[U-Boot] chainloading u-boot on an acer cb5 chromebook (nyan_big)

[Sjoerd Simons]

On Mon, 2016-05-02 at 12:22 -0700, Thomas Hoff wrote:
> Thanks Simon!
> 
> Hey Sjoerd,
> 
> Were you able to chainboot u-boot for your acer cb5?

Yes, that's what the Nyan big in kernelci does constantly :).

The trick is using the description from the mail Simon linked to, but
making sure the offset is aligned. You can do that by tweaking the
description in the FIT image which is put before the u-boot blob
("kernel") to make SYS_TEXT_BASE at a nice offset.

The other bit you need is the patch Tomeu quite send some time ago to
disable EAE (can't remember if that got merged in the end).

There is an older u-boot branch here that should work:
  https://git.collabora.com/cgit/user/tomeu/u-boot.git/log/?h=nyan-big

 
> Cheers,
> 
> Thomas
> 
> On Sun, May 1, 2016 at 11:55 AM, Simon Glass <sjg at chromium.org>
> wrote:
> 
> > 
> > Hi Thomas,
> > 
> > On 28 April 2016 at 13:27, Thomas Hoff <thomashoffltd at gmail.com>
> > wrote:
> > > 
> > > Hello,
> > > 
> > > Could someone help point me in the right direction about
> > > chainloading
> > > u-boot on an acer cb5 chromebook (nyan_big)? I'd like to be able
> > > to do a
> > > nonverified uboot similar to what was done here:
> > > 
> > https://www.chromium.org/chromium-os/firmware-porting-guide/using-n
> > v-u-boot-on-the-samsung-arm-chromebook#TOC-Installing-nv-U-Boot-
> > chained-U-Boot-method-
> > > 
> > > 
> > > I'd really appreciate the help.
> > I've not tried this myself. I have definitely seen talk of it, for
> > example:
> > 
> > https://www.mail-archive.com/u-boot@lists.denx.de/msg167954.html
> > 
> > > 
> > > 
> > > Cheers,
> > > 
> > > Thomas Hoff
> > Regards,
> > Simon
> > 

-- 
Sjoerd Simons
Collabora Ltd.