rk3399-gru-kevin: issues on bringup

[Simon Glass]

Hi Marty,

On Fri, 31 Jul 2020 at 12:30, Simon Glass <sjg at chromium.org> wrote:
>
> Hi Marty,
>
> On Fri, 31 Jul 2020 at 05:19, Marty E. Plummer <hanetzer at startmail.com> wrote:
> >
> > On Tue, Jul 28, 2020 at 12:58:30PM -0600, Simon Glass wrote:
> > > Hi Marty,
> > >
> > > On Tue, 21 Jul 2020 at 21:07, Marty E. Plummer <hanetzer at startmail.com> wrote:
> > > >
> > > > On Tue, Jul 21, 2020 at 10:21:52AM -0600, Simon Glass wrote:
> > > > > Hi Marty,
> > > > >
> > > > > Did you check spl_boot_device()?
> > > > >
> > > > After sending the initial email I noticed your binman work, which does
> > > > some of the stuff I think I need. My current setup is as follows:
> > > >
> > > >
> > > > > Also take a look at the CONFIG_TARGET stuff in the code as it might
> > > > > speciy BOB but not KEVIN.
> > > > Yeah. I worked that in.
> > > >
> > > > Currently, a rom which is built with these changes (assuming u-boot.rom
> > > > is what I want for SPI booting; strange its only 4mb, aren't these
> > > > devices 8mb flash?) I get no output at all over the servo, aside from
> > > > the EC.
> > >
> > > I think it is only 4MB.
> > >
> > Nah, kevin is deffo 8mb flash chip. Otherwise I wouldn't have been able
> > to shove a 7.xmb kernel+initramfs into a coreboot image and flash it.
>
> Well that's odd. Maybe Kevin got a larger device than gru?
>
> >
> > I have to pad the u-boot.rom with dd to flash it.
> > > I am not sure that I have a kevin. Did you try using the debug UART?
> > >
> > Yeah, assuming you mean `dut-control cpu_uart_pty` with a servo hooked
> > up, and using `socat READLINE /dev/pts/something`. I get no output, but
> > the same chromiumos chroot with vanilla coreboot+depthcharge and
> > hardware config does do output as expected.
> >
> > Perhaps I'm missing something simple.
>
> Probably, it often is. But what?!
>
> I actually just found some old Chromebooks I didn't know i had, so I
> have a Kevin. If you push your tree somewhere I might be able to take
> a look this weekend.

I dug this out but I cannot get it to boot with the em100 emulator.
I'll see if I can figure that out at some point. Sometimes I get
serial garbage as well.

It is surprising that the flash is 8MB when Gru is 4MB. Must have run
out of room.

Regards,
Simon