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Module allows userspace to apply some random Device Tree Overlay.

Compilation
===========

$ export ACH=arm
$ export CROSS_COMPILE=arm-linux-gnueabihf-
$ make -C ../linux M=$PWD

Usage
=====

# insmod debugfs_overlay.ko

Once module is loaded it will create overlay directory under /sys/kernel/debug
with dtb writable file inside. One applies specific overlay by writing it
to dtb:

# cat fragment.dtb > /sys/kernel/debug/overlay/dtb

Writing some random bytes to dtb removes previously applied overlay:

# echo "" > /sys/kernel/debug/overlay/dtb

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