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Ensure the MAC address for all NanoPi R4S boards is assigned unique for each board. FriendlyElec ship two versions of the R4S: The standard as well as the enterprise edition with only the enterprise edition including the EEPROM chip that stores the unique MAC address. In order to assign both board types unique MAC addresses, fall back on the same method used for the NanoPi R2S in case the EEPROM chip is not present by generating the board MAC from the SD card CID. [0] https://wiki.friendlyelec.com/wiki/index.php/NanoPi_R4S#Differences_Between_R4S_Standard_Version_.26_R4S_Enterprise_Version Signed-off-by: David Bauer <mail@david-bauer.net> (cherry picked from commit b5675f500daff3ef3f904e53a5566aa7dc09b786)