486/33DLC (Cryix)

This is your problem.

1) Is this a motherboard specifically designed for the Cyrix chip, or
is it a random 386 motherboard with the CPU replaced?

2) Try disabling the cache and see if it helps.

3) In /sys/i386/i386/locore.s, find the `#ifndef CYRIX_CACHE_WORKS',
and rip out the *entire* #ifndef block, both the if and the else sides.
See if that helps (with the cache turned on).