--- Rules.mak.orig	2007-02-28 22:12:06.000000000 +0100
+++ Rules.mak	2007-07-29 05:16:13.000000000 +0200
@@ -168,6 +168,7 @@
 	CPU_CFLAGS-$(CONFIG_MIPS_ISA_3)+=-mips3 -mtune=mips3
 	CPU_CFLAGS-$(CONFIG_MIPS_ISA_4)+=-mips4 -mtune=mips4
 	CPU_CFLAGS-$(CONFIG_MIPS_ISA_MIPS32)+=-mips32 -mtune=mips32
+	CPU_CFLAGS-$(CONFIG_MIPS_ISA_MIPS32_4KC)+=-mips32 -march=4kc -mtune=4kc
 	CPU_CFLAGS-$(CONFIG_MIPS_ISA_MIPS64)+=-mips64 -mtune=mips32
 endif