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How does the kernel knows which of the many possible device trees describes my hardware? Or is the system comes with custom-compiled pre-installed Linux kernel,
by Joker_vD 3y ago
How does the kernel knows which of the many possible device trees describes my hardware? Or is the system comes with custom-compiled pre-installed Linux kernel, with the one correct DT baked into it by the manufacturer?
- surajrmal 3y agoARM devices almost always need custom kernels. Even if you had device tree provided to you, there isn't a lot of confidence the kernel will be able to perfectly parse it nor have all the necessary drivers. This isn't an arm specific issue but rather an ecosystem issue as no one drives standardization.
- NewJazz 3y agoU-Boot or something else tells the kernel which DT to use, and gives its own DT to the kernel. If Linux has its own DT for the hardware, it will use that. Otherwise it falls back to what the bootloader provided.