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The env variable "SN" is used to store the serial number on DH electronics SoMs. New SoMs will use the variable "dh_som_serial_number". To ensure compatibility, these env variables are synchronized. This is achieved using callback functions. Signed-off-by: Christoph Niedermaier <cniedermaier@dh-electronics.com> Reviewed-by: Marek Vasut <marex@denx.de>