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一、 EC200S驱动移植
下载EC200S驱动 打开Linux源码的drivers/usb/serial/option.c文件，找到option_ids数组，在数组中加入如下内容：
{ USB_DEVICE(0x2C7C,0x6002) }
在drivers/usb/serial/option.c文件中找到option_probe函数，在此函数中添加内容：
//Quectel UC20's interface 4 can be used as USB Network device
if(serial->dev->descriptor.idVendor==cpu_to_le16(0x05C6)
&& serial->dev->descriptor.idProduct == cpu_to_le16(0x9003)
&& serial->interface->cur_altsetting->desc.bInterfaceNumber >= 4)
return -ENODEV;
//Quectel EC20(MDM9215)'s interface 4 can be used as USB Network device
if(serial->dev->descriptor.idVendor== cpu_to_le16(0x05C6)
&& serial->dev->descriptor.idProduct == cpu_to_le16(0x9215)
&& serial->interface->cur_altsetting->desc.bInterfaceNumber >= 4)
return -ENODEV;
if (serial->dev->descriptor.idVendor == cpu_to_le16(0x2C7C)) {
__u16 idProduct = le16_to_cpu(serial->dev->descriptor.idProduct);
__u8 bInterfaceNumber = serial->interface->cur_altsetting->desc.bInterfaceNumber;
//Quectel module's some interfaces can be used as USB Network device (ecm, rndis, mbim)
if (serial->interface->cur_altsetting->desc.bInterfaceClass != 0xFF)
return -ENODEV;
if ((idProduct&0xF000) == 0x6000) {
//ASR interface 4 is modem port
}
else if ((idProduct&0xF000) == 0x8000) {
//HISI interface 0 is NCM
if (bInterfaceNumber
if (serial->dev->descriptor.idVendor == cpu_to_le16(0x05C6)
&& serial->dev->descriptor.idProduct == cpu_to_le16(0x9090))
urb->transfer_flags |= URB_ZERO_PACKET;
if (serial->dev->descriptor.idVendor == cpu_to_le16(0x05C6)
&& serial->dev->descriptor.idProduct == cpu_to_le16(0x9003))
urb->transfer_flags |= URB_ZERO_PACKET;
if (serial->dev->descriptor.idVendor == cpu_to_le16(0x05C6)
&& serial->dev->descriptor.idProduct == cpu_to_le16(0x9215))
urb->transfer_flags |= URB_ZERO_PACKET;
if (serial->dev->descriptor.idVendor == cpu_to_le16(0x2C7C))
urb->transfer_flags |= URB_ZERO_PACKET;
}
二、内核配置
-> Device Drivers
-> -*- Network device support
-> USB Network Adapters
-> -*- Multi-purpose USB Networking Framework
-> Device Drivers
-> [*] USB support
-> USB Serial Converter support
-> USB driver for GSM and CDMA modems
-> Device Drivers
-> [*] USB support
-> Support for Host-side USB
-> USB Modem (CDC ACM) support
-> Device Drivers
-> [*] Network device support
-> PPP (point-to-point protocol) support
-> PPP BSD-Compress compression
-> PPP Deflate compression
-> [*] PPP filtering
-> PPP MPPE compression (encryption)
-> [*] PPP multilink support
-> PPP over Ethernet
-> PPP support for async serial ports
-> PPP support for sync tty ports
三、编译内核，EC200S-CN使用USB插入V3S的USB-OTG接口。
内核配置好后，编译内核，V3S用新编译的内核启动，接入EC200S-CN模块后，会生成下面几个驱动，说明EC200S-CN的驱动移植成功。 
四、移植ppp
下载ppp源码在ubunt下交叉编译
cd ppp-2.4.4/
./configure //配置
make CC=arm-linux-gnueabihf-gcc //编译
编译完成后会在当前目录下生成chat/chat、 pppd/pppd、 pppdump/pppdump 和pppstats/pppstats 这四个文件，把这四个文件拷贝到V3S文件系统中的/usr/bin目录下。
在V3S文件系统中创建/etc/gosuncn目录，把下面四个文件拷贝到此目录。
ppp-on.sh
gosuncn_options
gosuncn_ppp_dialer
disconnect.sh
启动脚本拨号
./ppp-on &
出现以下信息说明EC200S-CN拨号成功。 
联网测试 
以上出现的驱动、脚本源码在这里下载。点这里
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