Hi Riley,
On 16 February 2017 at 21:44, Simon Glass sjg@chromium.org wrote:
Hi Riley,
On 15 February 2017 at 17:31, Riley Baird riley@openmailbox.org wrote:
- Do I just have to sign u-boot-dtb.img with vbutil_kernel before
dd-ing it onto a USB, or do I have to do something else to make the right image?
I normally start up U-Boot from scratch, but it sounds like you are chain-loading it.
When chainloading, depthcharge will load and execute u-boot from a fixed address, and U-Boot needs to be told about it.
I chainloaded U-Boot on a nyan chromebook like this:
https://git.collabora.com/cgit/user/tomeu/u-boot.git/commit/?h=nyan-big&...
The important bit is changing u-boot's CONFIG_SYS_TEXT_BASE according to depthcharge's CONFIG_KERNEL_START.
https://chromium.googlesource.com/chromiumos/platform/depthcharge/+/master/b...
You may need to add some padding as shown in the .its file, but I don't remember now why CONFIG_SYS_TEXT_BASE cannot be adjusted instead (almost 2 years have passed already).
I think you can ignore the EAE commit in that branch because that code has been rewritten in u-boot since.
Good luck,
Tomeu