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Need help with lockups on tyan s2460 motherboard in SMP mode

I have googled a lot on this issue, but if there is somewhere else I can
look, please tell me.

I have a dual AMD 1600+ (MP processors) system with tyan s2460
motherboard that freezes with no error messages in syslog.  I have read
(among a lot of other things):

and what I have done so far is:

replaced power supply with Enermax 550
BIOS upgrade to 1.05
kernels used are 2.4.18 from debian, 2.4.20 and 2.4.21-pre6 
compiled in acpi (acpi-200303028-2.4.21-pre6)
compiled out acpi
compiled with and without Athlon support
Currently using 2.4.21-pre6 for i386

booted with combinations of the following:

tried the following bios settings in various combinations:
MultiProcessor specification 1.1 and 1.4
Use PCI Interrupt Entries in MP as yes and no
enabled/disabled acpi
enabled/disabled power management

The only way I have found to reliably crash the system is to compile two
kernels simultaneously while in smp mode.  If I boot with 'nosmp' the
system seems ok (still running and compiling after 9 hours).

Because the system runs ok with one processor, it leads me to think it
may be kernel code, and not heat or memory related.  Though I guess it
could be the motherboard still.  Is this a correct assessment?  I'd be
happy to send any additional information.

Any and all suggestions are welcome.


Jamie Strandboge

Email:        jstrand1@rochester.rr.com
GPG/PGP ID:   26384A3A
Fingerprint:  D9FF DF4A 2D46 A353 A289  E8F5 AA75 DCBE 2638 4A3A

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