On Friday 22 June 2012, Bjorn Helgaas wrote:
> The requirement (if there is one) isn't anything related to PC-ness.
> I just don't understand how things can actually work if two host
> bridges both claim the same bus number. If we do a config read to
> that bus, both bridges should claim it and turn it into config cycles
> on their respective root buses, and we should get two responses. I
> would expect the second response to cause an "unexpected response"
> machine check or similar.
But each PCI domain has its own config space, so if you do a config
read for one bus, it's always relative to the domain.
The part that is specific to PCs is that they don't have PCI domains
normally.
Arnd
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