Buss Reset Problem

[CACook at quantum-sci.com]

On Thursday 09 July 2015 15:46:55 Michal Kazior wrote:
> > So that's it for the Doodle Labs ACE-DB-3.  It went back yesterday -- doesn't work with Linux.
> 
> I think someone complained they couldn't get an XB design to work on
> some of their PCI-E hosts (some Atom laptop even refused to POST with
> the card if I recall correctly). Apparently there's an electrical
> quirk - or at least that was to conclusion back then.
> 
> 
> > It's not the buss reset problem as I patched quirks.c.
> 
> I wonder how much related this could be to Data Bus Error ath10k sees
> when doing cold resets sometimes. Maybe it's good to have the quirk
> fixup nonetheless? But I'm no PCI expert so what do I know.

Yes the problem is very early in boot.  In KVM guest almost right after Grub it says that PCIe address does not exist (or is not accessible), and sure enough I check it on the host and it's flipped to "Invalid header".  I have to reboot the _host_ to get the card back then.

The card has good specs but Doodle doesn't care about this problem, and I just don't have time to uselessly fiddle with it.