Re: Interrupt routing with nvidia nforce2

[Andrew Doran <ad%netbsd.org@localhost>]

On Tue, Jun 10, 2008 at 10:23:42PM +0100, Andrew Doran wrote:

> I have a Shuttle SN45 v1 that uses the nforce2 chipset. All of the ACPI
> interrupt routing information for the only PCI slot on the board appears
> correct, and as best I can tell it appears to match the hardware config.
> 
> When using the ioapic, interrupts for the slot never arrive. I suspect that
> some of the interrupt lines may not be physically wired up on the board, but
> hopefully it is a software problem.
> 
> Does anyone else have an nforce2 chipset and do you see similar problems?

Hah, found the problem. Our ACPI/APIC code is throwing away the information
that ACPI provides about whether the interrupt line is active high/active
low, and we always assume active high. Putting in a hack to force the line
to be active low fixes the problem and I can now use the PCI slot. I'll look
for the real issue.

Andrew