+
+struct sys_info *grub_uboot_get_sys_info (void);
+
+void grub_uboot_udelay (grub_uint32_t usec);
+grub_uint32_t grub_uboot_get_timer (grub_uint32_t base);
+
+int EXPORT_FUNC (grub_uboot_dev_enum) (void);
+struct device_info * EXPORT_FUNC (grub_uboot_dev_get) (int index);
+int EXPORT_FUNC (grub_uboot_dev_open) (struct device_info *dev);
+int EXPORT_FUNC (grub_uboot_dev_close) (struct device_info *dev);
+int grub_uboot_dev_write (struct device_info *dev, void *buf, int *len);
+int grub_uboot_dev_read (struct device_info *dev, void *buf, grub_size_t blocks,
+			 grub_uint32_t start, grub_size_t * real_blocks);
+int EXPORT_FUNC (grub_uboot_dev_recv) (struct device_info *dev, void *buf,
+				       int size, int *real_size);
+int EXPORT_FUNC (grub_uboot_dev_send) (struct device_info *dev, void *buf,
+				       int size);
+
+char *grub_uboot_env_get (const char *name);
+void grub_uboot_env_set (const char *name, const char *value);
+
+#endif /* ! GRUB_UBOOT_UBOOT_HEADER */

util/grub-install.in

@@ -272,6 +272,8 @@ if [ x$source_directory = x ]; then
 		    target=i386-pc
 		fi
 		;;
+	    x"arm"*)
+		target="arm-uboot";;
 	    *)
 		gettext "Unable to determine your platform. Use --target." ;
 		echo	;;
@@ -291,7 +293,7 @@ if [ "${grub_modinfo_target_cpu}-${grub_modinfo_platform}" = "i386-pc" ] ; then
     if [ x$disk_module = xunspecified ]; then
 	disk_module=biosdisk
     fi
-elif [ "${grub_modinfo_platform}" = "ieee1275" ] || [ "${grub_modinfo_platform}" = "efi" ] || [ "${grub_modinfo_platform}" = "arc" ] ; then
+elif [ "${grub_modinfo_platform}" = "ieee1275" ] || [ "${grub_modinfo_platform}" = "efi" ] || [ "${grub_modinfo_platform}" = "arc" ] || [ "${grub_modinfo_platform}" = "uboot" ] ; then
     disk_module=
 else
     disk_module=native
@@ -424,6 +426,8 @@ if [ x"$grub_modinfo_platform" = xefi ]; then
 	    # expansion.
 		ia64)
 		    efi_file=BOOTIA64.EFI ;;
+		arm)
+		    efi_file=BOOTARM.EFI ;;
 	    esac
 	else
 	    # It is convenient for each architecture to have a different
@@ -438,6 +442,8 @@ if [ x"$grub_modinfo_platform" = xefi ]; then
 	 # expansion.
 		ia64)
 		    efi_file=grubia64.efi ;;
+		arm)
+		    efi_file=grubarm.efi ;;
 		*)
 		    efi_file=grub.efi ;;
 	    esac

util/grub-mkimage.c

@@ -40,6 +40,8 @@
 #include <stdlib.h>
 #include <assert.h>
 #include <grub/efi/pe32.h>
+#include <grub/uboot/image.h>
+#include <grub/arm/reloc.h>
 #include <grub/ia64/reloc.h>
 
 #define _GNU_SOURCE	1
@@ -71,7 +73,7 @@ struct image_target_desc
     IMAGE_I386_IEEE1275,
     IMAGE_LOONGSON_ELF, IMAGE_QEMU, IMAGE_PPC, IMAGE_YEELOONG_FLASH,
     IMAGE_FULOONG2F_FLASH, IMAGE_I386_PC_PXE, IMAGE_MIPS_ARC,
-    IMAGE_QEMU_MIPS_FLASH
+    IMAGE_QEMU_MIPS_FLASH, IMAGE_UBOOT
   } id;
   enum
     {
@@ -489,6 +491,46 @@ struct image_target_desc image_targets[] =
       .link_align = GRUB_KERNEL_MIPS_QEMU_MIPS_LINK_ALIGN,
       .default_compression = COMPRESSION_NONE
     },
+    {
+      .dirname = "arm-uboot",
+      .names = { "arm-uboot", NULL },
+      .voidp_sizeof = 4,
+      .bigendian = 0,
+      .id = IMAGE_UBOOT, 
+      .flags = PLATFORM_FLAGS_NONE,
+      .total_module_size = GRUB_KERNEL_ARM_UBOOT_TOTAL_MODULE_SIZE,
+      .decompressor_compressed_size = TARGET_NO_FIELD,
+      .decompressor_uncompressed_size = TARGET_NO_FIELD,
+      .decompressor_uncompressed_addr = TARGET_NO_FIELD,
+      .section_align = GRUB_KERNEL_ARM_UBOOT_MOD_ALIGN,
+      .vaddr_offset = 0,
+      .link_addr = GRUB_KERNEL_ARM_UBOOT_LINK_ADDR,
+      .elf_target = EM_ARM,
+      .mod_gap = GRUB_KERNEL_ARM_UBOOT_MOD_GAP,
+      .mod_align = GRUB_KERNEL_ARM_UBOOT_MOD_ALIGN,
+      .link_align = 4
+    },
+    {
+      .dirname = "arm-efi",
+      .names = { "arm-efi", NULL },
+      .voidp_sizeof = 4,
+      .bigendian = 0, 
+      .id = IMAGE_EFI, 
+      .flags = PLATFORM_FLAGS_NONE,
+      .total_module_size = TARGET_NO_FIELD,
+      .decompressor_compressed_size = TARGET_NO_FIELD,
+      .decompressor_uncompressed_size = TARGET_NO_FIELD,
+      .decompressor_uncompressed_addr = TARGET_NO_FIELD,
+      .section_align = GRUB_PE32_SECTION_ALIGNMENT,
+      .vaddr_offset = ALIGN_UP (GRUB_PE32_MSDOS_STUB_SIZE
+                                + GRUB_PE32_SIGNATURE_SIZE
+                                + sizeof (struct grub_pe32_coff_header)
+                                + sizeof (struct grub_pe32_optional_header)
+                                + 4 * sizeof (struct grub_pe32_section_table),
+                                GRUB_PE32_SECTION_ALIGNMENT),
+      .pe_target = GRUB_PE32_MACHINE_ARMTHUMB_MIXED,
+      .elf_target = EM_ARM,
+    },
   };
 
 #define grub_target_to_host32(x) (grub_target_to_host32_real (image_target, (x)))
@@ -1057,6 +1099,7 @@ generate_image (const char *dir, const char *prefix,
     case IMAGE_SPARC64_CDCORE:
     case IMAGE_I386_IEEE1275:
     case IMAGE_PPC:
+    case IMAGE_UBOOT:
       break;
     }
 
@@ -1496,6 +1539,42 @@ generate_image (const char *dir, const char *prefix,
       core_size = rom_size;
     }
     break;
+
+    case IMAGE_UBOOT:
+    {
+      struct grub_uboot_image_header *hdr;
+      GRUB_PROPERLY_ALIGNED_ARRAY (crc32_context, GRUB_MD_CRC32->contextsize);
+
+      hdr = xmalloc (core_size + sizeof (struct grub_uboot_image_header));
+      memcpy (hdr + 1, core_img, core_size);
+
+      memset (hdr, 0, sizeof (*hdr));
+      hdr->ih_magic = grub_cpu_to_be32_compile_time (GRUB_UBOOT_IH_MAGIC);
+      hdr->ih_time = grub_cpu_to_be32 (time (0));
+      hdr->ih_size = grub_cpu_to_be32 (core_size);
+      hdr->ih_load = grub_cpu_to_be32 (image_target->link_addr);
+      hdr->ih_ep = grub_cpu_to_be32 (image_target->link_addr);
+      hdr->ih_type = GRUB_UBOOT_IH_TYPE_KERNEL;
+      hdr->ih_os = GRUB_UBOOT_IH_OS_LINUX;
+      hdr->ih_arch = GRUB_UBOOT_IH_ARCH_ARM;
+      hdr->ih_comp = GRUB_UBOOT_IH_COMP_NONE;
+
+      GRUB_MD_CRC32->init(crc32_context);
+      GRUB_MD_CRC32->write(crc32_context, hdr + 1, core_size);
+      GRUB_MD_CRC32->final(crc32_context);
+      hdr->ih_dcrc = grub_get_unaligned32 (GRUB_MD_CRC32->read (crc32_context));
+
+      GRUB_MD_CRC32->init(crc32_context);
+      GRUB_MD_CRC32->write(crc32_context, hdr, sizeof (*hdr));
+      GRUB_MD_CRC32->final(crc32_context);
+      hdr->ih_hcrc = grub_get_unaligned32 (GRUB_MD_CRC32->read (crc32_context));
+
+      free (core_img);
+      core_img = (char *) hdr;
+      core_size += sizeof (struct grub_uboot_image_header);
+    }
+    break;
+
     case IMAGE_MIPS_ARC:
       {
 	char *ecoff_img;

util/grub-mkimagexx.c

@@ -58,6 +58,8 @@
 #error "I'm confused"
 #endif
 
+static Elf_Addr SUFFIX (entry_point);
+
 /* Relocate symbols; note that this function overwrites the symbol table.
    Return the address of a start symbol.  */
 static Elf_Addr
@@ -408,6 +410,55 @@ SUFFIX (relocate_addresses) (Elf_Ehdr *e, Elf_Shdr *sections,
 		}
 	       break;
 #endif
+#if defined(MKIMAGE_ELF32)
+	     case EM_ARM:
+	       {
+		 sym_addr += addend;
+		 sym_addr -= SUFFIX (entry_point);
+		 switch (ELF_R_TYPE (info))
+		   {
+		   case R_ARM_ABS32:
+		     {
+		       grub_util_info ("  ABS32:\toffset=%d\t(0x%08x)",
+				       (int) sym_addr, (int) sym_addr);
+		       /* Data will be naturally aligned */
+		       sym_addr += 0x400;
+		       *target = grub_host_to_target32 (grub_target_to_host32 (*target) + sym_addr);
+		     }
+		     break;
+		   case R_ARM_THM_CALL:
+		   case R_ARM_THM_JUMP24:
+		     {
+		       grub_err_t err;
+		       grub_util_info ("  THM_JUMP24:\ttarget=0x%08lx\toffset=(0x%08x)",	(unsigned long) target, sym_addr);
+		       sym_addr -= offset;
+		       /* Thumb instructions can be 16-bit aligned */
+		       err = grub_arm_reloc_thm_call ((grub_uint16_t *) target,
+						      sym_addr);
+		       if (err)
+			 grub_util_error ("%s", grub_errmsg);
+		     }
+		     break;
+		   case R_ARM_THM_JUMP19:
+		     {
+		       grub_err_t err;
+		       grub_util_info ("  THM_JUMP19:\toffset=%d\t(0x%08x)",
+				       sym_addr, sym_addr);
+		       sym_addr -= offset;
+
+		       /* Thumb instructions can be 16-bit aligned */
+		       err = grub_arm_reloc_thm_jump19 ((grub_uint16_t *) target, sym_addr);
+		       if (err)
+			 grub_util_error ("%s", grub_errmsg);
+		     }
+		     break;
+		   default:
+		     grub_util_error (_("relocation 0x%x is not implemented yet!"), ELF_R_TYPE (info));
+		     break;
+		   }
+		 break;
+	       }
+#endif /* MKIMAGE_ELF32 */
 	     default:
 	       grub_util_error ("unknown architecture type %d",
 				image_target->elf_target);
@@ -635,6 +686,41 @@ SUFFIX (make_reloc_section) (Elf_Ehdr *e, void **out,
 		  break;
 		}
 		break;
+#if defined(MKIMAGE_ELF32)
+	      case EM_ARM:
+		switch (ELF_R_TYPE (info))
+		  {
+		    /* Relative relocations do not require fixup entries. */
+		  case R_ARM_JUMP24:
+		  case R_ARM_THM_CALL:
+		  case R_ARM_THM_JUMP19:
+		  case R_ARM_THM_JUMP24:
+		    {
+		      Elf_Addr addr;
+
+		      addr = section_address + offset;
+		      grub_util_info ("  %s:  not adding fixup: 0x%08x : 0x%08x", __FUNCTION__, (unsigned int) addr, (unsigned int) current_address);
+		    }
+		    break;
+		    /* Create fixup entry for PE/COFF loader */
+		  case R_ARM_ABS32:
+		    {
+		      Elf_Addr addr;
+
+		      addr = section_address + offset;
+		      current_address
+			= SUFFIX (add_fixup_entry) (&lst,
+						    GRUB_PE32_REL_BASED_HIGHLOW,
+						    addr, 0, current_address,
+						    image_target);
+		    }
+		    break;
+		  default:
+		    grub_util_error (_("fixup for relocation 0x%x not implemented"), ELF_R_TYPE (info));
+		    break;
+		  }
+		break;
+#endif /* defined(MKIMAGE_ELF32) */
 	      default:
 		grub_util_error ("unknown machine type 0x%x", image_target->elf_target);
 	      }
@@ -945,6 +1031,8 @@ SUFFIX (load_image) (const char *kernel_path, grub_size_t *exec_size,
       if (*start == 0)
 	grub_util_error ("start symbol is not defined");
       
+      SUFFIX (entry_point) = (Elf_Addr) *start;
+
       /* Resolve addresses in the virtual address space.  */
       SUFFIX (relocate_addresses) (e, sections, section_addresses, 
 				   section_entsize,