%_config: %_defconfig
@:
-configfiles=$(wildcard $(srctree)/kernel/configs/$@ $(srctree)/arch/$(SRCARCH)/configs/$@)
+configfiles=$(wildcard $(srctree)/kernel/configs/$@ \
+ $(srctree)/arch/$(SRCARCH)/configs/$@ \
+ $(shell find $(srctree)/board -name "$@"))
%.config: $(obj)/conf
$(if $(call configfiles),, $(error No configuration exists for this target on this architecture))