在ARM Linux上实现4G模块PPP拨号上网

在ARM平台上实现4G模块的PPP拨号上网，参考网上的资料和自己的理解，从一无所知到开发完成花了一周多。最后看到ARM板ping通www.linuxidc.com时甚是高兴，现将此过程整理如下。当然，除此之外要做的工作还有很多。4G模块使用的SIMTECH 的SIM7100C，SIM7100C带有UART和USB接口，在考虑速度上我们使用USB接口和ARM进行通信。所以向linux内核添加3G模块的驱动（USB转串口驱动）和PPP协议的支持，然后编译内核并下载到开发板。1. 编译内核◇ 大容量存储驱动> Device Drivers > USB supportmake ARCH=arm menuconfig配置USB驱动：<*> USB Mass Storage support[*] USB Mass Storage verbose debug<*> Realtek Card Reader support[*] Realtek Card Reader autosuspend support<*> Datafab Compact Flash Reader support◇ USB驱动> Device Drivers > USB support<*> Inventra Highspeed Dual Role Controller （TI, ADI, ...） MUSB Mode Selection （Dual Role mode） ---> <*> Platform Glue Layer （TI DSPS platforms） ---> MUSB DMA mode （Disable DMA （always use PIO）） ---><*> USB Serial Converter support --->[*] USBGeneric Serial Driver <*> USBdriver for GSM and CDMA modems◇ PPP驱动> 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 <*> SLIP （serial line） support [*] CSLIP compressed headers2. 交叉编译libusb下载usblib库和libusb-compathttps://sourceforge.net/projects/libusb/files/root@linuxidc:/opt/usb-tools/libusb-1.0.20# mkdir installconfigure: error: "udev support requested but libudev not installed"（解决：添加--disable-udev）root@linuxidc:/opt/usb-tools/libusb-1.0.20# ./configure --host=arm-none-linux-gnueabi --prefix=/opt/usb-tools/libusb-1.0.20/install --disable-udevroot@linuxidc:/opt/usb-tools/libusb-1.0.20# makeroot@linuxidc:/opt/usb-tools/libusb-1.0.20# make install添加环境变量 http://www.linuxidc.com/Linux/2011-03/33432.htm（PKG_CONFIG_PATH设置）root@linuxidc:/opt/usb-tools/libusb-1.0.20# export PKG_CONFIG_PATH=/opt/usb-tools/libusb-1.0.20/install/lib/pkgconfig:$PKG_CONFIG_PATHroot@linuxidc:/opt/usb-tools/libusb-1.0.20# echo $PKG_CONFIG_PATH编译libusb-compat：root@linuxidc:/opt/usb-tools/libusb-compat-0.1.5# ./configure --host=arm-none-linux-gnueabi --prefix=/opt/usb-tools/libusb-compat-0.1.5/installroot@linuxidc:/opt/usb-tools/libusb-compat-0.1.5# makeroot@linuxidc:/opt/usb-tools/libusb-compat-0.1.5# make install将生成的libusb-1.0.20和libusb-compat-0.1.5下的库文件复制到ARM板上的linux的/lib下面即可。3. 交叉编译4G模块驱动交叉编译GobiSerial.c（ARCH=arm CC=arm-none-linux-gnueabi-gcc），得到GobiSerial.ko。复制到ARM板安装驱动#insmod GobiSerial.ko4. 查看驱动运行状况插上4G模块，虚拟出6个ttyUSB，它们分别是：root@am335x-evm:/# ls /dev/ttyUSB*/dev/ttyUSB0 /dev/ttyUSB1 /dev/ttyUSB2 /dev/ttyUSB3 /dev/ttyUSB4 /dev/ttyUSB51） /dev/ttyUSB0-diag port for output developing messages2） /dev/ttyUSB1- NMEA port for GPS NMEA data output3） /dev/ttyUSB2-AT port for AT commands4） /dev/ttyUSB3-Modem port for ppp-dial5） /dev/ttyUSB4-audio port6） /dev/ttyUSB5-Virtual Net card插上U盘，提示设备运行：[75097.986054] usb 2-1: New USB device found, idVendor=058f, idProduct=6387[75097.993167] usb 2-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3[75098.000689] usb 2-1: Product: Mass Storage[75098.004995] usb 2-1: Manufacturer: Generic[75098.009342] usb 2-1: SerialNumber: AC3DF2EE[75098.024341] usb-storage 2-1:1.0: USB Mass Storage device detected[75098.049922] scsi0 : usb-storage 2-1:1.0lsusb命令查看结果：Bus 001 Device 002: ID 1e0e:9001Bus 002 Device 002: ID 058f:6387Bus 001 Device 001: ID 1d6b:0002Bus 002 Device 001: ID 1d6b:00025. 交叉编译PPP参见： http://www.linuxidc.com/Linux/2016-03/129580.htm6. 拨号脚本设置root@am335x-evm:/etc/ppp# vi gprs-connect-chat#Chat script for China Mobile, used SIMCOM sim4100 TD module.TIMEOUT 15ABORT "DELAYED"ABORT "BUSY"ABORT "ERROR"ABORT "NO DIALTONE"ABORT "NO CARRIER"TIMEOUT 40"" ATOK ATS0=0OK ATE0V1OK AT+CGDCONT=1,"IP","CMNET"OK AT+CGEQREQ=1,2,128,384,,,0,,,,,,OK ATDT*99*1#CONNECTroot@am335x-evm:/etc/ppp/peers# vi gprsdial#/etc/ppp/peers/gprsdial# This is pppd script for China Mobile, used SIMCOM SIM7100 Module# Usage: root>pppd call gprs#Interface should be used is the interface which connects physics interface of S/dev/ttyUSB3115200crtsctsmodem#noauthdebugnodetach#hide-passwordusepeerdnsnoipdefaultdefaultrouteuser "cmnet"0.0.0.0:0.0.0.0#ipcp-accept-local#ipcp-accept-remote#lcp-echo-failure 12#lcp-echo-interval 3#noccp#novj#novjccomp#persistconnect "/usr/sbin/chat -s -v -f /etc/ppp/gprs-connect-chat"#disconnect "/bin/chat -v -f /etc/ppp/gprs-disconnect-chat"6. 拨号root@am335x-evm: pppd call gprsdial6. 测试拨号之后进行测试，发现可以ping通ip但是无法ping通域名。这需要设置/etc/resolv.conf来添加DNS解析服务器的地址文件/etc/resolv.conf配置DNS客户，它包含了主机的域名搜索顺序和DNS服务器的地址，每一行应包含一个关键字和一个或多个的由空格隔开的参数。下面是一个例子文件： domain test.comsearch www.test.com test.comnameserver 202.96.128.86nameserver 202.96.128.166nameserver #定义DNS服务器的IP地址domain #定义本地域名search #定义域名的搜索列表sortlist #对返回的域名进行排序主要是nameserver关键字，如果没指定nameserver就找不到DNS服务器，其它关键字是可选的。我这里只设置了两个DNS，如下：ameserver 114.114.114.114nameserver 8.8.8.8参考文档：http://www.linuxidc.com/Linux/2016-03/129579.htmhttp://www.linuxidc.com/Linux/2011-03/33430p2.htmhttp://www.linuxidc.com/Linux/2011-03/33430.htm本文永久更新链接地址