I'm fairly new to OpenWrt development and I have a question regarding dts(device tree) files.
I've checked that there are some folders in target/linux which consist dts files but I didn't find out how OpenWrt uses them and more specific how it compiles them and where the output dtb file is generated.
I previously knew that dtb files may be passed to kernel by bootloader or they may be appended to kernel image itself(Not sure).
I want to know which statement is correct and also which config determines this?
In the devices I've looked at,
KERNEL_DTB are used in the target makefile:
The dtb is built from here:
The build process for my devices compiles the dts files to here:
On a device which uses dts, you can normally see the device tree here (but this can be configured off):
hexdump -C /proc/device-tree/compatible
https://elinux.org/Device_Tree_Reference is a great resource.
The linux dtc utilities are very useful for investigating the dts / dtb.