华为3G网卡E1750在omap3530上移植(一)
一、环境
1、 开发板内核：linux-2.6.28-omap
2、 3G卡片：华为E1750
二、相关工具
1 usb-modeswitch-1.0.2.tar.bz2
usb_modeswitch这个工具来进行3G模式转换
2 libusb-0.1.12.tar.gz
libusb提供给usb_modeswitch一套系统API
三、交叉编译
1．交叉编译libusb
解压并进入libusb-0.1.12目录，建立子目录install用于存放最后生存的库文件与头文件。
[[email protected]]# mkdir install
配置并生成Makefile文件
[[email protected]]# ./configure --build=i686-linux --host=arm-none-linux-gnueabi --prefix=/home/libusb-0.1.12/install
[[email protected]]# make
[[email protected]]# make install
（我的交叉编译器是arm-none-linux-gnueabi，你的可能是arm-linux）
2. 交叉编译usb_modeswitch
（1）修改Makefile文件
CC = arm-none-linux-gnueabi
（2）将libusb里的库头文件拷到交叉编译器的include和lib目录下
（3）make
（4）修改usb_modeswitch-1.0.2目录下的usb_modeswitch.conf文件
# Huawei E1750
DefaultVendor= 0x12d1
DefaultProduct= 0x1446
TargetVendor= 0x12d1
TargetProduct= 0x1001
# only for reference and 0.x versions
MessageEndpoint=0x01
MessageContent="55534243123456780000000000000011060000000000000000000000000000"
HuaweiMode=0
3. 将上面生成的libusb动态库拷贝到文件系统的库目录下，将上面生成的usb_modeswitch可执行程序和usb_modeswitch.setup拷贝到文件系统/usr/sbin和/etc目录下。
四、交叉编译3G卡片驱动
在2.6.28内核源码中驱动/driver/usb/serial/ option.c中加入3G卡片的ID信息：
#define HUAWEI_PRODUCT_E1750 0x1446
Make menuconfig 选上编译这个文件的选项
修改文件drivers/usb/storage/unusual_devs.h,去掉对移植网卡ID的屏蔽，关于此官方是这样说的：
Kernel related issues
In some newer kernels, certain device families (some Option, some Huawei, some ZTE as mentioned above) get a special treatment in the usb-storage code to enable switching right away. You would not need USB_ModeSwitch anymore for these specific dvices; on the other hand you have no choice of accessing the "CD-ROM" part of your device. Plus, there were cases when the special treatment brought no results and furthermore prevented USB_ModeSwitch to work properly afterwards (happened with ZTE devices, error "-2").
In case of trouble, look into "unusual_devs.h" in the "drivers/usb/storage" folder of your kernel source. If your default ID (vendor and product ID of the storage part) can be found there and you get errors when running USB_ModeSwitch, try first to blacklist "usb-storage".
If that helps, you should consider rebuilding your kernel with the entry in "unusual_devs.h" deactivated. The only thing that will happen is that usb-storage works in the default way afterwards.
I found a tip in the Russian Gentoo wiki to do exactly what I just suggested for the ZTE MF626.
修改完内核后执行make uImage生成内核镜像文件
五、利用usb_modeswitch进行模式转换
移植完usb_modeswitch，libusb，更新内核后执行命令进行模式转换
# ./usb_modeswitch –c usb_modeswitch.conf
执行后正常的话在/dev下生成了ttyUSB0、ttyUSB1、ttyUSB2等节点。执行lsusb命令就可以发现ID由0x1446变为0x1001.
六、交叉编译pppd拨号工具，并编写拨号脚本
1. 移植pppd拨号工具，并在内核里将相关的选项选上。
a) 下载编译ppp-2.4.5解压
b) 进入chat目录， 编译chat: make –f Makefile.linux --host=arm-none-linux-gnueabi,生成chat
c) 进入pppd目录， 编译pppd: make –f Makefile.linux --host=arm-none-linux-gnueabi,生成pppd，可能会出现找不到pcap.h需要交叉编译libpcap后面有说明
d) 将chat、pppd拷贝到/usr/sbin/目录
e) 当服务器要求pppd给出用户身份认证信息的时候，如果协商采用PAP认证方式，pppd将到/etc/ppp/pap-secrets文件中取得用户口令；如果协商采用CHAP认证方式，则pppd将到/etc/ppp/chap-secrets文件中取得用户口令。因此需要对/etc/ppp/pap-secrets和/etc/ppp/chap-secrets做修改，修改PAP认证所需要的用户名密码，在文件/etc/ppp/pap-secrets中添加
card * card *
修改CHAP认证协议所需的用户名和口令，在文件/etc/ppp/ chap-secrets中添加
card * card *
下面介绍拨号脚本的编写：
wcdma：
nodetach
#lock
/dev/ttyUSB0
#115200
460800
#user "card"
#password "card"
#crtscts
#show-password
#usepeerdns
noauth
noipdefault
novj
novjccomp
noccp
defaultroute
ipcp-accept-local
ipcp-accept-remote
connect '/usr/sbin/chat -s -v -f /etc/ppp/peers/chat-wcdma-connect'
#persist
#disconnect '/usr/sbin/chat -s -v -f /etc/ppp/peers/chat-wcdma-disconnect'
chat-wcdma-connect:
ABORT 'NO CARRIER'
ABORT 'ERROR'
ABORT 'NO DIALTONE'
ABORT 'BUSY'
ABORT 'NO ANSWER'
'' /rAT
OK /rATZ
OK /rAT+CGDCONT=1,"IP","3gnet",,0,0
OK-AT-OK ATDT*99#
CONNECT /d/c
chat-wcdma-disconnect:
ABORT "ERROR"
ABORT "NO DIALTONE"
SAY "/nSending break to the modem/n"
'' "/K"
'' "+++ATH"
SAY "/nGoodbay/n"
将wcdma、chat-wcdma-connect、chat-wcdma-disconnect三个文件拷贝到
/home/filesys/etc/ppp/peers 目录下，在/etc/resolv.conf中添加DNS号
Nameserver 202.106.46.151
修改/etc/network/interfacds文件，设置网卡的工作模式如下：
Auto eeth0
iface eth0 inet static
address 192.168.1.42
network 192.168.1.0
netmask 255.255.255.0
broadcast 192.168.1.255
gateway 192.168.1.1
开始拨号
[email protected]:/opt/3g# pppd call wcdma&
拨号成功后会获得自动分配的IP地址
Serial connection established.
usb 1-1: pppd timed out on ep0out
Using interface ppp0
Connect: ppp0 <--> /dev/ttyUSB0
PAP authentication succeeded
Could not determine remote IP address: defaulting to 10.64.64.64
Cannot determine ethernet address for proxy ARP
local IP address 172.25.125.70
remote IP address 10.64.64.64
ping www.sina.com 如能ping通，则说明移植成功。
[email protected]:/opt/3g# ping www.sina.com
PING libra.sina.com.cn (202.108.33.73) 56(84) bytes of data.
64 bytes from 202.108.33.73: icmp_seq=1 ttl=54 time=367 ms
64 bytes from 202.108.33.73: icmp_seq=2 ttl=54 time=320 ms
64 bytes from 202.108.33.73: icmp_seq=3 ttl=54 time=300 ms
64 bytes from 202.108.33.73: icmp_seq=4 ttl=54 time=310 ms
64 bytes from 202.108.33.73: icmp_seq=5 ttl=54 time=330 ms