[U-Boot] Removing the need for boards.cfg

[Tom Rini <trini@ti.com>]

On Sun, Aug 10, 2014 at 08:22:35PM -0600, Simon Glass wrote:
> Hi Tom,
> 
> On 8 August 2014 07:04, Tom Rini <trini@ti.com> wrote:
> > On Fri, Aug 01, 2014 at 12:48:44PM +0100, Simon Glass wrote:
> >
> >> Hi,
> >>
> >> At present, as a work-around, we generate boards.cfg if needed. This
> >> is quite a slow process since each board config must be fully
> >> processed.
> >>
> >> What can we do to improve this? We only need a small number of options
> >> in order to start buildman - things like CONFIG_SYS_ARCH,
> >> CONFIG_SYS_CPU, etc.
> >>
> >> I wonder if we could run a script which adds these to the defconfigs
> >> for each board and then apply a patch to mainline? Would that require
> >> removing the options from the config.h files? Or could we do that
> >> later as a separate step?
> >
> > I wonder (and I haven't had my coffee nor dug into this much more yet)
> > about using say https://github.com/ulfalizer/Kconfiglib to have buildman
> > parse all configs/ and then use that information to build what's been
> > asked (depending on how long the reading+parsing takes).  If it's
> > relatively quick, that would be a big argument in favour of dropping
> > MAKEALL.
> 
> Well I've had my wine but it seems to parse the Kconfig files rather
> than the #includes that are part of U-Boot's system. Unless I'm
> missing something, we would still need to find out things like the CPU
> type, even with that tool.

Well, my thought was:
foreach Kconfig file, read to build state machine
foreach defconfig, evaluate config, spl/config, tpl/config, store object

Now we can poke those objects for everything with CONFIG_SYS_CPU
whatever, and so forth.  Or maybe that all takes longer than what we do
today.

-- 
Tom
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