On Friday 22 June 2012, Bjorn Helgaas wrote: > > On Fri, Jun 22, 2012 at 10:53 AM, Arnd Bergmann <arnd@xxxxxxxx> wrote: > > 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. > > Oh, I see! I totally missed the fact that each host bridge was in its > own domain. If each has its own domain, then the bus number aperture > can certainly be [bus 00-ff] and there's no problem. Right. On my side, it took me a while to figure out that you can actually have multiple root ports in one domain ;-) Arnd -- To unsubscribe from this list: send the line "unsubscribe linux-tegra" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
