openwrt 3g模块上网

硬件环境：

    开发板为RT5053F   

    3G模块为中兴 MC2176 电信版

以下是操作步骤

• 加入VID 、PID

  VID 、 PID 的获取方法是  将设备插入电脑在linux下执行lsusb命令，如图

  watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQvdTAxMTY0MTg4NQ==/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/SouthEast" alt="">

  或者是依照无线模块驱动使用手冊，将产品支持的IDS所有增加option.c文件里

  openwrt-1407在例如以下位置:
  build_dir/target-mipsel_24kec+dsp_uClibc-0.9.33.2/linux-ramips_mt7620n/linux-3.10.49/drivers/usb/serial/option.c
  

• 内核的编译配置

  make kernel_ menuconfig

  USB串口驱动相关的配置项：

  Device Drivers  ---> [*] USB support  --->
  	<*>   Support for Host-side USB
  	[*]     USB announce new devices
  	[*]     Enable USB persist by default
  	<*>     EHCI HCD (USB 2.0) support
  	[*]       Root Hub Transaction Translators
  	[*]       Improved Transaction Translator scheduling
  	<*>     OHCI HCD (USB 1.1) support
  	<*>     USB Modem (CDC ACM) support
  	<*>     USB Printer support
  	<*>     USB Wireless Device Management support
  	<*>   USB Serial Converter support  --->
  		<*>   USB driver for GSM and CDMA modems
  

  PPP拨号的相关配置：

  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
  

  所需软件包：

  ppp
  chat
  comgt
  librt
  libusb-1.0
  usb-modeswith
  zlib
  

  保存 运行make V=99 后将编译好的镜像文件烧写到开发板。然后启动开发板

配置 网络

/etc/config/network
config interface 'ppp0'
        option ifname 'ppp0'
        option service 'evdo'
        option username 'card'
        option password 'card'
        option device '/dev/ttyUSB0'
        option proto '3g'
        option dialnumber '#777'
        option apn 'ctnet'
        option auto 1

重新启动网络

/etc/init.d/netwrok restart

重新启动后 执行ifcong命令，若出现ppp接口表示拨号成功，如图

watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQvdTAxMTY0MTg4NQ==/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/SouthEast" alt="">