Messages in this thread | | | Date | Mon, 31 Aug 1998 13:46:15 -0500 (CDT) | From | "Matthew G. Marsh" <> | Subject | Re: APIC IO changes in 2.1.118. |
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On Mon, 31 Aug 1998, Doug Ledford wrote:
[snip]
> Nobody mixed up 2 and 9. It was intentional, but ddoesn't work as planned. > If you leave IRQ 9 enabled, then at least on the Intel DK440LX motherboards > the IO-APIC code is failing to properly set up IRQ 9 and causing system > problems (I've now seen at least three reports of problems with IRQ 9 > disabled). If you leave it disabled, then the DK440LX works like a champ, > but apparently other motherboards break. Time to try and figure out why IRQ > 9 on the DK440LX won't work if it isn't disabled.
Perhaps this snippet from the Intel MB site may help -
IRQ9 cannot be re-assigned
IRQ9 is not available to assign to ISA add-in cards because it is dedicated to the power management function of the PIIX4 controller on the motherboard. This is true for other motherboards which use the 82371AB PIIX4 component.
I ran across this back when the problem first appeared in 2.1.110. It may have bearing on some related DK specific problems (fr'instance I disable the onboard hardware monitor and network desktop management stuff and had many weird lockups go away). I would estatically test any patches that hammered this if it would help. I also considered (have run internally) posting a patch to Config that ifdef's the io_apic.c line above iff you have a DK440LX _and_ run SMP. Maybe if in 2.2 there is an SMP checkbox for config then we could have a DK440LX workaround box.
> Doug Ledford <dledford@dialnet.net> > Opinions expressed are my own, but > they should be everybody's.
Thanks!
-------------------------------------------------- Matthew G. Marsh, President Paktronix Systems, LLC 1506 North 59th Street Omaha NE 68104 Phone: (402) 932-7250 Email: mgm@paktronix.com WWW: http://www.paktronix.com --------------------------------------------------
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