Posted on November 10, 2015 at 19:11My general preference for such things is to have one firmware, that boots into, or can go into, a configuration mode where calibration or serialization can be done at the last test station. Customers often want a guarantee of sequential serial numbers in multiple pack orders, plus labels, packing lists, etc.
If it is a permanent number consider OTP memory, if that's available in the part, and tracking of the 96-bit ST Unique code in production logs, etc.
