cflags-$(CONFIG_CPU_VR41XX)    += -march=r4100 -Wa,--trap
 cflags-$(CONFIG_CPU_R4X00)     += -march=r4600 -Wa,--trap
 cflags-$(CONFIG_CPU_TX49XX)    += -march=r4600 -Wa,--trap
-cflags-$(CONFIG_CPU_MIPS32_R1) += $(call cc-option,-march=mips32,-mips2 -mtune=r4600) \
+cflags-$(CONFIG_CPU_MIPS32_R1) += $(call cc-option,-march=mips32,-mips32 -U_MIPS_ISA -D_MIPS_ISA=_MIPS_ISA_MIPS32) \
                        -Wa,-mips32 -Wa,--trap
-cflags-$(CONFIG_CPU_MIPS32_R2) += $(call cc-option,-march=mips32r2,-mips2 -mtune=r4600) \
+cflags-$(CONFIG_CPU_MIPS32_R2) += $(call cc-option,-march=mips32r2,-mips32r2 -U_MIPS_ISA -D_MIPS_ISA=_MIPS_ISA_MIPS32) \
                        -Wa,-mips32r2 -Wa,--trap
-cflags-$(CONFIG_CPU_MIPS64_R1) += $(call cc-option,-march=mips64,-mips2 -mtune=r4600) \
+cflags-$(CONFIG_CPU_MIPS64_R1) += $(call cc-option,-march=mips64,-mips64 -U_MIPS_ISA -D_MIPS_ISA=_MIPS_ISA_MIPS64) \
                        -Wa,-mips64 -Wa,--trap
-cflags-$(CONFIG_CPU_MIPS64_R2) += $(call cc-option,-march=mips64r2,-mips2 -mtune=r4600 ) \
+cflags-$(CONFIG_CPU_MIPS64_R2) += $(call cc-option,-march=mips64r2,-mips64r2 -U_MIPS_ISA -D_MIPS_ISA=_MIPS_ISA_MIPS64) \
                        -Wa,-mips64r2 -Wa,--trap
 cflags-$(CONFIG_CPU_R5000)     += -march=r5000 -Wa,--trap
 cflags-$(CONFIG_CPU_R5432)     += $(call cc-option,-march=r5400,-march=r5000) \