Add support for STX GP3SSA (stxssa) Board with 4 MiB flash.

Signed-off-by: Wolfgang Denk <wd@denx.de>
diff --git a/Makefile b/Makefile
index 2fe9a46..356fb91 100644
--- a/Makefile
+++ b/Makefile
@@ -1771,8 +1771,16 @@
 stxgp3_config:		unconfig
 	@$(MKCONFIG) $(@:_config=) ppc mpc85xx stxgp3
 
-stxssa_config:		unconfig
-	@$(MKCONFIG) $(@:_config=) ppc mpc85xx stxssa
+stxssa_config		\
+stxssa_4M_config:	unconfig
+	@mkdir -p $(obj)include
+	@if [ "$(findstring _4M_,$@)" ] ; then \
+		echo "#define CONFIG_STXSSA_4M" >>$(obj)include/config.h ; \
+		echo "... with 4 MiB flash memory" ; \
+	else \
+		>$(obj)include/config.h ; \
+	fi
+	@$(MKCONFIG) -a stxssa ppc mpc85xx stxssa
 
 TQM8540_config		\
 TQM8541_config		\