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SubjectRe: IO-APIC + timer doesn't work (was: Linux 2.6.20-rc1)
Tobias Diedrich <> writes:

> Linus Torvalds wrote:
>> Your dmesg is kind of interesting:
>> ..TIMER: trying IO-APIC=0 PIN=0 with 8259 IRQ0 enabled(7)APIC error on CPU0:
> 04(40)
>> .. failed
>> where that APIC error on CPU0 seems to be a "Send accept error" and "Send
>> illegal vector" thing. I think we actually got the interrupt there, but
>> because we had some APIC setup bug, we didn't accept it properly, and it
>> resulted in that "APIC error" thing. Maybe.
> I just tried changing the code so the "8259 IRQ0 enabled" case is
> tested first and with that it boots fine.

Could you try removing the clear_IO_APIC_pin from try_io_apic_pin.

This isn't a complete fix but I believe for your hardware it will
fix the problem and it points at what the real fix is.

Not properly programming the io_apic for the case we want to test.

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