[PATCH 6/6] fdtdec: apply DT overlays from bloblist

[Tom Rini]

On Mon, Jun 23, 2025 at 11:58:04AM +0200, Michal Simek wrote:
> Hi Raymond,
> 
> > > > > Isn't it also worth to check if existing CONTROL_FDT has enough space inside
> > > > > that new overlay can fit there before resizing it?
> > > > By default each entry only contains the actual size since bloblist
> > > > (aka transfer list) is designed as a compact data structure and there
> > > > should not be a waiver for CONTROL_FDT to carry additional spare
> > > > spaces.
> > > 
> > > Right but you can build dtb via dtc -S/-p to add additional padding. It means
> > > dtb will be bigger which goes to TL and should be possible to fit overlay there.
> > > 
> > Yes, a developer knows exactly how big the merged DT should be...but
> > it is only DT specific and not a common case for applying other blob
> > data.
> > Maybe I can add a DT Kconfig for skipping resizing for the use case
> > you mentioned if all reviewers agree.
> 
> What I am saying is free space calculation should start with looking at free
> space in base DTB. If it is enough (with pad) do nothing. If there is not
> enough space then call your code.

And we can configure free space at our build time now too.

-- 
Tom
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