一.环境
1.开发板的linux kernel:2.6.28.10
2.3G 无线网卡:HUAWEI E303（VendorID:12d1 ProductID:14fe）
二.相关软件：
1.usb-modeswitch-1.1.7.tar :USB设备工作模式转换工具
2.usb-modeswitch-data-20110227.tar :配置usb_modeswitch.conf时使用
3.libusb-1.0.8.tar ：给usb_modeswitch提供一套系统API
4.libusb-compat-0.1.3.tar ：兼容1.0与0.1两个版本
三、相关说明：
1、在libusb-1.0.8和libusb-compat-0.1.3的.configure配置的时候注意参数的设定(指定交叉编译器，指定大小端设置)：
#./configure --build=i686-linux --host=mips-linux-gnu --prefix=/home/wsl/libusb-1.0.8/install "CC=mips-linux-gnu -EL" "LDFLAGS=-EL"
2、修改usb-modeswitch中的Makefile文件时注意（粗体部分请注意修改）：
CC = mips-linux-gnu-gcc
CFLAGS += -Wall -EL
LIBS = -lusb-1.0 -lusb
RM = /bin/rm -f
OBJS = usb_modeswitch.c
PREFIX = $(DESTDIR)/usr
ETCDIR = $(DESTDIR)/etc
UDEVDIR = $(DESTDIR)/lib/udev
SBINDIR = $(PREFIX)/sbin
MANDIR = $(PREFIX)/share/man/man1
LDFLAGS = -L/home/wsl/libusb-1.0.8/install/lib -L/home/wsl/libusb-compat-0.1.3/install/lib-Wl,-R/home/wsl/libusb-1.0.8/install/lib -Wl,-R/home/wsl/libusb-compat-0.1.3/install/lib
INCLUDEDIR1 =-I /home/wsl/libusb-1.0.8/install/include/libusb-1.0
INCLUDEDIR2 =-I /home/wsl/libusb-compat-0.1.3/install/include
LIBDIR1 =-L /home/wsl/libusb-1.0.8/install/lib
LIBDIR2 =-L /home/wsl/libusb-compat-0.1.3/install/lib
.PHONY: clean install uninstall
all: $(PROG)
$(PROG): $(OBJS)
$(CC) $(INCLUDEDIR1) $(INCLUDEDIR2) $(LIBDIR1) $(LIBDIR2)-o $(PROG) $(OBJS) $(CFLAGS) $(LIBS) $(LDFLAGS)
3、编辑usb_modeswitch目录下的usb_modeswitch.conf文件，加入以下内容：
# T-Mobile NL (Huawei E352)
#
# Contributor: Alex Hermann
DefaultVendor= 0x12d1
DefaultProduct=0x14fe
TargetVendor= 0x12d1
TargetProduct= 0x1506
MessageContent="55534243123456780000000000000011062000000100000000000000000000"
MessageEndpoint=0x01
CheckSuccess=5
HuaweiMode=0
4、将上面生成的libusb的动态库和libusb-compat的（lib下的）拷贝到开发板的库目录(/lib)下，将上面生成的usb_modeswitch可执行程序(无文件类型)和usb_modeswitch.conf配置文件下载到开发板某目录（待会执行的时候也是在这个地方执行）下。
5、编译3G模块的驱动option.ko ：配置内核时3G驱动对应的选项Device Drivers--->USB Support---><M>USB Serial Converter support --->[*]USB Generic Serial Driverh和<M>USB driver for GSM and CDMA modems”需编译成模块，才能在后面转换时生成ttyUSB0、ttyUSB1、ttyUSB2。
在内核源码包中找到usb的3G驱动文件 driver//usb/serial/option.c在其中加入3G卡片的HUAWEI_PRODUCT_EC1260 0x1446。然后回到内核顶层目录make modules将usbserial和option编译成模块usbserial.ko和option.ko。将编译生成的usbserial.ko和option.ko下载到开发板中并使用insmod加载。
6、现在就可以使用usb_modeswitch –c ~/usb_modeswitch.conf切换3G卡片的模式了。此时会出现一些信息，你会看到转换成3G模式后的几个串口信息，ttyUSB0, ttyUSB1, ttyUSB2
（打印如下结果，本人也不知道这是成功还是不成功）
# ./usb_modeswitch -W -c usb_modeswitch.conf
Reading config file: usb_modeswitch.conf
* usb_modeswitch: handle USB devices with multiple modes
* Version 1.1.6 (C) Josua Dietze 2010
* Based on libusb0 (0.1.12 and above)
! PLEASE REPORT NEW CONFIGURATIONS !
DefaultVendor= 0x12d1
DefaultProduct= 0x14fe
TargetVendor= 0x12d1
TargetProduct= 0x1506
TargetClass= not set
TargetProductList=""
DetachStorageOnly=0
HuaweiMode=0
SierraMode=0
SonyMode=0
GCTMode=0
KobilMode=0
MessageEndpoint=0x01
MessageContent="55534243123456780000000000000011062000000100000000000000000000"
NeedResponse=0
ResponseEndpoint= not set
Interface=0x00
InquireDevice enabled (default)
Success check enabled, max. wait time 5 seconds
System integration mode disabled
Looking for target devices ...
searching devices, found USB ID 1d6b:0002
searching devices, found USB ID 12d1:14fe
found matching vendor ID
searching devices, found USB ID 1d6b:0002
searching devices, found USB ID 1d6b:0002
searching devices, found USB ID 1d6b:0002
No devices in target mode or class found
Looking for default devices ...
searching devices, found USB ID 1d6b:0002
searching devices, found USB ID 12d1:14fe
found matching vendor ID
found matching product ID
adding device
searching devices, found USB ID 1d6b:0002
searching devices, found USB ID 1d6b:0002
searching devices, found USB ID 1d6b:0002
Found devices in default mode, class or configuration (1)
Accessing device 004 on bus 001 ...
Getting the current device configuration ...
OK, got current device configuration (1)
Using endpoints 0x01 (out) and 0x81 (in)
Using endpoints 0x01 (out) and 0x81 (in)
Inquiring device details; driver will be detached ...
Looking for active driver ...
No driver found. Either detached before or never attached
SCSI inquiry data (for identification)
-------------------------
Vendor String: HUAWEI
Model String: Mass Storage
Revision String: 2.31
-------------------------
USB description data (for identification)
-------------------------
Manufacturer: HUAWEI
Product: HUAWEI Mobile
Serial No.: not provided
-------------------------
Setting up communication with interface 0 ...
usb 1-1: usbfs: process 546 (usb_modeswitch) did not claim interface 0 before use
Using endpoint 0x01 for message sending ...
Trying to send message 1 to endpoint 0x01 ...
OK, message successfully sent
Resetting response endpoint 0x81
Resetting message endpoint 0x01
Device is gone, skipping any further commands
Checking for mode switch (max. 5 times, once per second) ...
Searching for target devices ...
searching devices, found USB ID 1d6b:0002
searching devices, found USB ID 12d1:14fe
found matching vendor ID
searching devices, found USB ID 1d6b:0002
searching devices, found USB ID 1d6b:0002
searching devices, found USB ID 1d6b:0002
Searching for target devices ...
searching devices, found USB ID 1d6b:0002
searching devices, found USB ID 12d1:14fe
found matching vendor ID
searching devices, found USB ID 1d6b:0002
searching devices, found USB ID 1d6b:0002
searching devices, found USB ID 1d6b:0002
Searching for target devices ...
searching devices, found USB ID 1d6b:0002
searching devices, found USB ID 12d1:14fe
found matching vendor ID
searching devices, found USB ID 1d6b:0002
searching devices, found USB ID 1d6b:0002
searching devices, found USB ID 1d6b:0002
Searching for target devices ...
searching devices, found USB ID 1d6b:0002
searching devices, found USB ID 12d1:14fe
found matching vendor ID
searching devices, found USB ID 1d6b:0002
searching devices, found USB ID 1d6b:0002
searching devices, found USB ID 1d6b:0002
Searching for target devices ...
searching devices, found USB ID 1d6b:0002
searching devices, found USB ID 12d1:14fe
found matching vendor ID
searching devices, found USB ID 1d6b:0002
searching devices, found USB ID 1d6b:0002
searching devices, found USB ID 1d6b:0002
No new devices in target mode or class found
Mode switch has failed. Bye.
#
打印如上结果，本人也不知道这是成功还是不成功，但是手头没有可交过费的可上网的3G无线网卡，实验只能到此停止，有待后期条件成熟继续研究。
（未完待续）
参考资料：
嵌入式Linux下3G无线上网卡的驱动_UP-NETARM2410-ChinaUnix博客环境：硬件：合众达DVS365开发板，芯片DaVinci DM365.电信华为EC189的3G无线上网卡。软件：TI定制的嵌入式arm-linux，内核版本2.6.18.简介：由于3G无线上网卡工作模式相同，故其移植也大多雷同，故本次开发同样适用于其他嵌入式开发板，如DM6446，ARM等等。同
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