AM3352通过串口连接中兴ME3630的4G设备，未能生成/dev/ttyusb设备节点

    内核修改如下：    

    1.menuconfig

1. 1Device Drivers --->
          USB support --->
               USB Serial Converter support --->
                        USB Generic Serial Driver
                        USB driver for GSM and CDMA modems
1.2 Device Drivers --->
           Network device support --->
                PPP (point-to-point protocol) support
                PPP multilink support
                PPP filtering
                PPP support for async serial ports
                PPP support for sync tty ports
1.3 Device Drivers --->
           Network device support --->
                USB Network Adapters --->
                     Multi-purpose USB Networking Framework

2.4G设备添加

\drivers\usb\serial\option.c

static struct usb_device_id option_ids[] =

{
         { USB_DEVICE(0x19d2, 0x0117 },

{ USB_DEVICE(0x19d2, 0x0199) },
{ USB_DEVICE(0x19d2, 0x1476) }

添加单板类型匹配

printk("idVendor=%x, idProduct=%x, bInterfaceNumber =%d\r\n", 

serial->dev->descriptor.idVendor,
serial->dev->descriptor.idProduct,
serial->interface->cur_altsetting->desc. bInterfaceNumber);

if (serial->dev->descriptor.idVendor == 0x19d2 &&
serial->dev->descriptor.idProduct == 0x1476 &&
serial->interface->cur_altsetting->desc. bInterfaceNumber == 3)
return -ENODEV;
if (serial->dev->descriptor.idVendor == 0x19d2 &&
serial->dev->descriptor.idProduct == 0x1476 &&
serial->interface->cur_altsetting->desc. bInterfaceNumber == 4)
return -ENODEV;
if (serial->dev->descriptor.idVendor == 0x19d2 &&
serial->dev->descriptor.idProduct == 0x1509 &&
serial->interface->cur_altsetting->desc. bInterfaceNumber == 4)
return -ENODEV;
if (serial->dev->descriptor.idVendor == 0x19d2 &&
serial->dev->descriptor.idProduct == 0x1509 &&
serial->interface->cur_altsetting->desc. bInterfaceNumber == 5)
return -ENODEV;