[coreboot] [RFH] Native AMD fam10-15 support

[Kyösti Mälkki]

On Fri, Jun 15, 2018 at 2:14 PM, qtux <mail at qtux.eu> wrote:

>
> >> Coreboot did work well, but froze sometimes when booting during the
> >> assigning resources step (more or less exactly after assigning the PCI
> >> 14.3 or PNP 002e.2 device, which happen to be close to each other inside
> >> the devicetree). I had to remove the power cord in order to be able to
> >> boot again (or to get the next random freeze...). Rarely, after such an
> >> recovery, I have got flooded by IOMMU warnings in Linux which would only
> >> disappear after another reboot.
> >
> > Ah, that resume reboot-loop issue. The bit that tells to do S3 resume
> > is a sticky register backed up by Vstb rail. With [2] you should not
> > need to do full power-cycling at least. We should extend this work to
> > other platforms.
> >
>
> I am not sure whether the term resume reboot-loop applies for my issue
> (side note: I used a serial connection to monitor the boot process):
>
> Rebooting (via holding the power button for some seconds) after
> encountering a freeze (aka stopping at the assign resource step)
> resulted into having no output from serial at all. I could repeat this
> with no effect at all, the computer seemed to be dead. Only removing the
> power cord could solve the issue.
>
> This issue could occur when rebooting but even when cold booting.
>

One of these boards had LPC related lockups. I think the solution was to
disable serial console or to set console to low loglevel.



> Answers are inside the text.
> I forgot to mention that I am currently on commit 793ae846e8.
>

Let's take the parent of that, commit 4a027e6e -- the one you refer to only
appears on gerrit review branch.

Kyösti
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