I have an industrial PC with a split backplane. One side has 5 PCI slots, the
other has 4. Our dual Pentium 500 SBC cards block slots 1 through 3. I found if
I put a VMIC reflective memory card in slot 4 it gets an IRQ of 17. If I put it
in slot 5 it gets IRQ 16. The Adaptec SCSI is on the SBC and it also gets IRQ
16. I don't want shared interrupts because I may always have the memory
interrupts enabled. If I boot uniprocessor the memory card is at IRQ 9. 

How does Linux assign IRQs?

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