rk3399-gru-kevin: issues on bringup

[Simon Glass]

Hi,

On Thu, 13 Aug 2020 at 13:35, Alper Nebi Yasak <alpernebiyasak at gmail.com> wrote:
>
> Hi Simon, Marty,
>
> I'm interested in getting U-Boot to work with Kevin as well, but don't
> have a Servo (or the willingness to open up the case yet), so I've been
> trying to boot from depthcharge as in README.chromium-chainload.
>
> I don't have a way to see serial output and I see no other signs of
> life. Can you give me a tested configuration that immediately powers-off
> or reboots a Kevin so I can confirm what I'm doing works on the
> chainloading side? I mean I can boot Linux, but trying the same with
> U-Boot just gives me a blank screen even after accounting for a lot of
> things.
>
> Meanwhile, I've wrote some code to automate making depthcharge partition
> images, and to enable the display on Kevin (and perhaps Bob). Since I
> don't know if chainloading works, I don't know if these are broken or
> not either. I'm unsure about sending untested patches to the list, so I
> put them up here if you want to take a look (and maybe test/fix them?):
>
> https://github.com/alpernebbi/u-boot/tree/rk3399-gru-kevin/wip
>
> They're not really things that'd make a non-booting Kevin boot, though.
> I hope at least some of it can be useful in some way.

I have the em100 working and have got to the same point as you, Marty.

em100 -s -c gd25lq64 -d /tmp/b/chromebook_kevin/u-boot.rom -r

So I suppose that means that SDRAM is running and we just need a SPI
driver? I will see if I can figure out what is missing...

Update...it seems to just be missing the ID. I pushed a new patch to:

https://github.com/sjg20/u-boot/tree/kevin

Now I see:

Channel 0: LPDDR3, 933MHz
BW=32 Col=10 Bk=8 CS0 Row=15 CS1 Row=15 CS=2 Die BW=16 Size=2048MB
Channel 1: LPDDR3, 933MHz
BW=32 Col=10 Bk=8 CS0 Row=15 CS1 Row=15 CS=2 Die BW=16 Size=2048MB
256B stride

U-Boot SPL 2020.10-rc1-00111-gc31b9b4a3f1-dirty (Mar 10 2021 - 21:48:26 -0700)
Trying to boot from SPI


U-Boot 2020.10-rc1-00111-gc31b9b4a3f1-dirty (Mar 10 2021 - 21:48:26 -0700)

Model: Google Kevin
DRAM:  3.9 GiB
Cannot find regulator pwm init_voltage
MMC:   mmc at fe320000: 1, sdhci at fe330000: 0
Loading Environment from MMC... *** Warning - bad CRC, using default environment

Got rc -1, expected 100
Failed to probe keyboard 'keyboard-controller'
In:    serial at ff1a0000
Out:   serial at ff1a0000
Err:   serial at ff1a0000
Model: Google Kevin
Net:   No ethernet found.
Hit any key to stop autoboot:  0
=>

No display and various errors on the way up, but at least it boots to a prompt.

Regards,
Simon