95 lines
4.8 KiB
Text
95 lines
4.8 KiB
Text
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SUBMIT BUG REPORTS HERE --> http://sourceforge.net/tracker/?group_id=91879&atid=598709
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IMPORTANT NOTE FOR BUILDS ON ALL ARCHS:
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-------------------------
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You will need the following toolchain to build elilo with the 3.7 source tarball
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(for all archs due to the new uefi call wrappers).
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1. gnu-efi-3.0d or > .... http://sourceforge.net/project/showfiles.php?group_id=163609&package_id=185019&release_id=508306
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2. gcc-4.1.1 or >
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3. binutils-2.17.50.0.14 or > with Intel64 EFI support
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*BuildNote: efi libraries are installed to /usr/local/lib
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by the default gnu-efi source package. elilo expects them to
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be in standard linux system location /usr/lib. efi includes
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may be located in /usr/local/include/efi. elilo expects
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them to be in standard linux system location /usr/include/efi.
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likewise objcopy may be installed to /usr/local/bin by binutils,
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elilo source expects it to be in /usr/bin. On distributions
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using standard linux system conventions such
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as Debian and Ubuntu this is corrected in the binutils and gnu-efi packages.
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Implementation:
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--------------
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Calls to EFI services in x86_64 require a wrapper to pass the arguments
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in the appropriate manner. This is implemented with efi wrapper.
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For IA32 and IA64, the wrapper is a macro that merely calls the
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EFI services directly. The elilo source has been modified to use the
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efi wrapper implemented in the gnu-efi-3.0d library.
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elilo for x86_64 and its dependent libraries are built and the final
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ELF image is converted into PE-COFF image using the objcopy supported
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by binutils-2.17.50.0.14 or above with Intel64 EFI support.
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On UEFI 2.0 firmware, only Graphics Output Protocol (GOP) is supported.
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The x86_64 elilo first queries video information from GOP failing which
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it queries for text mode support. The video information is passed to
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Linux kernel via boot parameter. The GOP support requires
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Linux kernel EFI framebuffer driver (kernel configuration option).
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Booting on EFI/x86_64 platforms
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-----------------------------
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To use elilo on x86_64, you can put it on a floppy and
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on a FAT32 partition (msdos partition). You can also
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netboot if your network adapter has support for UNDI/PXE.
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Elilo/x86_64 requires efi64 enabled linux kernel (> 2.6.21).
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You need to compile the kernel with CONFIG_EFI option.
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x86_64 platforms with UEFI 2.0 firmware deprecate UGA protocol
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and therefore only the Graphics Output Protocol (GOP) is supported. For
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such platforms, the kernel must be configured with EFI_FB option. This
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will enable early boot messages on the console. The elilo for x86_64
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attempts to query the firmware for GOP and if it fails it defaults to
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text mode.
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The x86_64 implementation converts the EFI memory map into E820 map and
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passes it in the bootparameter supplied to the kernel. For details on
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bootparameter, see x86_64/sysdeps.h.
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CHANGES BETWEEN 3.6 & 3.8
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-------------------------
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- options parsing changed to append root= after append="-- options" to
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accomodate xen ia64 support. without this change the option is
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passed to the hypervisor instead of the kernel resulting in the
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standard kernel panic.
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INTEL PATCHES
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- E820 memory map is added to IA32 to make it possible for
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Linux kernel not to depend on EFI memory map on EFI 32.
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- The EFI framebuffer type ID is changed in Linux kernel to
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conform to Linux kernel framebuffer type ID grouping rules. So the
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EFI framebuffer type ID setting code in ELILO is changed accordingly.
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- The boot loader signature of IA32 and x86_64 is redefined to
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make it possible for Linux kernel to distinguish whether the
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underlying firmware is EFI 32 or EFI 64.
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- updates for EFI-2.0 boot support going into linux kernel 2.6.24-rc4
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- CL_MAGIC is not supported by 32-bit boot protocol. So, the kernel
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command line passing code is changed accordingly.
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- bugfix, on some machines efi memmap entries exceed the 128 maximum
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for e820 map entries, so consecutive memmap entries with the same
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type are merged to bring the count below 128.
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- bugfix, uninitialized e820 _nr_map in fill_e820map.
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- fixed compile warning for cmdline_addr assignment.
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ADDITIONAL CHANGES
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- version string updated to 3.8
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- fixed x86_64 hang created by initrd images larger than 7mb due
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to the code always using the same efi region which on some machines
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is only 7mb. code changed to properly have the efi allocator decide
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which regions to use based on the total pagecount required by the
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size of the initrd to be loaded.
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- bugfix, for ia32 and x86_64 code, e820_map[x-1] accesses memory
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out of bounds when x=0.
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