[PATCH v4] fdt: Allow the devicetree to come from a bloblist

[Ilias Apalodimas]

Hi Tom,

On Tue, 26 Dec 2023 at 14:07, Tom Rini <trini at konsulko.com> wrote:
>
> On Tue, Dec 26, 2023 at 09:46:25AM +0000, Simon Glass wrote:
>
> > Standard passage provides for a bloblist to be passed from one firmware
> > phase to the next. That can be used to pass the devicetree along as well.
> > Add an option to support this.
> >
> > Tests for this will be added as part of the Universal Payload work.
> >
> > Signed-off-by: Simon Glass <sjg at chromium.org>
> > ---
> > The discussion on this was not resolved and is now important due to the
> > bloblist series from Raymond. So I am sending it again since I believe
> > this is a better starting point than building on OF_BOARD
>
> I really don't like adding another option for "DT is given to us". Why
> isn't adding another enum to fdt_source_t sufficient, and if we have
> bloblist enabled, that will look for and use if found? Maybe some other
> code needs to be restructured and cleaned up too?

Same here. On top of that the bloblist has a few items in there, e.g a
TPM eventlog. What are we going to do? Add a Kconfig for each item?

This has been going back and forth for a while. I've lost count of how
many times I repeated the same proposal, but here it goes again. We
have OF_BOARD and BLOBLIST options. The bloblist and its properties
are scannable at runtime. Can't we use the combination of these 2 can
be used to imply we expect things from a bloblist. If we want to be
stricter in the future and explicitly expect the DT from a bloblist,
we could add a Kconfig option failing the boot if that's missing.

Thanks
/Ilias
>
> --
> Tom