Rock3/Ubuntu/device-tree-overlays
ROCK 3 > Ubuntu > Device Tree Overlays
Device Tree Overlays
Introduction
This page discribes device tree overlays on ROCK 3. Device tree overlays is controlled by file /boot/uEnv.txt. You can do the setting for ROCK 3 in your /boot/uEnv.txt, which should cause your ROCK 3 to do your wanted things after a reboot.
In /boot/dtbs/`uname -r`/rockchip/overlay/ you will find many *.dtbo files. The loader will merge the selected *.dtbo files by reading the file /boot/uEnv.txt.