Hi Marty, On Tue, 23 Feb 2021 at 16:36, Marty E. Plummer <[email protected]> wrote: > > On Tue, Feb 23, 2021 at 10:10:11AM -0500, Simon Glass wrote: > > Hi Marty, > > > > On Thu, 13 Aug 2020 at 13:35, Alper Nebi Yasak <[email protected]> > > 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 am just replying here as you asked for some details on IRC. What > > details do you need? > > > Well, if its possible to actually do openocd/etc on the AP using a > servo, I'd like to know how. All the documentation I could find is about > using openocd to flash the EC, not debug the AP.
OK...in my case I attached a ARM DSTREAM JTAG unit to the 20-pin connector on the servo 2 board. I was then able to connect and debug U-Boot and linux. This was on a snow (Samsung exynos) so not the same SoC, but it might work. I can't recall the clock speed, but it certainly was slower than 200MHz. This has some info: https://elinux.org/images/7/7f/Manderson5.pdf Here are the instructions I wrote, from the history as they have been removed from the page, being so out of date! https://sites.google.com/a/google.com/chromeos/system/app/pages/admin/compare?wuid=wuid:gx:300e7216a93e8403&rev1=29 > > I was intending to try out a kevin if I have one. I will add that to my > > list. Regards, Simon
