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Hi Ratz,
> Do _not_ do that! Linux will choose an IRQ for the PCI slot
> and depending on
> whether the board has SCSI or IDE the IRQ wired routing on
> the local APIC is
> different. Forcing an IRQ on a specific PCI slot makes ASUS
> boards with older
> firmware releases go banana when assigning the IRQ routing,
> especially those
> with a onboard SCSI chip. There you have a reversed
> initialisation phase.
Ok.. so IRQ sharing is FIXED in 99% of situations now? I can take 2 quad
cards from different manufacturer's and put them in the same box and they
will work on the same IRQ (from the BIOS perspective)?
>
> Nowadays you can look into the motherboard booklet and see
> the wiring. If you
> intend to put in an additional SCSI card you need to make
> sure that the routing
> is separated. In most 5 to 6 PCI-slot boards, you could for
> example select slot
> 1 and 2 for separation since they are not routed over the
> same chip. It's
> depending on the bridge however.
So SCSI needs to be a seperate IRQ from the rest? Don't share SCSI. What
about Firewire or USB2 or ... ;)
> This all changes if you have a SMP board (how could it be any
> different of
> course :)). There you need to distinguish every single
> motherboard factorisation
> to know how to solve the eventual problem of deplaced IRQ
> sharing. It will very
> much depend on the PCI chipset support in the kernel (in
> Windows world this
> would be the busmaster driver).
It pays to buy good SMP boards. Have you looked at the AMD bus at all?
> I could go on and on and on, ... I spent too many days
> staring at the bus analyzer.
Do the girls know this? I hope they don't get jealous :))
Thanks for your comments
P
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