Re: [PATCH 13/14] Update u-boot.cfg to include CFG also

[Tom Rini <trini@konsulko.com>]

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On Sun, Jul 28, 2024 at 01:36:09PM -0600, Simon Glass wrote:
> Hi Tom,
> 
> On Fri, 28 Jun 2024 at 01:33, Simon Glass <sjg@chromium.org> wrote:
> >
> > Hi Tom,
> >
> > On Thu, 27 Jun 2024 at 15:42, Tom Rini <trini@konsulko.com> wrote:
> > >
> > > On Thu, Jun 27, 2024 at 09:37:15AM +0100, Simon Glass wrote:
> > > > Hi Tom,
> > > >
> > > > On Wed, 26 Jun 2024 at 15:07, Tom Rini <trini@konsulko.com> wrote:
> > > > >
> > > > > On Wed, Jun 26, 2024 at 09:00:41AM +0100, Simon Glass wrote:
> > > > > > Hi Tom,
> > > > > >
> > > > > > On Tue, 25 Jun 2024 at 15:14, Tom Rini <trini@konsulko.com> wrote:
> > > > > > >
> > > > > > > On Tue, Jun 25, 2024 at 01:38:04PM +0100, Simon Glass wrote:
> > > > > > > > Hi Tom,
> > > > > > > >
> > > > > > > > On Mon, 24 Jun 2024 at 19:29, Tom Rini <trini@konsulko.com> wrote:
> > > > > > > > >
> > > > > > > > > On Sun, Jun 23, 2024 at 02:30:32PM -0600, Simon Glass wrote:
> > > > > > > > >
> > > > > > > > > > Some configuration is now in variables with a CFG_ prefix. Add these to
> > > > > > > > > > the .cfg file so that we can see everything in one place. Sort the
> > > > > > > > > > options so they are easier to find and compare.
> > > > > > > > > >
> > > > > > > > > > Signed-off-by: Simon Glass <sjg@chromium.org>
> > > > > > > > > > ---
> > > > > > > > > >
> > > > > > > > > > Changes in v2:
> > > > > > > > > > - Add new patch to update u-boot.cfg with CFG_... options
> > > > > > > > > >
> > > > > > > > > >  scripts/Makefile.autoconf | 2 +-
> > > > > > > > > >  1 file changed, 1 insertion(+), 1 deletion(-)
> > > > > > > > > >
> > > > > > > > > > diff --git a/scripts/Makefile.autoconf b/scripts/Makefile.autoconf
> > > > > > > > > > index b42f9b525fe..65ff11ea508 100644
> > > > > > > > > > --- a/scripts/Makefile.autoconf
> > > > > > > > > > +++ b/scripts/Makefile.autoconf
> > > > > > > > > > @@ -71,7 +71,7 @@ quiet_cmd_autoconf = GEN     $@
> > > > > > > > > >  quiet_cmd_u_boot_cfg = CFG     $@
> > > > > > > > > >        cmd_u_boot_cfg = \
> > > > > > > > > >       $(CPP) $(c_flags) $2 -DDO_DEPS_ONLY -dM include/config.h > $@.tmp && { \
> > > > > > > > > > -             grep 'define CONFIG_' $@.tmp | \
> > > > > > > > > > +             egrep 'define (CONFIG_|CFG_)' $@.tmp | sort | \
> > > > > > > > > >                       sed '/define CONFIG_IS_ENABLED(/d;/define CONFIG_IF_ENABLED_INT(/d;/define CONFIG_VAL(/d;' > $@; \
> > > > > > > > > >               rm $@.tmp;                                              \
> > > > > > > > > >       } || {                                                          \
> > > > > > > > >
> > > > > > > > > I don't like this because whereas "CONFIG_" is enforced to be set only
> > > > > > > > > by Kconfig and so always all reliably set and found via a single header,
> > > > > > > > > CFG_ stuff is not.
> > > > > > > >
> > > > > > > > OK, so how are CFG_ options found? I hit this when trying to find the
> > > > > > > > SDRAM size on rockchip 3399 and I could not find any way of figuring
> > > > > > > > it out.
> > > > > > >
> > > > > > > It's just another define, there's no uniformity to it. For some of the
> > > > > > > SDRAM values really we need some build time way to grab some information
> > > > > > > out of the default device tree.
> > > > > >
> > > > > > Can you give an example of a board that could use this? I looked at
> > > > > > the devicetree for chromebook_kevin and don't see a memory range in
> > > > > > ther.
> > > > >
> > > > > OK, wow, I didn't realize /memory was optional now. But indeed, I don't
> > > > > see it in the dtb file. That removes that option then, sadly.
> > > >
> > > > Well, we can still require it, so long as an error is produced if the
> > > > property is needed but does not exist.
> > >
> > > "We" who? I don't feel like we'll have a lot of traction with linux
> > > kernel folks in requiring /memory to be added to the dts files on
> > > however many platforms don't have it today because I'm going to guess
> > > it's added at run time, possibly by us, with the correct size and we'd
> > > be asking for statically adding things half-wrong like a lot of
> > > platforms used to do (and in turn rely on U-Boot to correct the size).
> >
> > Hmm yes of course, the firmware is supposed to add these
> > properties...that's how it gets in there. So we need to stick with CFG
> > (and perhaps the RAM-size prober) for now.
> 
> Coming back to this patch, can we apply it? It provides a way to find
> out the value of these CFG options, which otherwise involves chasing
> around header files.

No, because it implies that there's a consistent way to know what a
given CFG value will be when there is not. There is no equivalent header
to include like for CONFIG symbols to know that you got them. You're
likely better off trying out "ripgrep" which I have found to be much
faster than "git grep".

-- 
Tom

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