--- linux.prev/arch/powerpc/Makefile	2006-07-19 22:07:46.000000000 +0200
+++ linux/arch/powerpc/Makefile	2006-08-05 13:33:26.000000000 +0200
@@ -33,7 +33,15 @@
 
 export CROSS32CC CROSS32AS CROSS32LD CROSS32OBJCOPY
 
-KBUILD_DEFCONFIG := $(shell uname -m)_defconfig
+ifeq ($(CROSS_COMPILE),)
+KBUILD_DEFCONFIG := $(shell uname -m | sed -e s/^ppc$/pmac32/ )_defconfig
+else
+ifneq ($(findstring 64,$(CROSS_COMPILE)),)
+KBUILD_DEFCONFIG := ppc64_defconfig
+else
+KBUILD_DEFCONFIG := pmac32_defconfig
+endif
+endif
 
 ifeq ($(CONFIG_PPC64),y)
 OLDARCH	:= ppc64