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

Steve McIntyre
2020-03-31T01:04:07Z

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@gibson.dropbear.id.au>
>> > 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?

Cheers,
--
Steve McIntyre steve.mcintyre@linaro.org
<http://www.linaro.org/> Linaro.org | Open source software for ARM SoCs