Re: AC'97 (VT82C686A) & IRQ reassignment (I/O APIC)

From: Jeff Garzik (
Date: Mon Apr 30 2001 - 11:38:36 EST

"Richard B. Johnson" wrote:
> Observe that the PCI DWORD (long) register at DWORD offset 15 consists
> of 4 byte-wide registers (from the PCI specification), Max_lat, Min_Gnt,
> Interrupt pin, and interrupt line. Nothing has to fit into 4 bits, you
> have 8 bits. I haven't looked at the Linux code, but if it provides only 4
> bits for the IRQ, it's broken.

Non-IO-APIC Via audio hardware only decodes the lower 4 bits of the IRQ.

Jeff Garzik      | Game called on account of naked chick
Building 1024    |
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