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The factory provides a CPU UID in the OTPs and the SoM module and the carrier board might provide additional UIDs in the GP registers of the OTPs. Load these values in the following order and create a serial number string: * Board UID (GP2) * SoM UID (GP1) * CPU UID (UNIQUE_ID) The string is stored in the "serial#" env variable and exported to Linux. Further this prints the used UID to the console which looks like this ID: 0042152331 (Board) or: ID: 0030124840 (SoM) or: ID: 4696668CD9516886 (CPU) Signed-off-by: Frieder Schrempf <frieder.schrempf@kontron.de>