enabling IOAPIC on C3 processor?

From: jerome lacoste
Date: Tue Mar 15 2005 - 07:10:18 EST

I have a VIA Epia M10000 board that crashes very badly (and pretty
often, especially when using DMA). I want to fix that.

Serial console + magic SysRQ didn't help so I am going the nmi
watchdog way. But in order to have nmi watchdog I need APIC, right?

The C3 processor seems to support IOAPIC.

- I don't see anything in the BIOS related to APIC.
- grep APIC /lib/modules/`uname -r`/build/.config shows me that all
APIC options are 'y'.
- dmesg | grep APIC tells me "no local APIC present or hardware disabled".
- adding lapic kernel parameter doesn't change that.
- and of course, nmi_watchdog=1 or 2 gives me NMI count 0 in /proc/interrupts.

Did I miss something when it comes to enabling IOAPIC support on C3 processor?

Note: I also see a lot an increasing ERR count in /proc/interrupts,
especially when I put my box in conditions that make it also more
unstable (i.e. sending files on the network while using the PVR-350
using mythtv). Not sure if it is related.


medios@medios:~$ dmesg | grep APIC
No local APIC present or hardware disabled
mapped APIC to ffffd000 (013c1000)

medios@medios:~$ grep APIC /lib/modules/`uname -r`/build/.config

Grub options
kernel /vmlinuz-2.6.11-medios1 root=/dev/hda1 ro
console=ttyS0,57600n8 console=tty0 nmi_watchdog=1 lapic
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