case

        case "$board" in
        netgear,wndr3700-v4|\
        netgear,wndr4300|\
        netgear,wndr4300sw|\
        netgear,wndr4300-v2|\
        netgear,wndr4500-v3)
                wan_mac=$(mtd_get_mac_binary caldata 0x6)
                ;;
         asus,rt-ac55u)
                wan_mac=$(mtd_get_mac_binary_ubi "factory" 0x1002)

        esac