RE: PCI IRQ routing problem in 2.4.0 (updated patch)
Dunlap, Randy (email@example.com)
Wed, 31 Jan 2001 11:11:09 -0800
> From: Martin Diehl [mailto:firstname.lastname@example.org]
> Linus' patch helps you, because it makes us trusting the
> device's config
> space over the routing table. Probably a good idea as long as BIOS'es
> wouldn't start to set wrong values in config space too...
> in fact vanilla 2.4.0 did believe what the bios states,
> namely the broken
> routing table. It didn't believe however what the devices config space
> reports - which turned out to be correct.
The PIRQ (PCI IRQ Routing table) is a Windows 95/98 convention
(requirement). It isn't used by NT or Windows 2000.
IOW, Linux needs to be well-prepared for handling interrupt
routing in the absence of the PIRQ table.
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