sunxi: orangepi-3: avoid random lan port mac address

target/linux/sunxi/base-files/etc/board.d/02_network

@@ -31,6 +31,13 @@ sunxi_setup_interfaces()
 	esac
 }
 
+orangepi_generate_mac()
+{
+	local sd_hash=$(sha256sum /sys/class/block/mmcblk0/device/cid)
+	local mac_base=$(macaddr_canonicalize "$(echo "${sd_hash}" | dd bs=1 count=12 2>/dev/null)")
+	echo "$(macaddr_unsetbit_mc "$(macaddr_setbit_la "${mac_base}")")"
+}
+
 sunxi_setup_macs()
 {
 	local board="$1"
@@ -42,6 +49,9 @@ sunxi_setup_macs()
 	friendlyarm,nanopi-r1s-h5)
 		lan_mac=$(get_mac_binary "/sys/bus/i2c/devices/0-0051/eeprom" 0xfa)
 		;;
+	xunlong,orangepi-3)
+		lan_mac=$(orangepi_generate_mac)
+		;;
 	esac
 
 	[ -n "$lan_mac" ] && ucidef_set_interface_macaddr "lan" $lan_mac