Netgear MA311 with Nforce2 with IO-APIC IRQ problem

[Andrew de Quincey]

Hi, I've been tracking down and patching problems with IRQs and IO-APICs on 
the acpi-devel list. I think I've now sorted these for my motherboard.

I'm having a problem with the above card (Prism 2.5 chipset, real PCI card not 
a PCMCIA bridge).

If I use my PC in XT-style PIC mode, it works.

if I use my PC with the IO-APIC enabled (the card gets IRQ 18 in this case), 
it does not work. No IRQs are ever received from the device, so I get lots of 
timeout errors when the hostap_pci module is inserted.

I think this is not a motherboard problem:

1) A realtek 8139-based ethernet card works fine in the same PCI slot. 
2) The wavelan card works fine in windows XP (and I know APIC is setup the 
same way as it is by my patches).

I'm about to start digging into the Intersil Prism2.5 documentation, but I 
thought I'd check on the list first in case anyone knows what the problem 
might be. 

(I'm using the cvs version of the hostap driver BTW)