S4882 support

[Eric W. Biederman]

Stefan Reinauer <stepan at suse.de> writes:

> * Eric W. Biederman <ebiederman at lnxi.com> [040324 08:42]:
> > Correct.  The early hypertransport initialization code is not
> > complete in the 4P case.  That incompleteness triggers the later
> > fixups.
>  
> I assume you talk about the setup of the coherent devices.

Yes, I was.  Although it should only be incomplete incoherent 
HT that would cause this.

> > I could not test that case, and there were at least some small
> > difficulties in that it was not obvious how the 4P case should
> > be extended to work properly.
> 
> Can you go a bit into detail, please?

Mostly I could not clearly see which links I needed to call optimize_connection()
on.

> > Why you are getting stuck in amdk8_scan_chains I do not currently
> > understand yet.  I suspect Stefan's suggestion of a delayed reset
> > is the appropriate course to implement.
> 
> Do you have an example situation that would cause the need for a 
> late reset? It would sound clean to only touch this part of the system
> once and at one place. If this is possible, we safe looking at 50% of
> the involved code in case something goes wrong..

2 or more HT I/O chains that are not setup at boot time.

Eric