On Tue, 15 Mar 2005 13:34:55 +0100, Mikael Pettersson <[EMAIL PROTECTED]> wrote: > jerome lacoste writes: > > 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. > > (http://www.via.com.tw/en/products/processors/c3/specs.jsp) > > > > But: > > - 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? > > Unless you have a pre-release engineering part for a future product, > then your C3 has no local APIC, and hence no I/O APIC functionality. > > I know some C3 specs pages list I/O APIC support, but if you look in > the datasheets for current products you find zero APIC support.
My board is 2 years old (May 2003). I've checked the specs [2] and they say (page 17 out of 83) "APIC will be available in future steppings." Yeah right... Mine is stepping 1 according to /proc/cpuinfo. So if I don't have APIC, that means I cannot use nmi_watchdog to investigate the problem, right? Do I have any alternative to investigate this hang or should I just give up and smash my board? Cheers, Jerome [2] http://www.via.com.tw/en/downloads/datasheets/processors/c3_nehemiah.zip - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
