i've tossed all the previous post since it appears(?) i've discovered the issue, which is explained here: https://www.toradex.com/community/questions/10243/write-issue-with-eeprog-in-eeprom.html if i read that correctly, "eeprog" is not leaving anywhere *near* enough time for a byte write to complete, with a patch suggested here: https://share.toradex.com/s07bedxtxfdc4wj?direct that cranks up the wait period from 10 usec to 5 msec. does this make sense, since that is *exactly* the symptom i'm seeing. thoughts? is no one else seeing this issue? rday -- ======================================================================== Robert P. J. Day Ottawa, Ontario, CANADA http://crashcourse.ca Twitter: http://twitter.com/rpjday LinkedIn: http://ca.linkedin.com/in/rpjday ========================================================================