# allow root login from gadget serial port
grep ttyGS0 /etc/securetty || echo -e "# usb gadget serial\n/dev/ttyGS0\n" >> /etc/securetty
# allow root login from gadget serial port
grep ttyGS0 /etc/securetty || echo -e "# usb gadget serial\n/dev/ttyGS0\n" >> /etc/securetty