--- Rules.mak
+++ Rules.mak
@@ -358,6 +358,9 @@
 
 ifeq ($(TARGET_ARCH),mips)
 	OPTIMIZATION+=-mno-split-addresses
+ifneq ($(strip $(MIPS_CUSTOM_ARCH_CPU_CFLAGS)),)
+	CPU_CFLAGS-y+=$(strip $(MIPS_CUSTOM_ARCH_CPU_CFLAGS))
+else
 	CPU_CFLAGS-$(CONFIG_MIPS_ISA_1)+=-mips1
 	CPU_CFLAGS-$(CONFIG_MIPS_ISA_2)+=-mips2 -mtune=mips2
 	CPU_CFLAGS-$(CONFIG_MIPS_ISA_3)+=-mips3 -mtune=mips3
@@ -365,6 +368,7 @@
 	CPU_CFLAGS-$(CONFIG_MIPS_ISA_MIPS32)+=-mips32 -mtune=mips32
 	CPU_CFLAGS-$(CONFIG_MIPS_ISA_MIPS32R2)+=-march=mips32r2 -mtune=mips32r2
 	CPU_CFLAGS-$(CONFIG_MIPS_ISA_MIPS64)+=-mips64 -mtune=mips32
+endif
 	ifeq ($(strip $(ARCH_BIG_ENDIAN)),y)
 		CPU_LDFLAGS-$(CONFIG_MIPS_N64_ABI)+=-Wl,-melf64btsmip
 		CPU_LDFLAGS-$(CONFIG_MIPS_O32_ABI)+=-Wl,-melf32btsmip