init-usb-gadget.sh

mkdir /config
mount -t configfs none /config
# Init USB gadget
g=/config/usb_gadget/g1
mkdir $g
echo > $g/UDC
rm -Rf $g/configs
rm -Rf $g/configs
echo 0x18d1 > $g/idVendor
echo 0x4ee0 > $g/idProduct
mkdir -p $g/strings/0x409
echo "rock-pi-s" > $g/strings/0x409/serialnumber
echo rock-pi-s > $g/strings/0x409/manufacturer
echo rock-pi-s > $g/strings/0x409/product

mkdir $g/configs/c.1/
mkdir $g/configs/c.1/strings/0x409
echo 'conf' > $g/configs/c.1/strings/0x409/configuration
echo 0x0409 > $g/bcdDevice

mkdir $g/functions/acm.0
mkdir $g/functions/rndis.rndis
ln -s $g/functions/acm.0 $g/configs/c.1/f1
ln -s $g/functions/rndis.rndis $g/configs/c.1/f2

echo 0x1 > $g/os_desc/b_vendor_code
echo MSFT100 > $g/os_desc/qw_sign
echo 1 > $g/os_desc/use
ln -s $g/configs/c.1 $g/os_desc/c.1
echo 0x3f > $g/configs/c.1/MaxPower

ls /sys/class/udc | head -n 1  | cat > $g/UDC

# Now there is a /dev/ttyGS0, you can launch a getty on it
# Also there is a `usb0` network interface

Cool! It's for armbian?

For anything, it's only using standard Linux kernel api