patches to allow DTB to be appended to the ARM zImage
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Cover letter [PATCH 0/3] patches to allow DTB to be appended to the ARM zImage
Quoted 11 lines · Russell King - ARM Linux
Quoted 4 lines · Arnd Bergmann
Of course it should override the device tree, I'm not arguing that. All I'm saying is that we don't need to special-case this or support both formats once the kernel is there as long as we move the information into appropriate DT-representation of the same data.
You're arguing for it to be parsed by whatever fragment of assembly code we have to place around the zImage to merge it into DT.
And yes, it's going to have to be assembly code because we don't have a C environment at that point which can run in a relocatable way.
Please, again look at the cuboot stuff which is used on powerpc. It uses limited C environment: it's executed before kernel entry, so it can use stack, etc. as setup by the bootloader.
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With best wishes Dmitry