Re: [PATCH V5 5/5] of: unittest: Statically apply overlays using fdtoverlay

From: David Gibson
Date: Thu Jan 21 2021 - 01:44:59 EST

On Thu, Jan 21, 2021 at 11:20:40AM +0530, Viresh Kumar wrote:
> On 20-01-21, 23:45, Frank Rowand wrote:
> > I have only the most surface knowledge of fdtoverlay, mostly from
> > "fdtoverlay --help", but you can apply multiple overlays with a
> > single invocation of fdtoverlay. My _assumption_ was that the
> > overlays would be applied in order, and after any given overlay
> > was applied, subsequent overlays could reference the previously
> > applied overlay.
> >
> > Is my assumption incorrect?
> I think yes, if everything is in order then it should work just fine.
> I was only suggesting that fdtoverlay accepting the base overlay with
> /plugin/; may well be a requirement and so intentionally done.

No. It's simply the result of the fact that a dtbo is still a dtb.
So, you can still apply an overlay to it. However, a dtbo is a
weirdly structured dtb, so applying an overlay to it is very unlikely
to give you something useful.

David Gibson | I'll have my music baroque, and my code
david AT | minimalist, thank you. NOT _the_ _other_
| _way_ _around_!

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