The data sheet for the MM912J637 has a section describing the MCU Information Register (IFR). Within this there is an 8-byte entry labelled "Unique Device ID" (see page 395 of the Rev 3.0, 1/2012 data sheet).
However there are no details on this ID elsewhere in the data sheet. Just this one mention in a table.
Is anyone able to give any more info on this 8-byte ID register?
Is it, as it suggests, a globally unique ID? Is it preprogrammed from the Freescale factory?
Bottom line, can I trust it to uniquely identify a particular chip (and hence assembled board)?