Author Topic: ..MP-BIOS bug: 8254 timer not connected to IO-APIC  (Read 9468 times)

H_TeXMeX_H

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Upon booting FC5 I get the following message:

..MP-BIOS bug: 8254 timer not connected to IO-APIC

What does this mean ? ... I've googled it, but I still don't know what it means. As far as I know everything works fine on FC5, but this message bothers me ... it wasn't there on FC4.

This is on my notebook
2.8 Ghz Pentium 4
1 GB RAM
GeForce 4 420 Go
SiS chipset

Richard Harris

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Re: ..MP-BIOS bug: 8254 timer not connected to IO-APIC
« Reply #1 on: 19 April 2006, 04:44 »
I just installed FC5 on an AMD 2200 and got the same error. You find out anything yet?

H_TeXMeX_H

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Re: ..MP-BIOS bug: 8254 timer not connected to IO-APIC
« Reply #2 on: 19 April 2006, 05:58 »

H_TeXMeX_H

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Re: ..MP-BIOS bug: 8254 timer not connected to IO-APIC
« Reply #3 on: 15 May 2006, 06:00 »
This bug is definitely caused by the BIOS ... updating it may or may not help depending on what the manufacturers decide to update.

H_TeXMeX_H

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Re: ..MP-BIOS bug: 8254 timer not connected to IO-APIC
« Reply #4 on: 24 July 2006, 03:27 »
I got a question:

Well, I've been looking at the kernel sources recently tring to see what goes wrong. It looks like the error is generated within a function in linux-2.6.1.x/arch/i386/kernel/io_apic.c called check_timer. The error only gets printed if pin1 is anything but -1 and the function timer_irq_works returns zero indicating that the timer IRQs are "defunct". There is a comment about this function (timer_irq_works):

There is a nasty bug in some older SMP boards, their mptable lies
about the timer IRQ. We do the following to work around the situation:

- timer IRQ defaults to IO-APIC IRQ
- if this function detects that timer IRQs are defunct, then we fall
back to ISA timer IRQs

I think this shouldn't happen because I don't have an older SMP board ... any ideas ?


H_TeXMeX_H

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Re: ..MP-BIOS bug: 8254 timer not connected to IO-APIC
« Reply #6 on: 24 July 2006, 06:58 »
Unfortunately, this is a laptop and I have no clue which PCI slots are where.

But as the first article you said states ... I don't really need ioapic or apic cuz it's not smp so I can just use the noapic noioapic boot flags for now.

mass

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Re: ..MP-BIOS bug: 8254 timer not connected to IO-APIC
« Reply #7 on: 31 January 2007, 04:02 »
did you solved the problem now, if you did, how?
i did not completely understand those links at least they did not help much...
what about windows, i can not boot that too, machine restarts itself over and over and everytime it says "Pri Master Hard Disk:S.M.A.R.T. Command Failed"...

Calum

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Re: ..MP-BIOS bug: 8254 timer not connected to IO-APIC
« Reply #8 on: 1 February 2007, 17:49 »
what about windows? try the windowsbbs.com for help using that particular beast.
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