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参考：
http://blog.csdn.net/yel617/article/details/5602934
http://wenku.baidu.com/link?url=v96wCcrz8oYObkMTiPa55OyWxg35MhHF4L7voiDhKhtNPCB3uJhvNshz9UVUgpo4BTWmJE_4AhcAoW5oVOmtxr_NHYxb8ev0VKCpGwCSq1m
http://blog.csdn.net/suntao222/article/details/8930744
http://wandering.blog.51cto.com/467932/354562
http://blog.chinaunix.net/uid-9525959-id-3998519.html
一 上网模块需要内核编译配置 《Guide to Kernel Driver Integration ......》
修改源文件，修改内核配置项等，详细参考3G模块手册。
二 交叉编译一些工具(参考 《Yocto Project Application Developer's Guide》)：
将以下内容添加到根目录的Makefile文件中：
CC=arm-poky-linux-gnueabi-gcc -m32 -march=i586 --sysroot=/opt/poky/1.8/sysroots/x86_64-pokysdk-linux
LD=arm-poky-linux-gnueabi-ld --sysroot=/opt/poky/1.8/sysroots/x86_64-pokysdk-linux
CFLAGS=-O2 -pipe -g -feliminate-unused-debug-types
CXXFLAGS=-O2 -pipe -g -feliminate-unused-debug-types change to : CC=arm-poky-linux-gnueabi-gcc --sysroot=/home/summer/test-yocto/qemuarm
LD=arm-poky-linux-gnueabi-ld --sysroot=/home/summer/test-yocto/qemuarm
CFLAGS=-O2 -pipe -g -feliminate-unused-debug-types
CXXFLAGS=-O2 -pipe -g -feliminate-unused-debug-types # ./configure # make
PPP
. 下载代码：https://ppp.samba.org/
. 编译代码： http://blog.csdn.net/lanyou1900/article/details/40185259
. 编译成功后将编译生成的chat,pppd,pppdump等命令拷贝到板子文件系统的/usr/sbin目录下边去
USB（我的环境里以下功能都包含了，以下仅用来参考）
libusb-1.0. (用于编译usb-modeswitch-2.0.)
http://sourceforge.net/projects/libusb/postdownload?source=dlp usb-modeswitch-2.0. (用于切换网卡的模式)
http://www.draisberghof.de/usb_modeswitch/#download usb-modeswitch-data- (用于切换时指定切换的型号)
http://www.draisberghof.de/usb_modeswitch/#download
三 编写拨号脚本
在板子文件系统/etc/ppp/peers目录下边创建三个文件如下：
1. wcdma
debug
nodetach
/dev/ttyUSB0 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'
2. chat-wcdma-connect
TIMEOUT
ABORT 'NO CARRIER'
ABORT 'ERROR'
ABORT 'NODIALTONE'
ABORT 'BUSY'
ABORT 'NO ANSWER'
'' \rAT
OK \rATZ
OK \rAT+CGDCONT=,"IP","3GNET",,,
OK-AT-OK ATDT*#
CONNECT \d\c
3. chat-wcdma-disconnect
ABORT"ERROR"
ABORT "NODIALTONE"
SAY"\nSending break to the modem\n"
'' "\K"
''"+++ATH"
SAY"\nGoodbay\n"
四 添加DNS信息
# vi /etc/resolv.conf // 加入以下内容, 如果已经存在，替换成以下内容
nameserver 202.99.160.68
nameserver 202.99.166.4 或者，替换成
nameserver 1.2.4.8
nameserver 210.2.4.8 // TOBEDO : 重启开发板，dns信息被冲掉
五 检测ppp0网络是否能够使用
# Ping –I ppp0 www.baidu.com // 能够ping通就表示3G卡移植驱动成功
出现错误，域名不能ping通，ip可以
root@imx6ulevk:~# ping www.baidu.com
ping: bad address 'www.baidu.com'
六 测试模块状态
# lsusb // 查看usb连接状态
Bus Device : ID 12d1:1c25 Huawei Technologies Co., Ltd.
Bus Device : ID 1d6b: Linux Foundation 2.0 root hub # netstat -nr
# dmesg cdc_ether -:2.0 eth2: register 'cdc_ether' at usb-ci_hdrc.-, CDC Ethernet Device, :1e::1f::
usbcore: registered new interface driver option
usbcore: registered new interface driver cdc_ether
usbserial: USB Serial support registered for GSM modem (-port)
option -:2.2: GSM modem (-port) converter detected
usb -: GSM modem (-port) converter now attached to ttyUSB0
option -:2.3: GSM modem (-port) converter detected
usb -: GSM modem (-port) converter now attached to ttyUSB1
option -:2.4: GSM modem (-port) converter detected
usb -: GSM modem (-port) converter now attached to ttyUSB2
usb -: USB disconnect, device number
cdc_ether -:2.0 eth2: unregister 'cdc_ether' usb-ci_hdrc.-, CDC Ethernet Device
option1 ttyUSB0: GSM modem (-port) converter now disconnected from ttyUSB0
option -:2.2: device disconnected
option1 ttyUSB1: GSM modem (-port) converter now disconnected from ttyUSB1
option -:2.3: device disconnected
option1 ttyUSB2: GSM modem (-port) converter now disconnected from ttyUSB2
option -:2.4: device disconnected
usb -: new full-speed USB device number using ci_hdrc
usb -: new high-speed USB device number using ci_hdrc
cdc_ether -:2.0 eth2: register 'cdc_ether' at usb-ci_hdrc.-, CDC Ethernet Device, :1e::1f::
option -:2.2: GSM modem (-port) converter detected
usb -: GSM modem (-port) converter now attached to ttyUSB0
option -:2.3: GSM modem (-port) converter detected
usb -: GSM modem (-port) converter now attached to ttyUSB1
option -:2.4: GSM modem (-port) converter detected
usb -: GSM modem (-port) converter now attached to ttyUSB2
# dmesg | grep -in ppp // 查看ppp连接状态
＃cat /dev/ttyUSB0 &
# echo AT+CGMI > /dev/ttyUSB0 // 查询厂商相关信息
# echo AT+CSQ > /dev/ttyUSB0 // 查询信号，顺带还可以让你知道SIM卡相关的是否正常
# #netstat -nal // 查看网络连接状态
# ifconfig -a
Attention：
USB线的选择直接影响到能否正常识别模块
附录：
一 插上USB 3G模块显示的log
root@imx6ulevk:/mnt# usb -: new high-speed USB device number using ci_hdrc
usb -: new high-speed USB device number using ci_hdrc
cdc_ether -:2.0 eth2: register 'cdc_ether' at usb-ci_hdrc.-, CDC Ethernet Device, :1e::1f::
usbcore: registered new interface driver option
usbserial: USB Serial support registered for GSM modem (-port)
option -:2.2: GSM modem (-port) converter detected
usb -: GSM modem (-port) converter now attached to ttyUSB0
option -:2.3: GSM modem (-port) converter detected
usb -: GSM modem (-port) converter now attached to ttyUSB1
option -:2.4: GSM modem (-port) converter detected
usb -: GSM modem (-port) converter now attached to ttyUSB2
二 lsusb显示的log
root@imx6ulevk:/mnt# lsusb
Bus Device : ID 12d1:1c25 Huawei Technologies Co., Ltd.
Bus Device : ID 1d6b: Linux Foundation 2.0 root hub
三 ls /dev/ppp显示的log
root@imx6ulevk:/mnt# ls /dev/ppp
/dev/pp
四 手动拨号的错误log
root@imx6ulevk:~# timeout set to seconds
abort on (NO CARRIER)
abort on (ERROR)
abort on (NODIALTONE)
abort on (BUSY)
abort on (NO ANSWER)
send (^MAT^M)
expect (OK)
^M
OK
-- got it send (^MATZ^M)
expect (OK)
^M
^M
OK
-- got it send (^MAT+CGDCONT=,"IP","3GNET",,,^M)
expect (OK)
^M
^MAT+CGDCONT=,"IP","3GNET",,,^M^M
OK
-- got it send (ATDT*#^M)
expect (CONNECT)
^M
ATDT*#^M^M
CONNECT
-- got it send (\d)
Script /usr/sbin/chat -s -v -f /etc/ppp/peers/chat-wcdma-connect finished (pid ), status = 0x0
Serial connection established.
Couldn't set tty to PPP discipline: Invalid argument
expect (ABORT"ERROR")
^C
看起来像拨号成功的log
root@imx6ulevk:~# pppd call wcdma &
[]
root@imx6ulevk:~# timeout set to seconds
abort on (NO CARRIER)
abort on (ERROR)
abort on (NODIALTONE)
abort on (BUSY)
abort on (NO ANSWER)
send (^MAT^M)
expect (OK)
^MAT^M^M
OK
-- got it send (^MATZ^M)
expect (OK)
^M
^MATZ^M^M
OK
-- got it send (^MAT+CGDCONT=,"IP","3GNET",,,^M)
expect (OK)
^M
^MAT+CGDCONT=,"IP","3GNET",,,^M^M
OK
-- got it send (ATDT*#^M)
expect (CONNECT)
^M
ATDT*#^M^M
CONNECT
-- got it send (\d)
Script /usr/sbin/chat -s -v -f /etc/ppp/peers/chat-wcdma-connect finished (pid ), status = 0x0
Serial connection established.
using channel
Using interface ppp0
Connect: ppp0 <--> /dev/ttyUSB0
sent [LCP ConfReq id=0x1 <asyncmap 0x0> <magic 0x38c54823> <pcomp> <accomp>]
rcvd [LCP ConfReq id=0x1 <accomp> <pcomp> <asyncmap 0x0> <mru > <magic 0x545> <auth chap MD5>]
No auth is possible
sent [LCP ConfRej id=0x1 <auth chap MD5>]
rcvd [LCP ConfAck id=0x1 <asyncmap 0x0> <magic 0x38c54823> <pcomp> <accomp>]
rcvd [LCP ConfReq id=0x2 <accomp> <pcomp> <asyncmap 0x0> <mru > <magic 0x545>]
sent [LCP ConfAck id=0x2 <accomp> <pcomp> <asyncmap 0x0> <mru > <magic 0x545>]
sent [IPCP ConfReq id=0x1 <addr 0.0.0.0> <ms-dns1 0.0.0.0> <ms-dns2 0.0.0.0>]
rcvd [IPCP ConfReq id=0x1]
sent [IPCP ConfNak id=0x1 <addr 0.0.0.0>]
rcvd [IPCP ConfNak id=0x1 <ms-dns1 0.0.0.0> <ms-dns2 0.0.0.0>]
sent [IPCP ConfReq id=0x2 <addr 0.0.0.0> <ms-dns1 0.0.0.0> <ms-dns2 0.0.0.0>]
rcvd [IPCP ConfReq id=0x2]
sent [IPCP ConfAck id=0x2]
rcvd [IPCP ConfNak id=0x2 <addr 10.74.89.144> <ms-dns1 120.80.80.80> <ms-dns2 221.5.88.88>]
sent [IPCP ConfReq id=0x3 <addr 10.74.89.144> <ms-dns1 120.80.80.80> <ms-dns2 221.5.88.88>]
rcvd [IPCP ConfAck id=0x3 <addr 10.74.89.144> <ms-dns1 120.80.80.80> <ms-dns2 221.5.88.88>]
Could not determine remote IP address: defaulting to 10.64.64.64
local IP address 10.74.89.144
remote IP address 10.64.64.64
primary DNS address 120.80.80.80
secondary DNS address 221.5.88.88
ifconfig -a
ppp0 Link encap:Point-to-Point Protocol
inet addr:10.74.89.144 P-t-P:10.64.64.64 Mask:255.255.255.255
UP POINTOPOINT RUNNING NOARP MULTICAST MTU: Metric:
RX packets: errors: dropped: overruns: frame:
TX packets: errors: dropped: overruns: carrier:
collisions: txqueuelen:
RX bytes: (68.0 B) TX bytes: (80.0 B)
netstat -nr
root@imx6ulevk:~# netstat -nr
Kernel IP routing table
Destination Gateway Genmask Flags MSS Window irtt Iface
0.0.0.0 0.0.0.0 0.0.0.0 U ppp0
10.64.64.64 0.0.0.0 255.255.255.255 UH ppp0
error
root@imx6ulevk:~# ping -I ppp0 www.baidu.com
ping: bad address 'www.baidu.com'
success
root@imx6ulevk:~# ping 202.108.23.237
PING 202.108.23.237 (202.108.23.237): data bytes
bytes from 202.108.23.237: seq= ttl= time=1515.208 ms
bytes from 202.108.23.237: seq= ttl= time=75.742 ms