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Re: [PATCH 4/4] linux: ignore FDT unless we need to modify it

From: Leif Lindholm
Subject: Re: [PATCH 4/4] linux: ignore FDT unless we need to modify it
Date: Fri, 23 Oct 2020 14:16:04 +0100
User-agent: Mutt/1.10.1 (2018-07-13)

On Fri, Oct 23, 2020 at 15:12:50 +0200, Ard Biesheuvel wrote:
> On Fri, 23 Oct 2020 at 14:47, Leif Lindholm <> wrote:
> >
> > On Fri, Oct 23, 2020 at 14:08:25 +0200, Ard Biesheuvel wrote:
> > > Now that we implemented supported for the LoadFile2 protocol for initrd
> > > loading, there is no longer a need to pass the initrd parameters via
> > > the device tree. This means there is no longer a reason to update the
> > > device tree in the first place, and so we can ignore it entirely.
> >
> > There is a change in behaviour here which I don't think matters, but
> > I'll call it out anyway:
> > If there was ever a kernel out there with an EFI stub that depended on
> > a chosen node existing in the DT, and the one provide by firmware did
> > not contain one, that setup would break from this *if* it didn't use
> > an initrd.
> I checked the Linux source, and the original code contributed by Roy
> already contained the logic to create the /chosen node if it wants
> there already. So we should be fine here.

Excellent. Then, with this information now in a public archive for any
unfortunate souls doing anything crazy non-linux to find:

Reviewed-by: Leif Lindholm <>

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