diff --git a/target/linux/mediatek/base-files/etc/uci-defaults/99_fwenv-store-ethaddr.sh b/target/linux/mediatek/base-files/etc/uci-defaults/99_fwenv-store-ethaddr.sh
new file mode 100644
index 00000000000..b078b8f8ce9
--- /dev/null
+++ b/target/linux/mediatek/base-files/etc/uci-defaults/99_fwenv-store-ethaddr.sh
@@ -0,0 +1,14 @@
+[ ! -e /etc/fw_env.config ] && exit 0
+
+. /lib/functions.sh
+
+case "$(board_name)" in
+bananapi,bpi-r2|\
+bananapi,bpi-r64|\
+unielec,u7623-02)
+	[ -z "$(fw_printenv -n ethaddr 2>/dev/null)" ] &&
+		fw_setenv ethaddr "$(cat /sys/class/net/eth0/address)"
+	;;
+esac
+
+exit 0