Hi,
On Thu, 13 Aug 2020 at 13:35, Alper Nebi Yasak alpernebiyasak@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@fe320000: 1, sdhci@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@ff1a0000 Out: serial@ff1a0000 Err: serial@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