U-Boot/UKI Relationship Regarding Multiple DTBs

[Tom Rini]

On Mon, Apr 08, 2024 at 11:41:10AM -0500, vindicator wrote:

> Is u-boot capable of selecting the correct DTB in a UKI during boot?
> 
> I saw "doc/README.multi-dtb-fit", which at least somewhat addresses
> what I'm looking for I think, but I'm not sure if that will relate
> directly with executing a UKI that has multiple DTBs...
> 
> For my one board, I was working on building a workable "tinyconfig"
> kernel, but then also had the thought to maybe also build another
> "allyesconfig" kernel (one time) so I can figure out everything that
> gets used for ANY board (supported for $ARCH).
> Then another thought came after that, that maybe I could pile in all
> of the DTBs the kernel supports into a UKI (via "ukify"), which is
> where I came across https://github.com/systemd/systemd/issues/31946
> (convenient timing being so recent).
> 
> So it looks like my thinking is "doable", but just hasn't been done
> yet in "ukify", and I'd thought I'd check here if there's anything
> that needs to be done from u-boot's end as well.

Sorry for the delay in replying here. Yes, it's possible to have U-Boot
select the appropriate device tree in a FIT image that contains multiple
device trees.

-- 
Tom
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