rk3399-gru-kevin: issues on bringup

[Marty E. Plummer]

On Mon, Aug 03, 2020 at 08:13:38PM -0600, Simon Glass wrote:
> Hi Marty,
> 
> On Mon, 3 Aug 2020 at 07:49, Simon Glass <sjg at chromium.org> wrote:
> >
> > Hi Marty,
> >
> > On Sun, 2 Aug 2020 at 21:02, Simon Glass <sjg at chromium.org> wrote:
> > >
> > > Hi Marty,
> > >
> > >
> > > 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.
> >
> > Also I pushed the tree with your changes and one of mine here:
> >
> > https://github.com/sjg20/u-boot/tree/kevin
> 
> Well I don't know why the em100 doesn't work, but apparently it never did.
> 
> Anyway the image seems to jump into ATF first, then to U-Boot SPL. So
> perhaps the problem is in ATF. From what I can tell, it prints about
> 10 characters of junk before it starts setting up SDRAM. Perhaps it
> has a clock wrong.
> 
> In any case, it should be possible to jump directly into U-Boot SPL
> and hopefully the debug UART works. Can you try that, perhaps by
> building an image without ATF?
> 
Sure, though I'm not certain how that even works, I don't recall
explicitly setting that up. Just to put goals out there, my plan is
to falcon-mode load a kernel and petitboot for use with 'normal'
distros.
> Regards,
> SImon