working alpha version

raspberry-pi/root/scripts/serial-wait.sh

@@ -0,0 +1,18 @@
+#!/bin/bash
+
+SERIAL_PORT="/dev/ttyGS0"
+stty -F "$SERIAL_PORT" raw
+
+while true
+do
+    if read -r line < "$SERIAL_PORT"
+    then
+        # wait for done message
+        if [ "$line" = "DONE" ]
+        then
+            echo "" > /sys/kernel/config/usb_gadget/g1/UDC
+            exit
+        fi
+    fi
+    sleep 0.5
+done