Re: [lkml]Re: interrupt problem with MPS 1.4 / not with MPS 1.1 ?

[Jeff Garzik]

Manfred Spraul wrote:
> 
> >
> > I know that with MPS 1.4, the USB controller finds itself at an
> > unshared interrupt 19. I can't reboot at the moment to check.
> >
> lspci -vxxx -s 00:07.0
> 
> the APIC sits in the southbridge.
> the low 2 bits of offset 0x58 must be set [route USB IRQ to APIC], and
> 
> lspci -vx -s 00:07.2
> 
> offset 0x3C must be set to 3 [19 & 15]
> 
> There was some discussion about the same problem with the sound part of
> the southbridge.

If an IO-APIC is present, 2.4.5 automatically routes all Via IRQs to
external APIC.

See quirk_via_ioapic in drivers/pci/quirks.c.

I have received reports that MPS1.1 works on SMP Via boards, while
MPS1.4 kills it.

-- 
Jeff Garzik      | Disbelief, that's why you fail.
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