[PATCH v2 48/71] bootstd: Support reading the device tree with EFI

Simon Glass sjg at chromium.org
Fri Jan 13 19:00:29 CET 2023

Hi Mark,

On Sun, 8 Jan 2023 at 03:25, Mark Kettenis <mark.kettenis at xs4all.nl> wrote:
> > From: Simon Glass <sjg at chromium.org>
> > Date: Sat,  7 Jan 2023 19:50:24 -0700
> >
> > With EFI booting the device tree is required but is not actually specified
> > in any way. The normal method is to use a fdtfile environment variable to
> > get the filename, then look for that file on the media.
> >
> > Implement this in the bootmeth.
> >
> > Signed-off-by: Simon Glass <sjg at chromium.org>
> > ---
> Hi Simon,
> The distroboot scripts also reads dtb files from the root directory of
> the ESP (so without the "dtb/" prefix).  This code needs to do that as
> well otherwise some folks will run with a different device tree after
> switching to bootstd.
> The construction of a fallback dtb filename based on soc, board and
> boardver is only done for (32-bit) arm and not for arm64.  It isn't
> done for riscv either.  That feels to me like someone recognized that
> was a bit of a mistake and shouldn't be done for modern targets.  So I
> think that code should be under the same
>    #if defined(CONFIG_ARM) && !defined(CONFIG_ARM64)
> as it is now in config_distro_bootcmd.h.

OK, thanks for that. Yes I deliberately dropped that in the hope that
we can have one standard.

I will send a patch to add that.


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