diff -ur grub2/kern/powerpc/ieee1275/cmain.c grub2.powerpc/kern/powerpc/ieee1275/cmain.c
--- grub2/kern/powerpc/ieee1275/cmain.c	2007-12-30 09:52:05.000000000 +0100
+++ grub2.powerpc/kern/powerpc/ieee1275/cmain.c	2008-01-13 20:01:48.000000000 +0100
@@ -102,12 +102,9 @@
     }
 }
 
-void cmain (uint32_t r3, uint32_t r4, uint32_t r5);
 void
-cmain (UNUSED uint32_t r3, UNUSED uint32_t r4, uint32_t r5)
+cmain (void)
 {
-  grub_ieee1275_entry_fn = (int (*)(void *)) r5;
-
   grub_ieee1275_finddevice ("/chosen", &grub_ieee1275_chosen);
 
   grub_ieee1275_find_options ();
diff -ur grub2/kern/powerpc/ieee1275/crt0.S grub2.powerpc/kern/powerpc/ieee1275/crt0.S
--- grub2/kern/powerpc/ieee1275/crt0.S	2007-07-22 01:32:27.000000000 +0200
+++ grub2.powerpc/kern/powerpc/ieee1275/crt0.S	2008-01-13 20:01:34.000000000 +0100
@@ -38,5 +38,7 @@
 2:	stwu	2, 4(6) /* We know r2 is already 0 from above.  */
 	bdnz	2b
 
+	/* initialize EXT_C(grub_ieee1275_entry_fn) */
+
 	bl	cmain
 1:	b	1b