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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. Provide a common function to load UIDs from arbitrary OTP registers and generate a serial number string that is saved in the "serial#" env variable. Signed-off-by: Frieder Schrempf <frieder.schrempf@kontron.de>