This guide describes how to enable USB 2.0 / USB 3.0 ncm ethernet gadget on SP7350 platforms.
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Kernel Setup
Enter the kernel configuration by running the following command in the top directory of project.
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Execute the make command to build the Linux image.
ConfigFS (CDC NCM)
Configure the ncm ethernet gadget through configfs saved as a file named setup_ncm.
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#!/bin/sh
USB2_NCM_EN=on
USB3_NCM_EN=on
KERNEL_PATH=/lib/modules/`uname -r`/kernel
GADGET_PATH=$KERNEL_PATH/drivers/usb/gadget
FUNCTION_PATH=$GADGET_PATH/function
COMPOSITE=$GADGET_PATH/libcomposite.ko
U_ETHER=$FUNCTION_PATH/u_ether.ko
U_NCM=$FUNCTION_PATH/usb_f_ncm.ko
insmod $COMPOSITE
insmod $U_ETHER
insmod $U_NCM
# disable debug message
echo 0 > /sys/module/sunplus_udc/parameters/dmsg
mkdir -p /sys/kernel/config
mount -t configfs none /sys/kernel/config
if [ $USB2_NCM_EN = on ]
then
UDC_NAME="f8102800.usb"
DEV_IP=192.168.10.20
# create gadget folder
cd /sys/kernel/config/usb_gadget
mkdir g1
cd g1
echo 64 > bMaxPacketSize0
echo 0x200 > bcdUSB
echo 0x100 > bcdDevice
echo 0x0525 > idVendor
echo 0xa4a1 > idProduct
# composite class
echo 0xEF > bDeviceClass
# subclass
echo 0x04 > bDeviceSubClass
echo 0x01 > bDeviceProtocol
mkdir -p configs/c1.1
mkdir -p configs/c1.1/strings/0x409
echo "ethe" > configs/c1.1/strings/0x409/configuration
mkdir strings/0x409
echo "1234" > strings/0x409/serialnumber
echo "Sunplus" > strings/0x409/manufacturer
echo "SP7350 USB2.0 NCM Ethernet Gadget" > strings/0x409/product
mkdir functions/ncm.usb0
ln -s functions/ncm.usb0 configs/c1.1
# bind UDC
echo $UDC_NAME > UDC
# set ip
ifconfig lo up
ifconfig usb0 ${DEV_IP} netmask 255.255.255.0 up
fi
if [ $USB3_NCM_EN = on ]
then
UDC_NAME="f80a1000.dwc3"
DEV_IP=192.168.20.20
# create gadget folder
cd /sys/kernel/config/usb_gadget
if [ $USB2_NCM_EN = on ]
then
mkdir g2
cd g2
else
mkdir g1
cd g1
fi
echo 64 > bMaxPacketSize0
echo 0x300 > bcdUSB
echo 0x100 > bcdDevice
echo 0x0525 > idVendor
echo 0xa4a1 > idProduct
# composite class
echo 0xEF > bDeviceClass
# subclass
echo 0x04 > bDeviceSubClass
echo 0x01 > bDeviceProtocol
mkdir -p configs/c1.1
mkdir -p configs/c1.1/strings/0x409
echo "ethe" > configs/c1.1/strings/0x409/configuration
mkdir strings/0x409
echo "5678" > strings/0x409/serialnumber
echo "Sunplus" > strings/0x409/manufacturer
echo "SP7350 USB3.0 NCM Ethernet Gadget" > strings/0x409/product
mkdir functions/ncm.usb0
ln -s functions/ncm.usb0 configs/c1.1
# bind UDC
echo $UDC_NAME > UDC
# set ip
if [ $USB2_NCM_EN = on ]
then
ifconfig usb1 ${DEV_IP} netmask 255.255.255.0 up
else
ifconfig lo up
ifconfig usb0 ${DEV_IP} netmask 255.255.255.0 up
fi
fi |
Implementation
After updating the image to the SP7350 platform and booting the system, use sh setup_ncm command to configure USB 2.0 and USB 3.0 as ncm ethernet gadgets and connect them to the windows PC through USB cables. “SP7350 USB2.0 NCM Ethernet Gadget“ and “SP7350 USB3.0 NCM Ethernet Gadget“ will show up in “Other devices” of Device Manager.
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