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

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

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