| Re: [proaudio] strange irq things |
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- To: proaudio@xxxxxxxxxxxxxxxxxxx
- Subject: Re: [proaudio] strange irq things
- From: "Mark Knecht" <markknecht@xxxxxxxxx>
- Date: Tue, 9 Jan 2007 04:48:59 -0800
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Keep in mind that on most machines IRQ's are *not* freely assignable
entities. Most machines restrict the PCI IRQ's to a certain group and
then share them with other hardware on the motherboard on a slot by
slot basis. This is hard wired in the PC board traces on the
motherboard. If the MB designer hooks the hard drive IRQ (say IRQ 14)
to PCI slot 2 then there is nothing you can do to change the fact that
they are shared.
Many MB's tie the AGP IRQ to the PCI slot 1 IRQ since they are right
next to each other.
The most you can do in this case is change the IRQ #. In the case
above, if you changed the AGP VGA IRQ to 12, PCI slot #1 would also
become IRQ 12 since they are tied together using a motherboard trace.
Hope this helps clarify a bit,
Mark
On 1/9/07, kRAkEn/gORe <kunitoki@xxxxxxxxx> wrote:
thanx Dominique, i will try disabling acpi and see if that works.
for pci card swapping, the problem is that i have no cards at all
in my PCI slot (that is only one on my microatx!) apart from the
echo3g pci card...
regards,
lucio
On 1/9/07, Dominique Michel <dominique.michel@xxxxxxxxxxxx> wrote:
>
> You must try to move some cards from slot to slot. Be aware at some PCI
slots
> can have shared IRQ with other PCI slots and/or with other hardware on the
> motherboard. The documentation for you motherboard will show you that.
>
> In order to get the same IRQ as in the doc, you can try to boot with an
acpi=off
> boot parameter (a laptop will not work with this).
>
> Best,
> Dominique
>
>