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Device tree support for x86 on Linux

From: Mislav Stublić
Subject: Device tree support for x86 on Linux
Date: Thu, 29 Jul 2021 08:43:45 +0000


I am planning to add support for device tree loading on x86 with
UEFI and Linux as i understand this is currently not supported. We need
this for a board we are developing so i would test my patches in our
development environment.

I have gone through current x86 loader code and some similar use cases
so i  believe i could provide a patch but i also have some questions.

Is this a feature you would accept upstream?

As for technical questions, for this to work grub would need to set
setup_data pointer (part of setup_header for linux kernel) that points
to memory holding loaded dtb. But i'm not sure if such memory can
just be allocated with grub_zalloc or is there some other allocation
mechanism that would guarantee this will be preserved once control is
handed over to linux kernel.


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