I have enabled the device tree overlay features in the kernel. Now I don't where i write the overlay device tree content. Can someone let me know regarding this?
Problems regarding device tree overlay
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You can theoretically write your
.dtsfile wherever you want, provided you have the proper kernel sources, cross-compilation toolchain anddtcset up.In practice you'd grab a copy of the kernel sources (ideally from the vendor of your SoC if that exists), then write the .dts file inside
arch/arm[64]/boot/dts/[vendor]/overlay/$filename.dts. Then add it to theMakefilewhich you can find insidearch/arm[64]/boot/dts/[vendor]/overlay. This will allow you to compile thedtsfile to adtbofile by runningmake dtbsfrom the root of the kernel source.Once you have a
.dtbo, copy it to/boot/dtbs/[kernel-version]/[vendor]/[overlay]/, then add it to whatever configuration file gets used by your distribution to load overlays at boot-time. (For Raspberry-Pi it's/boot/config.txt, fordebos, it's/boot/uEnv.txt)