[PATCH] powerpc: Add CONFIG_DEFAULT_UIMAGE for embedded boards

Embedded boards that u-boot require a kernel image in the uImage format.
This allows a given board to specify it wants a uImage built by default.

This also fixes a warning at config time, as this symbol is referred
to in arch/powerpc/platforms/83xx/Kconfig.

Signed-off-by: Kumar Gala <[e-mail]>
Signed-off-by: Paul Mackerras <[e-mail]>

arch/powerpc/Kconfig

···
 	default y if PPC32 && SMP
 	default n
 
+config DEFAULT_UIMAGE
+	bool
+	help
+	  Used to allow a board to specify it wants a uImage built by default
+	default n
+
 menu "Processor support"
 choice
 	prompt "Processor Type"

arch/powerpc/Makefile

···
 # Default to zImage, override when needed
 defaultimage-y			:= zImage
 defaultimage-$(CONFIG_PPC_ISERIES) := vmlinux
+defaultimage-$(CONFIG_DEFAULT_UIMAGE) := uImage
 KBUILD_IMAGE := $(defaultimage-y)
 all: $(KBUILD_IMAGE)