Critical Interrupt on 405EP

Hello,

I'm running 2.4.20 kernel on a 405EP board and am interested in using
critical interrupt for one of the devices. I've almost got it working,
except that after several minutes (ranging from 10-30) of operation 
kernel crash occurs.

Has anyone got the critical interrupt on 405EP working for 2.4.x
kernels ? I can post details specific to changes I made if someone has
experience regarding this.

Thanks,
Praveen