Re: Strange lockup of the timer with 2.4.0-test10 SMP (and older)

From: Benjamin Monate
Date: Tue Nov 21 2000 - 11:27:33 EST

> I guess not -- the timer interrupt and the NMI use different I/O APIC
> inputs. If both are stuck, it's probably 8254 that gets reprogrammed. I
> suppose XFree86 might be at fault -- does it happen with the NMI watchdog
> disabled, either?
Yes. I just enabled the nmi watchdog to try to debug the problem. It did
not change anything.

About the 8254, the kernel log contains :

Nov 20 17:15:15 pc8-118 kernel: MP-BIOS bug: 8254 timer
                                not connected to IO-AP
Nov 20 17:15:15 pc8-118 kernel: ...trying to set up timer (IRQ0)
                                                 through the 8259A ...
Nov 20 17:15:15 pc8-118 kernel: ..... (found pin 0)

But this does not seem to annoy the kernel.

Is there anyway to restore the 8254 to a valid state without rebooting ?

| Benjamin Monate         | |
| LRI - Bât. 490
| Université de Paris-Sud
| F-91405 ORSAY Cedex    

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