On Fri, Dec 3, 2021 at 8:13 PM Simon Glass <s...@chromium.org> wrote: > > Hi Peter, > > On Fri, 3 Dec 2021 at 05:20, Peter Robinson <pbrobin...@gmail.com> wrote: > > > > On Fri, Dec 3, 2021 at 3:32 AM Simon Glass <s...@chromium.org> wrote: > > > > > > Hi Peter, > > > > > > On Wed, 1 Dec 2021 at 07:23, Peter Robinson <pbrobin...@gmail.com> wrote: > > > > > > > > On Thu, Nov 25, 2021 at 5:39 PM Alper Nebi Yasak > > > > <alpernebiya...@gmail.com> wrote: > > > > > > > > > > I have recently started testing booting U-Boot from SPI on my > > > > > gru-kevin > > > > > (as opposed to chainloading it from vendor coreboot + depthcharge) and > > > > > brought it to a better working state based on an initial support patch > > > > > from Marty [1][2] and some follow-up work by Simon [3]. > > > > > > > > > > I tried to keep them as the git author when I took things from their > > > > > work, but squashing other changes into those and rewriting commit > > > > > messages makes things a bit weird in my opinion, especially for > > > > > keeping > > > > > their signoff. Do tell me if there is a better way to that. > > > > > > > > > > As the Kevin and Bob boards are very similar. I assumed the config and > > > > > devicetree changes will be appropriate for Bob as well, and applied > > > > > them > > > > > to it first. I do not have a Bob, so could not test on one myself, but > > > > > Simon did test an earlier version of this and it appears to work [4]. > > > > > > > > > > Other useful things for these boards: > > > > > - Patch to fix a hang when usb controllers exit [5] > > > > > - Series to support HS400ES mode as HS400 training fails [6] > > > > > - Hack to skip eMMC reinitialization so it keeps working [7] > > > > > > > > Is there docs updates to be done in doc/chromium/ for this so people > > > > know how to use it ? > > > > > > This is for bare-metal use though, so it isn't anything to do with > > > Chromium at present. > > > > So are there docs for how do this? I didn't manage to find any, > > although the docs I find can be a little over the place in U-Boot so > > they may be there and I missed them, so either way docs would be fab. > > There are SPI instructions at doc/board/rockchip but they are pretty > 'one way'. So you would need a way to get your old SPI-flash contents > back when it doesn't work, because I don't think these platforms > support SD boot. I use a 'servo' board and a Dediprog em100 SPI > emulator. I know that kevin does not support CCD (Close-Case > Debugging) so you cannot program the SPI flash that way...
I thought there was a different process for the chtomebooks than the usual rockchip route. Do the rockchip chomebooks support writing to a space in SPI and chainloading like some of the other arm chtomebooks did (I think tegra/samsung but my memory fades there)? I think it would be useful to document the rockchip chromebook options somewhere so that people that are interested in using the U-Boot option have some resources, we've had a few queries over the time around that. Peter
