Re: SMP "unexpected IO-APIC"

[<u.milde@gdsys.de>]

Jonathan Claxton wrote:

> > The system is a Asus CUV4X-D motherboard with VIA Apollo Pro 133A
> > chipset. The CPUs are two identical Pentium III Coppermine
> > stepping 06.
> > 
> 
> I also do have the same MB basically, I have the DLS version of this.
> Make sure your bios is up to date and that MPS(?) setting is NOT set
> to 1.4. also try the "noapic" kernel option too. 


Vladimir G. Ivanovic wrote:

>The fix for this is to turn off MPS 1.4 support in your BIOS (i.e.
>downgrade to MPS 1.1). There is no need to set "noapic".


Thanks to both of you.

I missed that BIOS option in the "Boot" section.
Possibly 'operational blindness', OTOH it's not entirely obvious.

Indeed that option was (probably by default?) set to "1.4".
Disabling the option does fix the hangs.

The Redhat 2.4.9-31SMP kernel will still show the warning about the
"unexpected APIC", 2.4.18 won't.

The "noapic" parameter will also avoid the hangs (independent of the
MPS setting), but as pointed out that doesn't seem all that elegant
a solution.

Anyway, my problem is solved. Thanks again for your assistance.

Best regards
 Uwe Milde