Re: ACPI and ISA IRQ 9, Linux 2.4

[Bill Davidsen <davidsen@tmr.com>]

Krzysztof Halasa wrote:
> Hi,
> 
> I think this is a known problem, but I don't know how to fix it:
> 
> I have a dual Pentium-2 machine (non-SCSI Asus P2B-D), latest BIOS with
> ACPI etc. It has an ISA card (serial port) using IRQ 9 (I can't change
> the IRQ). It works fine without ACPI, Linux 2.4 lists IRQ 9 as
> APIC edge-triggered.
> 
> With acpi=force (due to BIOS date) IRQ 9 is used by ACPI. /proc/interrupts
> lists it as APIC level-triggered, and the ISA card no longer generates
> interrupts.
> 
> IRQ 9 is set to "ISA" in BIOS setup. acpi_irq_isa=9 doesn't help.
> 
> Is is possible to fix it? Or is it just impossible to use ISA IRQ 9
> with ACPI?
> 
> More details available on request, of course.

I have a similar problem, and my aha1520 can't be moved off irq9 without 
cutting traces on the system board. How bad is it without ACPI at all? I 
tried that for a while, and several other things didn't work, and it 
looks as if the aha1520 driver won't share irq anyway, and something 
else (I forget) wants that irq as well.

I boot into 2.4 to do backups, fortunately the only thing on the SCSI.


-- 
bill davidsen <davidsen@tmr.com>
   CTO TMR Associates, Inc
   Doing interesting things with small computers since 1979