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Overview
How hierarachical device files with respect to Yocto Project.
beaglebone.conf
As an example, Poky's beaglebone.conf file, which specifies the creation of three related .dtb files:
...
KERNEL_IMAGETYPE = "zImage"
KERNEL_DEVICETREE = "am335x-bone.dtb am335x-boneblack.dtb am335x-bonegreen.dtb"
KERNEL_EXTRA_ARGS += "LOADADDR=${UBOOT_ENTRYPOINT}"
...