SMP Linux won't boot with more than 512 of memory

[MrCookie]

I am at work, and we are building a server with the hopes of running 1 gig or ram in it. We have been able to get it to boot in single cpu mode with the 1028mb, but when we try to boot into smp it dies...kernel panic?!?

Motherboard is a Micronics Helios
CPU's are a matched pair of P2-350's
Memory is 4 matched sticks of 256

Had issues with Redhat 7.1 and Slackware 8

Any ideas?

 

[Rendus]

When does it panic? During boot? During init? During load? Heavy load? Disk activity? Only when addressing memory above X? Have you tried 768MB? What's the output when it panics?

 

[MrCookie]

right when it hits init