Debugging checkstop on MPC8272 running Linux 2.4

I am getting a checkstop error after my linux device driver runs for
30 to 40 minutes. The board has an MPC8272 processor and I am running
Linux 2.4 on it. How does one debug a checkstop? The board simply
reboots unless I disable the reboot for checkstop, in which case it
hangs. There is no OOPS message.