nmi-watchdog not working on S2466

Hi,

does anybody ever got the nmi-watchdog working on a Tyan Tiger MPX S2466? My problems are:
- booting nmi_watchdog=1 results in an error "nmi appears to be stuck"
- booting nmi_watchdog=2 is ok, gives an NMI count in /proc/interrupts but is otherwise non-functional. Doing
iopl(3);while (1) asm("cli");
locks the machine forever (not really: just another watchdog hits after some time)

I used several 2.6.x-kernels - vanilla and -mm - all with the same results. Any ideas? What information is needed to track the problem?

-jo

-rw-r--r--  1 jo users 63 2004-10-27 17:34 /home/jo/.signature