1dts-dirs += amd 2dts-dirs += apm 3dts-dirs += arm 4dts-dirs += cavium 5dts-dirs += exynos 6dts-dirs += freescale 7dts-dirs += mediatek 8 9always := $(dtb-y) 10subdir-y := $(dts-dirs) 11clean-files := *.dtb 12