On 01/26/2010 10:16 AM, Linus Torvalds wrote: > > > On Tue, 26 Jan 2010, Bjorn Helgaas wrote: >> >> which IS big enough, and we know the bridge is in fact forwarding the >> [mem 0xd0000000-0xdfffffff 64bit pref] region, because the Radeon works >> when Jeff boots with "pci=use_crs". > > I bet it's a subtractive decode thing. Sure, it could be just another > undocumented range register (does anybody have the datasheet for that > thing?) but Intel tends to often have subtractive decode. > > That system in question has three PCI express root ports, but two of them > have IO and memory disabled according to the lspci info. So maybe it's as > simple as that "I/O Hub PCI Express Root Port 7" just catching anything > that nobody else does, and the single IOH host chip doing the same? > >> I think we should remove intel_bus.c before .33. It's breaking boxes >> and we don't know how to fix it. Even if we do find out how to fix it, >> I think we should move toward using _CRS instead, because that's what >> Windows uses and it's an easy way for the firmware to tell us about >> platform quirks. > > I suspect that for 33 it is indeed best to just revert. But somebody is > bound to have information on how the actual hardware works. Yinghai? I have asked intel if there is any bit that could be enabled the routing. there is no info about for their documentations. Yinghai -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
