[U-Boot] [PATCH] wandboard: add pxe support, set default boot command like highbank

[Tom Rini]

On Mon, Aug 05, 2013 at 07:29:33AM +0200, Wolfgang Denk wrote:
> Dear Rob Herring,
> 
> In message <CAL_JsqK++KbAajYtp9UnJuHWd=f8pjHSK0x3hzf73PCHdL_M6A at mail.gmail.com> you wrote:
> >
> > > Maybe can be mkenvimage a solution (tools/mkenvimage) ? It creates an
> > > environment image from a simple ASCII text. The resulting image could be
> > > concatenated together with u-boot and in CONFIG_EXTRA_ENV_SETTINGS we
> > > could have for all boards a way to load it. Only a first idea, but as we
> > > recognize the issue, any idea to solve it ?
> > 
> > I definitely agree that we should move this out of C code and support
> > standalone text files as input. IIRC, CONFIG_EXTRA_ENV_SETTINGS is
> > replaced by any separate environment. I think it also needs to support
> > being merged with a separate environment.
> 
> Why would you ever want to compile this into U-Boot at all?  Then any
> changes you need to make mean compiling and installing a new U-Boot,
> which is something you normally don't want to do.
> 
> U-Boot is perfectly able to import such settings from text files (or
> text blobs stored somewhere, even attached to the U-Boot image, if you
> want), so just use the text files separately, instead of hard
> compiling them into the code.

But we have to start _somewhere_ with a compiled-in set of defaults.
Yes, some boards are easily updatable (it's just an SD card), but on
others it's not.  And there's a strong desire on the generic distro side
(and on a lot of kernel hackers sides) to treat U-Boot as never-touch
binaries.  What ships is what's used.  So a default that tries to load
a controlable file is what started all of the boot.scr or uEnv.txt
stuff.

-- 
Tom
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