Re: PCI init issues

Zwane Mwaikambo (
Tue, 4 Mar 2003 17:46:35 -0500 (EST)

On Tue, 4 Mar 2003, Ron Arts wrote:

> > 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.
> >
> > It would be interesting to hear what "Device Manager" (or whatever it is
> > called) unde WinXP claims the interrupts are on this machine... Are they
> > all on irq 48 on XP too? Or has XP gotten magic knowledge somewhere
> > (ACPI?) and they are on different irq's?
> >
> > Linus

How about using 'mptable' (Authored by Pete Zaitcev) to view the
bus,pin and ioapic layout? It showed all the INTA,B,C,D pins on a
troublesome system of mine and helped track down the problem.


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