Jay Vassos-Libove wrote:
> This isn't a Linux specific problem, but Linux did help me to pinpoint
> it...
>
> You all may recall a month or so ago I called for help because I seemed to
> have suffered an IRQ line failure on a Pentium 133 system.
>
> In the end, I simply picked a different IRQ and away I went.
>
> I had received one cryptic suggestion from someone in Europe that PCI
> video cards often used IRQ 11 (the IRQ in question in my case), but that
> he didn't know why/how they used it and couldn't explain further.
>
> I just tried to add another PCI card, this time an ethernet card, to the
> system. I got the same symptom: the IRQ of the SCSI board didn't work
> anymore, and the SCSI initialization of the board when Linux booted was
> unable to actually scan the bus.
>
> I took the new PCI ethernet card out and rebooted, and the system worked
> fine again. So, I did "cat /proc/pci" for the first time in my life, and
> lo and behold, the damned PCI video board is using IRQ 11.......
>
> The BIOS in the system is very simple, and has not PCI slot <-> IRQ
> assignment functionality at all. The video card has no jumpers or setup
> program to select its IRQ.
>
> How do I determine what IRQ a PCI card/slot will end up with, and better
> yet, how do I control it? So, how do I get this new PCI ethernet card to
> not conflict with the already used ISA IRQs?
Hi Jay!
I am not sure if my answer is going to help you, but on my motherboards I don't
have IRQs given to
particular card or slot, but rather they are assigned as first declared
available IRQ to first card, second
to second etc., unless, of course they have predeclaired IRQ (like PnP cards).
You can declare 3 IRQs
and they are being used as needed, in order you declared them.
I found that when I tried to installed Ethernet card in my first PCI
motherboard. Somehow it did not work, and while I was rebooting I saw that IRQ
10 that was supposed to be used by my 3com Ethernet card,
was in fact, used by my video card. Editing BIOS and changing IRQ assignment
for PCI (in general, not
for particular slot or card) solved that problem.
Mike
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