Re: ACPI and ISA IRQ 9, Linux 2.4

From: Bill Davidsen (davidsen_at_tmr.com)
Date: 02/23/04

  • Next message: Bill Davidsen: "Re: [PATCH] vm-fix-all_zones_ok (was Re: 2.6.3-mm3)" 
    Date:	Mon, 23 Feb 2004 11:09:20 -0500
To: Krzysztof Halasa <khc@pm.waw.pl>

    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
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  • Next message: Bill Davidsen: "Re: [PATCH] vm-fix-all_zones_ok (was Re: 2.6.3-mm3)"

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