[U-Boot] [PATCH v9 2/2] Odroid-XU3: Add documentation for Odroid-XU3

[Lukasz Majewski <l.majewski@majess.pl>]

Hi Sjoerd,

> On Fri, 2014-11-28 at 13:45 +0900, Hyungwon Hwang wrote:
> > On Thu, 27 Nov 2014 15:33:05 +0100
> > Sjoerd Simons <sjoerd.simons@collabora.co.uk> wrote:
> 
> > > signed_bl1_position=1
> > > bl2_position=31
> > > uboot_position=63
> > > tzsw_position=719
> > > env_position=1231
> > > 
> > > for the various locations.. Which also explains the limit 335872
> > > bytes in your initial mail.. Awkward one though. Wonder if that's
> > > an SoC issue or something hardkernel could fix by having a
> > > different bl1/bl2?
> > > 
> > 
> > (719 - 63) * 512 = 335876 bytes. The limitation is needed not to
> > overwrite tzsw.
> > 
> > Are you saying that the limitation can be removed? Yes, with
> > different bl1/bl2. But I do not think that another bl1/bl2 will be
> > released to relieve the limitation.
> 
> It was a something i was wondering. After send this e-mail i had a
> chat with Mauro Ribeiro on #linux-exynos. He indicate that the BL2
> determines the u-boot load location and that it's an u-boot SPL build
> from their u-boot branch. Also he indicated that he would be happy to
> sign a modified SPL build which e.g. loads u-boot from behind the
> TZSW.
> 
> You can find the IRC log here:
> http://irclog.whitequark.org/linux-exynos/2014-11-27
> 
> I have yet to take him up on that offer though, but it sounds like a
> good way forward. The current layout really isn't practical.
> 

It indeed isn't very practical, but this is what you received from
HardKernel when you buy XU3 board.

Of course you can grab their sources, modify the layout, prepare
u-boot's SPL and send it to them to be signed.
However, it is not the way the "normal" user do things.

He or she would like to replace standard (and outdated) HardKernel
u-boot on their SD card and go forward with booting kernel.

For now we _must_ focus on supporting XU3 with default BL1/BL2 and hence
we are obliged to have u-boot size smaller than 328 KiB.

It is challenging but for sure doable.

Best regards,
Lukasz Majewski
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