Messages in this thread | | | Date | Wed, 5 Mar 2003 01:46:56 +0300 | From | Ivan Kokshaysky <> | Subject | Re: PCI init issues |
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On Tue, Mar 04, 2003 at 10:54:21AM -0800, Linus Torvalds wrote: > Well, I'd say it looks like the MP table _claims_ that only pin0 is > connected. Remember: the claim was that this machine worked on WinXP.
It seems that "IRQ redirection table" is gathered directly from IO_APIC hardware (I may be wrong though), and it conforms to other data...
> So there are at least two potential reasons for that: > > - The MP table is simply wrong, and WinXP gets the routing information > from somewhere else (ie most likely ACPI) > > - The MP table is right, and only pin0 is connected, and WinXP only uses > pin0 (ie it puts the card in some state where all irqs are shared > across all of the four tulip chips). > > Maybe somebody can come up with other schenarios.
- XP is able to reprogramm the IO_APIC so that all four pins are routed properly.
Sounds a bit heretical, I know. :-)
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