Re: Applying dtb overlays on pre-compiled dtb's

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Hi Igor,

On Mon, 27 Feb 2023 at 07:26, Igor Opaniuk <igor.opaniuk@xxxxxxxxxxxx> wrote:
> Hi everyone,
> I apologize in advance for the possibly wrong ML for this question.
> I'm currently looking for any existing ways of adjusting pre-compiled device
> tree blobs. I know that dtc doesn't have such ability (and obviously its purpose
> is different), but maybe there is something you can recommend in this case
> (kind of userland analogy of U-Boot's runtime "fdt apply" cmd).
> For instance, I would like to add one property to "/firmware" (its value
>  is generated during compile time) node into multiple device tree
> blobs built with-in
> Linux/U-Boot/TF-A, avoiding any additional intrusive changes to these source
> trees (so, for example, adding dtsi with needed firmware property
> unfortunately doesn't work for me).
> The only solution I see is a custom app that uses libfdt, implemented
> specifically
> for this task, but maybe there is something which already exists.

There is fdtput which can add simple properties and nodes.

I suppose you are aware of binman[1], which might be useful if your
signing/production scheme were supported there.

> Thanks and looking forward to your replies.
> --
> Best regards - Freundliche Grüsse - Meilleures salutations
> Igor Opaniuk
> Embedded Software Engineer
> T:  +380 938364067
> E: igor.opaniuk@xxxxxxxxxxxx
> W:


 (pip install binary-manager)

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