Re: [RFC PATCH v2 0/4] Add device tree build information

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Hi Steeve

On 3/31/20 3:03 AM, Steve McIntyre wrote:
Hi Alexandre,

On Mon, Mar 02, 2020 at 01:55:55PM +0100, Alexandre Torgue wrote:
On 2/28/20 6:47 PM, Frank Rowand wrote:
This would require modifying every single main .dts file to get the build info
I would prefer the method that Ian and David came up with (sorry, no lore link,
it did not go to lkml).  Extract from David's email:

     Date:   Tue, 21 Jan 2020 13:05:25 +1100
     From:   David Gibson <david@xxxxxxxxxxxxxxxxxxxxx>
     Subject: Re: [RFC PATCH 1/3] dtc: Add dtb build information option

     > Given that dts files are run through the C preprocessor before being
     > fed to dtc, the build script could use the '-include' flag to force-
     > include a fragment containing generated build info without any need to
     > modify existing dts files.

     Uh... maybe.  -include will essentially prepend the forced file, which
     is a bit awkward for our purposes.  It means that the prepended file
     would need the /dts-v1/ tag, and we couldn't have it in the main files
     which would be a bit confusing.  I think it would also cause problems
     with any /memreserve/ tags and means that the main tree could in
     theory overwrite the build information which we don't necessarily
     want.

     I guess we could build things the other way around: have the main .dts
     file specified with -include and have the dts on the dtc commandline
     be a fixed one with the build information.  It'd be a little weird,
     though.

-Frank

Yes. I try briefly this idea but I got issues with dts-v1 tag. I agree, it is
cleaner to not modify input dts file. I can rework int this way.

Have you made any progress on this please?

Unfortunately no. I cook something locally but not yet upstream-able.
Due to project issue I didn't find time to work on it. I think (I hope) to be less busy next week and so I'll restart it.

regards
alex


Cheers,




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