--- Rules.mak	2006-10-07 12:21:39.000000000 +0000
+++ Rules.mak	2006-10-07 16:16:37.000000000 +0000
@@ -167,6 +169,7 @@
 	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