diff --git a/kvmapp/system/init.d/S03usbdev b/kvmapp/system/init.d/S03usbdev
index df5e2486..22876b8d 100755
--- a/kvmapp/system/init.d/S03usbdev
+++ b/kvmapp/system/init.d/S03usbdev
@@ -92,6 +92,10 @@ start_usb_dev(){
         echo 6 > functions/hid.GS2/report_length
         echo -ne \\x05\\x01\\x09\\x02\\xa1\\x01\\x09\\x01\\xa1\\x00\\x05\\x09\\x19\\x01\\x29\\x05\\x15\\x00\\x25\\x01\\x95\\x05\\x75\\x01\\x81\\x02\\x95\\x01\\x75\\x03\\x81\\x01\\x05\\x01\\x09\\x30\\x09\\x31\\x15\\x00\\x26\\xff\\x7f\\x35\\x00\\x46\\xff\\x7f\\x75\\x10\\x95\\x02\\x81\\x02\\x05\\x01\\x09\\x38\\x15\\x81\\x25\\x7f\\x35\\x00\\x45\\x00\\x75\\x08\\x95\\x01\\x81\\x06\\xc0\\xc0 > functions/hid.GS2/report_desc
         ln -s functions/hid.GS2 configs/c.1
+
+        # serial port (ACM)
+        mkdir functions/acm.GS0
+        ln -s functions/acm.GS0 configs/c.1
     fi
 
     if [ -e /boot/usb.disk0 ]