stereo_m 
Has anybody else experienced that u-boot has lost a mac-adress that has been set with "setenv ethaddr ..."? I really can't understand this but it seems like one of my units has lost its mac address, and it has gone to the default mac which u-boot has before I set the mac address. I think this might have happened during a reset or power failure, but I'm not really sure. Is there anything to do about this or should I just hope it doesn't happen again? I use the mac for identification so I would need it to stay there. How could I write the MAC to some EEPROM from where it could be readable?