From 2f2a3442573c97dd3cf60378c7acaf25894cec98 Mon Sep 17 00:00:00 2001
From: robertmh <robertmh@localhost>
Date: Fri, 14 Nov 2008 20:18:07 +0000
Subject: [PATCH] 	Add #error instance with comment to explain why this  
       loader isn't currently usable on PC/BIOS.

---
 ChangeLog           | 3 ++-
 loader/i386/linux.c | 7 +++++++
 2 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/ChangeLog b/ChangeLog
index 834efaca0..c3bbea91d 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -14,7 +14,8 @@
 	an appropiate place in lower memory, between 0x10000 and 0x90000,
 	like loader/i386/efi/linux.c does.  Linux often panics if real_mode_mem
 	is in our heap (probably as a result of it being corrupted during
-	decompression).
+	decompression).  Add #error instance with comment to explain why this
+	loader isn't currently usable on PC/BIOS.
 
 2008-11-14  Robert Millan  <rmh@aybabtu.com>
 
diff --git a/loader/i386/linux.c b/loader/i386/linux.c
index 333b9d6e7..085f1f1fa 100644
--- a/loader/i386/linux.c
+++ b/loader/i386/linux.c
@@ -17,6 +17,7 @@
  */
 
 #include <grub/loader.h>
+#include <grub/machine/machine.h>
 #include <grub/machine/memory.h>
 #include <grub/machine/loader.h>
 #include <grub/file.h>
@@ -142,6 +143,12 @@ allocate_pages (grub_size_t prot_size)
   real_mode_mem = 0;
   prot_mode_mem = 0;
   
+  /* i386-pc port adds lower memory to heap, which collides with
+     `real_mode_mem' allocation below.  */
+#ifdef GRUB_MACHINE_PCBIOS
+#error
+#endif
+
   auto int NESTED_FUNC_ATTR hook (grub_uint64_t, grub_uint64_t, grub_uint32_t);
   int NESTED_FUNC_ATTR hook (grub_uint64_t addr, grub_uint64_t size, grub_uint32_t type)
     {