diff --git a/target/Config.in.arch b/target/Config.in.arch
index e7aec56af8..75c5499ff9 100644
--- a/target/Config.in.arch
+++ b/target/Config.in.arch
@@ -900,16 +900,12 @@ config BR2_GCC_TARGET_ARCH
 config BR2_GCC_TARGET_ABI
 	string
 	default apcs-gnu	if BR2_ARM_OABI
-	default atpcs		if BR2_arm_dunno
-	default aapcs		if BR2_arm_dunno
 	default aapcs-linux	if BR2_ARM_EABI
 	default 32		if BR2_MIPS_OABI32
 	default n32		if BR2_MIPS_ABI32
 	default eabi		if BR2_MIPS_EABI
 	default o64		if BR2_MIPS_OABI64
 	default 64		if BR2_MIPS_ABI64
-	default mmixware	if BR2_mmix && BR2_MMIX_ABI_native
-	default gnu		if BR2_mmix && !BR2_MMIX_ABI_native
 	default altivec		if BR2_powerpc && BR2_PPC_ABI_altivec
 	default no-altivec	if BR2_powerpc && BR2_PPC_ABI_no-altivec
 	default spe		if BR2_powerpc && BR2_PPC_ABI_spe