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

[Tom Rini <trini@ti.com>]

On Fri, Aug 01, 2014 at 09:22:42PM +0900, Masahiro Yamada wrote:
> Hi.
> 
> 
> 
> On Fri, 1 Aug 2014 12:48:44 +0100
> Simon Glass <sjg@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.
> 
> 
> We can easily do
> 
> [1] Choose boards by arch
> 
>   Just grep  CONFIG_ARM=y, CONFIG_MIPS=y, CONFIG_SANDBOX=y  in defconfigs
> 
> [2] Choose boards by board name
> 
>   It is the file name of defconfigs
> 
> 
> 
> 
> My question is, do we really need to choose by CPU, Vendor, SoC ?
> I know they are useful.
> For ex. nvidia developers probably want to build only Tegra boards.

For me, I don't see CPU or Vendor as super important but SoC is.  I'll
often be doing some TI work for say am335x or am43xx and be checking
over those two board configs but once I'm done (or nearing done) I need
to build for SoC==am33xx to catch all of the other vendors that have
boards in the family.

-- 
Tom
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