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

[Tom Rini]

On Fri, Aug 08, 2014 at 05:06:03AM -0600, Simon Glass wrote:
> Hi Masahiro,
> 
> On 1 August 2014 06:22, Masahiro Yamada <yamada.m at jp.panasonic.com> wrote:
> > Hi.
> >
> >
> >
> > On Fri, 1 Aug 2014 12:48:44 +0100
> > Simon Glass <sjg at chromium.org> 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?
> >>
> >
> >
> > We cannot add CONFIG_SYS_ARCH, CONFIG_SYS_CPU, etc. to defconfigs
> > because they are not user-editable options.
> > (They must be always selected in correct combination.)
> >
> > This is already discussed when I posted the RFC version of the Kconfig series.
> 
> My understanding is that if you have a 'select' option in Kconfig then
> it will be selected always, but it will still appear in the defconfig.
> I think that is the way the kernel works. So there are options that
> cannot be changed, and don't appear in the menu, but they are selected
> just the same.

Maybe we came up with the wrong answer during RFC on Kconfig then.  It's
good if selecting say CONFIG_TARGET_AM335X_EVM results in
CONFIG_SYS_ARCH="arm", CONFIG_SYS_CPU="armv7", etc.

I _think_ the problem here is what I ran into with doing CONS_INDEX
patches.  You cannot do 'select SYS_CPU="armv7"'.  So we would instead
need to get rid of CONFIG_SYS_CPU and instead do CONFIG_SYS_CPU_ARMV7,
etc, etc.

-- 
Tom
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