🚀 go-pugleaf

Hi David,

It seems that Linux thinks the SCSI adaptor is on IRQ0.  Maybe it *is*
on IRQ0!

In any case, this seems to be where the problem lies.  The SCSI adaptor
cannot use IRQ0 because the PC's internal timer is hard-wired to IRQ0.

Now, which of the following is true?:

1. Linux thinks it is on IRQ0, but really it isn't.  It is actually on a
sensible IRQ.

2. The SCSI adaptor really has been configured for IRQ0.

3. The PCI bios has assigned IRQ0 to the SCSI.

Find out which of the above is true, then rectify.  I must admit that my
knowledge of PCI (with regard to IRQ assignment) is virtually
non-existent.

To rectify, you must get the SCSI adaptor to use some other IRQ. 
Sensible ones are: 10,11,12,13,14; but, again, it must be an IRQ that is
not is use elsewhere.  You *will* have at least one spare IRQ number you
can choose from.

Check the CMOS settings; i.e those settings which control which IRQ is
mapped to PCI devices.

Does the SCSI adaptor have some sort of interactive configuration
program (which comes up each time you boot)?  The Adaptec 1542, which I
use, has this feature.  At bootup, it says "press Ctrl-A to enter SCSI
setup utility".  If I enter the utility, I can configure which IRQ it
will use.  My card is ISA though, not PCI, and as I said earlier, I'm
not sure about how IRQs are assigned to PCI cards (I strongly suspect by
the PC bios, however).

Possibility number 1, listed above, is extremely unlikely I feel.

Best of luck,
Tom Atkinson