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@chromium.org wrote:

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Hi Thomas,

On 28 April 2016 at 13:27, Thomas Hoff thomashoffltd@gmail.com wrote:

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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-

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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

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Cheers,

Thomas Hoff

Regards, Simon