diff -urN grub2.org/kern/powerpc/ieee1275/init.c grub2/kern/powerpc/ieee1275/init.c
--- grub2.org/kern/powerpc/ieee1275/init.c	2007-10-03 16:34:07.091425889 +0200
+++ grub2/kern/powerpc/ieee1275/init.c	2007-10-03 14:27:39.000000000 +0200
@@ -34,7 +34,7 @@
 #include <grub/ieee1275/ieee1275.h>
 
 /* The minimal heap size we can live with. */
-#define HEAP_MIN_SIZE		(unsigned long) (2 * 1024 * 1024)
+#define HEAP_MIN_SIZE		(unsigned long) (3 * 1024 * 1024)
 
 /* The maximum heap size we're going to claim */
 #define HEAP_MAX_SIZE		(unsigned long) (4 * 1024 * 1024)
@@ -43,6 +43,11 @@
    seems to cause relocation problems with OSes that link at 4 MiB */
 #define HEAP_MAX_ADDR		(unsigned long) (4 * 1024 * 1024)
 
+/* Try to claim heap from static address before use grub_available_iterate
+   to help broken firmwares. */
+#define HEAP_STATIC_SIZE	(unsigned long) (4 * 1024 * 1024)
+#define HEAP_STATIC_ADDR	(unsigned long) (28 * 1024 * 1024)
+
 extern char _start[];
 extern char _end[];
 
@@ -157,6 +162,16 @@
     return 0;
   }
 
+  /* Firmware not always mark our executable as claimed */
+  grub_ieee1275_claim ((unsigned long) _start, _end - _start, 0, 0);
+
+  /* Try with static heap addr first */
+  if (grub_claimmap (HEAP_STATIC_ADDR, HEAP_STATIC_SIZE) == 0)
+    {
+      grub_mm_init_region ((void *) (grub_addr_t) HEAP_STATIC_ADDR, HEAP_STATIC_SIZE);
+      return;
+    }
+
   grub_available_iterate (heap_init);
 }