[PATCH] ppc32: Fix building 32bit kernel for 64bit machines

When building a ppc32 MULTIPLATFORM kernel for a 64bit pmac, we try and
build certain files or use certain functions that make no sense in that
context.  This catches the last of these.

Signed-off-by: Tom Rini <trini@kernel.crashing.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
diff --git a/arch/ppc/boot/simple/Makefile b/arch/ppc/boot/simple/Makefile
index d8d801f..c28061a 100644
--- a/arch/ppc/boot/simple/Makefile
+++ b/arch/ppc/boot/simple/Makefile
@@ -123,10 +123,13 @@
          end-$(pcore)			:= pcore
    cacheflag-$(pcore)			:= -include $(clear_L2_L3)
 
+# Really only valid if CONFIG_6xx=y
       zimage-$(CONFIG_PPC_PREP)		:= zImage-PPLUS
 zimageinitrd-$(CONFIG_PPC_PREP)		:= zImage.initrd-PPLUS
+ifeq ($(CONFIG_6xx),y)
      extra.o-$(CONFIG_PPC_PREP)		:= prepmap.o
         misc-$(CONFIG_PPC_PREP)		+= misc-prep.o mpc10x_memory.o
+endif
          end-$(CONFIG_PPC_PREP)		:= prep
 
          end-$(CONFIG_SANDPOINT)	:= sandpoint