spurious 8259A interrupt : IRQ7 + motherboard

Sequeira, Tony Tony.Sequeira at Edexcel.org.uk
Fri Jan 17 03:19:59 PST 2003


> -----Original Message-----
> From: Matthew Burgess [mailto:ca9mbu at eos.sunderland.ac.uk]
> Sent: 17 January 2003 10:59 am
> To: lfs-support at linuxfromscratch.org
> Subject: Re: spurious 8259A interrupt : IRQ7 + motherboard
> 
> 
> "Ian Molton" <spyro at f2s.com> wrote in message
> news:20030117084045.2867b491.spyro at f2s.com...
> > On Fri, 17 Jan 2003 02:48:37 +0000 (UTC)
> > jrh29 at po.cwru.edu (Justin Hibbits) wrote:
> >
> > > > I think thats what the 'spurious' is supposed to mean, dude ;-)
> > > >
> > >
> > > I know that.  But the kernel should silently ignore 
> interrupts from an
> > > uninitialized device, and if it doesn't, they should fix it.
> >
> > Im no expert on the X86, but isnt IRQ 7 a multiplexed IRQ?
> >
> > If so, its not possible to mask it whilst one device is unmasked.
> >
> > >  btw, it
> > > may depend on the kernel too.  I use 2.4.18, and it works like a
> > > charm, no noise whatsoever.  Hell, it may just be I'm 
> lucky at this.
> >
> > probably :)
> 
> Ian, your knowledge of this sounds far beyond mine, but I 
> seem to remember
> having this problem a while back with my Athlon XP rig.  I 
> did a search on
> google and was lead to believe it was the inclusion of one of 
> the "APIC"
> options in the kernel config that caused this particular 
> message to fire off
> (try "Local APIC support" or similar).  Disabling support for 
> this had no
> ill effects, and removed the message once and for all.
> 
> Regards,
> 
> Matt.

That is odd.  My old 486 without APIC support of any
kind in the kernel comes up with this.  Only at system boot
time and only when scanning the IDE drives and always on
drive 3.  Kernel 2.4.18.  The thing is I had a disk failure
on that very drive only days after I upgraded and this
message appeared, but this may be coincidental, as the machine
and drives are very old.  Another drive, and total rebuild
of the system still shows the same symptoms.


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