[U-Boot] OMAP 3530 - BeagleBoard Rev. C4

[Tom Rini]

On Wed, May 04, 2016 at 10:45:09PM -0500, Derald D. Woods wrote:

> Hi Tom,
> 
> Is anyone still attempting to boot the OMAP 3530 BeagleBoard with
> U-Boot master?

Yes, but...

> In order to boot my BeagleBoard Rev. C4, I need to basically
> undefine CONFIG_SPL_EXT_SUPPORT and CONFIG_SYS_THUMB_BUILD.
> 
> There is some background in this old thread from last year:
> - http://lists.denx.de/pipermail/u-boot/2015-July/220332.html
> 
> The thread ended without an apparent solution.
> 
> What does work is this patch from EEWiki:
> - https://github.com/eewiki/u-boot-patches/blob/master/v2016.03/0001-omap3_beagle-uEnv.txt-bootz-n-fixes.patch
> 
> If there is some additional useful information, I would be happy to
> take a look.
> 
> I use the board for testing generic code intended for other OMAP3 systems.

So, here's where things are hard, and well, arg.  I really don't want to
throw out SPL_EXT support from beagleboard as that's one of the generic
distro features which is used by distros.

So here's what I've come up with.  For older (pre gcc-6.x) toolchains,
with the patch that I will do for the next release to allow maximizing
the download space, shuffling some of board/ti/beagle/beagle.c around to
hide some functions (and _strings_ most importantly) that we don't need
in SPL to shove under !CONFIG_SPL_BUILD, disabling falcon mode and SPL
I2C (we initialize but don't appear to use in this case) and dropping
ISO partition support (strings and we don't need in this case), I can
get omap3_beagle back into size constraints with thumb build disabled.
We appear to have all of the required errata enabled but it's also a
known nest of problems to get the right ones on (or disabled) depending
on exact CPU revision.

-- 
Tom
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