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SubjectRe: Fixes for nforce2 hard lockup, apic, io-apic, udma133 covered
On Wed, 10 Dec 2003, Ross Dickson wrote:

> Relevant dmesg output from Albatron KM18G Pro ( this is different MOBO (same type) but
> this time has a barton core 2500 XP cpu).
> enabled ExtINT on CPU#0
> ESR value before enabling vector: 00000000
> ESR value after enabling vector: 00000000
> init IO_APIC IRQs
> IO-APIC (apicid-pin) 2-0, 2-16, 2-17, 2-18, 2-19, 2-20, 2-21, 2-22, 2-23 not connected.
> ..TIMER: vector=0x31 pin1=2 pin2=-1
> ..MP-BIOS bug: 8254 timer not connected to IO-APIC pin2
> ..TIMER: Is timer irq0 connected to IOAPIC Pin0? ...
> IOAPIC[0]: Set PCI routing entry (2-0 -> 0x31 -> IRQ 0 Mode:0 Active:0)
> ..TIMER check 8259 ints disabled, imr1:ff, imr2:ff
> ..TIMER: works OK on apic pin0 irq0
> Using local APIC timer interrupts.
> calibrating APIC timer ...
> ..... CPU clock speed is 1829.0708 MHz.
> ..... host bus clock speed is 332.0674 MHz.
> cpu: 0, clocks: 332674, slice: 166337
> CPU0<T0:332672,T1:166320,D:15,S:166337,C:332674>

Hmm, while this is different from what is documented in the MP Spec, it
looks like the 8254 IRQ is connected to INTIN0 indeed. We can handle such
a setup if the BIOS reports routing correctly. Since you invoke
io_apic_set_pci_routing() I assume you use ACPI for IRQ routing
information. Can you please rebuild the kernel with APIC_DEBUG set to 1
in include/asm-i386/apic.h and send me the bootstrap log? Can you please
send me the output of a tool called `mptable' as well, so that I can
compare the results?


+ Maciej W. Rozycki, Technical University of Gdansk, Poland +
+ e-mail:, PGP key available +
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