Most PCI bus machines only have 4 interrupts available to PCI cards A,B,C and D.
The bios will map these as old ISA bus IRQ's 3-11 as needed, IRQ's 0,1,2,12-15
are not usually mapped to PCI expansion card slots. The first thing you should
try
is to just change which slot you have the card in. If your not using a bus mouse
(ps2 mouse port) try disabling it, which will free up IRQ 12 which usually also
results
in the PCI bus slots being assigned new IRQ's.
Ken Teh wrote:
> I have a RTLinux x86 box with a PCI device that shares the IRQ with the
> network card. Originally, I had the device in another PC (with the same
> network card, but different motherboard), and had done my RTL development
> there. Everything worked. Now with the new motherboard, nothing runs
> because of the shared IRQ.
>
> My understanding of IRQs is sketchy, but it is my understanding that the
> motherboard BIOS is supposed to resolve IRQ numbers between the various PCI
> devices. Do I have a faulty motherboard?
>
> Thanks, Ken
>
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