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移远5G模组RG200U-CN，按照FAE给的驱动修改:

drivers\usb\serial\option.c
drivers\usb\serial\usb_wwan.c

PID和VID已添加，编译内核下载后，重启发现系统里只生成了两个ttyUSB节点：

usb 1-1: new high-speed USB device number 2 using ehci-platform
usb 1-1: USB disconnect, device number 2
usb 1-1: new high-speed USB device number 3 using ehci-platform
cdc_ncm 1-1:1.0: MAC-Address: 2e:e2:9f:8a:3a:a6
cdc_ncm 1-1:1.0 usb0: register 'cdc_ncm' at usb-10040000.ehci-1, CDC NCM, 2e:e2:9f:8a:3a:a6
option 1-1:1.2: GSM modem (1-port) converter detected
usb 1-1: GSM modem (1-port) converter now attached to ttyUSB0
option 1-1:1.3: GSM modem (1-port) converter detected
usb 1-1: GSM modem (1-port) converter now attached to ttyUSB1

后来经检查option.c代码发现，是在这个函数中，如下代码导致的：

static int option_probe(struct usb_serial *serial,const struct usb_device_id *id)struct usb_interface_descriptor *iface_desc =&serial->interface->cur_altsetting->desc;struct usb_device_descriptor *dev_desc = &serial->dev->descriptor;#if 1 //Added by Quectel//Quectel UC20's interface 4 can be used as USB Network deviceif (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's interface 4 can be used as USB Network deviceif (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;//Quectel EC25&EC21 's interface 4 can be used as USB Network deviceif (serial->dev->descriptor.idVendor == cpu_to_le16(0x2C7C)&& serial->interface->cur_altsetting->desc.bInterfaceNumber >= 4)return -ENODEV;
#endif			

将这里的
#if 1 改为0，不使用即可，这里判断了接口个数大于4个就会返回失败。

再次编译内核重启，模块识别信息如下：

usb 1-1: new high-speed USB device number 2 using ehci-platform
usb 1-1: USB disconnect, device number 2
usb 1-1: new high-speed USB device number 3 using ehci-platform
cdc_ncm 1-1:1.0: MAC-Address: 36:77:85:76:e5:57
cdc_ncm 1-1:1.0 usb0: register 'cdc_ncm' at usb-10040000.ehci-1, CDC NCM, 36:77:85:76:e5:57
option 1-1:1.2: GSM modem (1-port) converter detected
usb 1-1: GSM modem (1-port) converter now attached to ttyUSB0
option 1-1:1.3: GSM modem (1-port) converter detected
usb 1-1: GSM modem (1-port) converter now attached to ttyUSB1
option 1-1:1.4: GSM modem (1-port) converter detected
usb 1-1: GSM modem (1-port) converter now attached to ttyUSB2
option 1-1:1.5: GSM modem (1-port) converter detected
usb 1-1: GSM modem (1-port) converter now attached to ttyUSB3
option 1-1:1.6: GSM modem (1-port) converter detected
usb 1-1: GSM modem (1-port) converter now attached to ttyUSB4