sparc32: Fix tftpboot.img Makefile

Signed-off-by: Julian Calaby <julian.calaby@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/arch/sparc/boot/Makefile b/arch/sparc/boot/Makefile
index 5e2caeb..500a2f8 100644
--- a/arch/sparc/boot/Makefile
+++ b/arch/sparc/boot/Makefile
@@ -15,7 +15,7 @@
 
 ifeq ($(CONFIG_SPARC32),y)
 quiet_cmd_piggy		= PIGGY   $@
-      cmd_piggy		= $(obj)/piggyback_32 $@ $(obj)/System.map $(ROOT_IMG)
+      cmd_piggy		= $(obj)/piggyback_32 $@ System.map $(ROOT_IMG)
 quiet_cmd_btfix		= BTFIX   $@
       cmd_btfix		= $(OBJDUMP) -x vmlinux | $(obj)/btfixupprep > $@
 quiet_cmd_sysmap        = SYSMAP  $(obj)/System.map
@@ -58,7 +58,7 @@
 $(obj)/zImage: $(obj)/image
 	$(call if_changed,strip)
 
-$(obj)/tftpboot.img: $(obj)/piggyback_32 $(obj)/System.map $(obj)/image FORCE
+$(obj)/tftpboot.img: $(obj)/piggyback_32 System.map $(ROOT_IMG) FORCE
 	$(call if_changed,elftoaout)
 	$(call if_changed,piggy)