I noticed that if I run ultra2 long enought any reboot command
(fastboot, fasthalt, reboot) hangs so machine should be power-cycled.
I don't know how long is 'long enought' because I use machine
in two limits, whether trace+ddb+no-load or normal under load. 

I havn't noticed any harm or system degradation. Is there anything
I can check before issuing reboot. Some directions are needed.

Thanks,
        Andrey