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rootfs_overlay/etc/boardid.config

# boardid.config
# Read the serial number from the U-boot environment block. The variable
# "nerves_serial_number" is the desired variable to use. "serial_number" is
# checked as a backup.
-b uboot_env -u nerves_serial_number
-b uboot_env -u serial_number
# Use the serial number programmed into the EEPROM. All official
# Beagleboard.org hardware supports this.
-b bbb -n 4
# Use the MAC address of the first Ethernet port. This is useful for
# custom boards that don't include the EEPROM or leave it unprogrammed.
-b macaddr -n 4