[PATCH 10/19] buildman: Incorporate the genboardscfg.py tool

Tom Rini trini at konsulko.com
Wed Jul 13 20:21:17 CEST 2022

On Wed, Jul 13, 2022 at 09:28:06AM -0600, Simon Glass wrote:
> Hi Tom,
> On Tue, 12 Jul 2022 at 15:38, Tom Rini <trini at konsulko.com> wrote:
> >
> > On Mon, Jul 11, 2022 at 07:04:04PM -0600, Simon Glass wrote:
> > > Bring this tool into buildman, so we don't have to run it separately. The
> > > board.cfg file is still produced as part of the build, to save time when
> > > doing another build in the same working directory. If it is out of date
> > > with respect to the Kconfig, it is updated.
> > >
> > > Time to regenerate on a recent single-thread machine is 4.6s (1.3s on a
> > > 32-thread machine), so we do need some sort of cache if we want buildman
> > > to be useful on incremental builds. We could use Python's pickle format
> > > but:
> > >
> > > - it seems useful to allow boards.cfg to be regenerated, at least for a
> > >   while, in case other tools use it
> > > - it is possible to grep the file easily, e.g. to find boards which use
> > >   a particular SoC (similar to 'buildman -nv <soc>'
> >
> > While I don't think other tools still use boards.cfg, this will make it
> > easier to find out that I'm wrong.  Perhaps once the CONFIG to Kconfig
> > migration is done we can move to just pickle'ing the data or similar
> > since I find the main use of what was in boards.cfg can be figured out
> > with some other git grep'ing, and in turn that's mainly for me when
> > trying to convert stuff.  Thanks for doing this.
> Yes. I'm excited to hear that Kconfig migration might be done - any
> forecast as to when?

Not yet.  I'm auditing CONFIG_SYS_* now, with a notion to move
everything that's not really configurable just out of CONFIG namespace
as the starting point.  That'll drop us down to ~500 to migrate, which
feels a bit less daunting.

> One thing we could to is provide an option for buildman to spit out
> the various fields that go into boards.cfg

Right.  So I might not have said this before, but one reason I wanted
buildman to natively know kconfiglib and have everything was that while
we can do a lot of good matching on what to build, it would be amazingly
good to be able to say "build every platform with NVME_PCI set" (and if
it's not too hard hex/int options with a specific value).

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