sub-dirs := $(shell find -L $(SDK_DIR)/source/drivers -maxdepth 2 -mindepth 1 -name Makefile)
$(info bootloader drivers: $(subst Makefile,,$(subst $(SDK_DIR)/source/drivers/,,$(sub-dirs))))
obj-y += $(subst Makefile,,$(subst $(SDK_DIR)/source/drivers/,,$(sub-dirs)))

obj- += dummy.o