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Date: Thu, 28 Dec 2000 14:22:49 -0500 (EST)
From: <fpieraut@casi.polymtl.ca>
cc: David Huggins-Daines <dhd@eradicator.org>, linux-kernel@vger.kernel.org
Subject: Re: Activating APIC on single processor
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Hi

I have try to activate APIC in my BIOS, but I didn't have this option.
Have you ever try it?

Tanks
Francis Pieraut


Francis Pieraut

On Thu, 28 Dec 2000, John Levon wrote:

> On 28 Dec 2000, David Huggins-Daines wrote:
> 
> > <fpieraut@casi.polymtl.ca> writes:
> > 
> > > I activate APIC interruption with the configuration of linux kernel
> > > 2.4.0test-11. In the linux kernel configuration under processor type and
> > > features I activate "APIC and IO-APIC support on uniprocessor",  and I
> > > desactivate "Symmetric multi-processing support". The only way I found to
> > > check APIC activation is looking into /proc/interrupts, no "IO-APIC" can
> > > be found there. So I read IO-APIC.txt and I suppose there sould be
> > > conflicts with IRQ of my PCI cards. So I remove all my PCI cards and still
> > > have no APIC interrupt. 
> > > Is there another way to check APIC activation? 
> > > Am-I doing to right things to activate IO-APIC?
> > 
> > You might not actually have an IO-APIC or even a local APIC.  This is
> > the case with the Mobile PIII for instance (I puzzled over this myself
> > for a long time).
> > 
> > To find out for sure, run:
> > 
> > grep 'flags.*apic' /proc/cpuinfo
> 
> This isn't for sure. I bet you *do* have a local APIC.
> 
> This flag is missing on a Pentium II here - I think the BIOS disables
> it. However, it can be enabled in the normal way just fine.
> 
> The presence of an IO-APIC is a different matter.
> 
> thanks
> john
> 
> --
> "The majority of the stupid is invincible and guaranteed for all time. The
>  terror of their tyranny, however, is alleviated by their lack of consistency."
> 	- Albert Einstein
> 

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