OpenWrt – Rev 1

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#!/bin/sh

. /lib/functions.sh

preinit_set_mac_address() {
        case $(board_name) in
        asus,map-ac2200)
                base_mac=$(mtd_get_mac_binary_ubi Factory 4102)
                ip link set dev eth0 address $(macaddr_add "$base_mac" +1)
                ip link set dev eth1 address $(macaddr_add "$base_mac" +3)
                ;;
        meraki,mr33)
                mac_lan=$(get_mac_binary "/sys/bus/i2c/devices/0-0050/eeprom" 102)
                [ -n "$mac_lan" ] && ip link set dev eth0 address "$mac_lan"
                ;;
        zyxel,nbg6617)
                base_mac=$(cat /sys/class/net/eth0/address)
                ip link set dev eth0 address $(macaddr_add "$base_mac" +2)
                ip link set dev eth1 address $(macaddr_add "$base_mac" +3)
        esac
}

boot_hook_add preinit_main preinit_set_mac_address