目录
1、背景
2、移植QMI_WWAN驱动
2.1 准备源码
2.2 修改源码
2.3 make
2.4 安装
2.5 编译cdc_wdm
2.6 再次安装
2.7 验证QMI驱动
3、ppp拨号
3.1 修改内核配置
3.2 打包和更换内核
3.3验证
最后
1、背景
前文讲移植移远Gobinet驱动，拨号报错，无法上网。原厂支持现场支援，换用QMI_WWAN拨号。Gobinet问题需要给原厂提单，由研发人员解决。
2、移植QMI_WWAN驱动
Gobinet和QMI_WWAN驱动是二选一的关系，不能同时使用。Gobinet和QMI_WWAN均属于网卡范畴，和移远的4G模块EC20驱动没有直接关系。所以EC20驱动编入内核，Gobinet和QMI_WWAN编成KO模块，需要时安装，不需要时卸载。
移远的指引《Quectel_LTE&5G_Linux_USB_Driver_User_Guide_V2.0.pdf》中关于QMI_WWAN驱动的移植，是编入内核的，这里不做介绍。下面说说编成模块的方法：
2.1 准备源码
将移远提供的源码放在编译环境的任意位置。不一定是内核路径。
我用的编辑环境是VMware的ubuntu18.04，已经预先安装了智芯指定的交叉编译工具。
源码内容是这样的：
root@ubuntu:/home/wang/WWAN/qmi_wwan_q# lslog Makefile qmi_wwan_q.c ReleaseNote.txt rmnet_nss.c
2.2 修改源码
修改其中的Makefile文件：
修改前：
修改后：
这里无法修改一下ARCH OUTPUTDIR和KDIR，ARCH是架构（arm或是x86，也可以通过export指定），KDIR是内核源码路径，OUTPUTDIR是依赖的其他文件路径。
2.3 make
指定框架 工具链和工具链路径，直接敲：
export ARCH=armexport CROSS_COMPILE=arm-linux-gnueabihf-export PATH=$PATH:/usr/src/toolchain/gcc-linaro-7.5.0-arm-linux-gnueabihf/bin
在上述路径下敲make，没有报错便会在当前目录下得到qmi_wwan_q.ko文件。
root@ubuntu:/home/wang/WWAN/qmi_wwan_q# lslog Makefile modules.order Module.symvers qmi_wwan_q.c qmi_wwan_q.ko qmi_wwan_q.mod.c qmi_wwan_q.mod.o qmi_wwan_q.o ReleaseNote.txt rmnet_nss.c
2.4 安装
将生产的qmi_wwan_q.ko导入板子中，insmodqmi_wwan_q.ko发现报错：
root@scm801:/home/wang# insmod qmi_wwan_q.koinsmod: ERROR: could not insert module qmi_wwan_q.ko: Unknown symbol in module
这是因为qmi_wwan_q.ko有依赖的东西没有加载。我的内核没有编译cdc_wdm。
我是怎么知道这里缺少的是cdc_wdm，而不是其他东西呢？我记得在“2.3 make”这步没有那么顺利，会报和cdc_wdm相关的错误。该文就不深究了。
USB的CDC类是USB通信设备类 (Communication Device Class)的简称。CDC类是USB组织定义的一类专门给各种通信设备(电信通信设备和中速网络通信设备)使用的USB子类。而CDC_WDM驱动程序是用来管理USB CDC WCM设备。QMI就是依赖这种驱动拨号上网的。
2.5 编译cdc_wdm
编译cdc_wdm有两种方法：第一编入内核（我还没研究），第二是编成ko模块，在加载qmi_wwan_q.ko之前，先加载cdc_wdm.ko。具体步骤如下：
在内核源码中找到文件，我的路径是：
/usr/src/kernel/drivers/usb/class/cdc-wdm.c
其中/usr/src/kernel/是我的内核的父路径。
将它复制到一个刚新建的目录cdc_wdm中，再复制原qmi_wwan_q的Makefile然后改改：
root@ubuntu:/home/wang/WWAN/cdc_wdm# lscdc-wdm.c Makefile
只需要修改makefile文件的抬头，生产什么样的.o文件就行了：
编译qmi驱动时指定过了交叉链和路径了，我们在cdc_wdm目录下直接make就可以了：
root@ubuntu:/home/wang/WWAN/cdc_wdm# makemake ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- -C /usr/src/kernel M=/home/wang/WWAN/cdc_wdm modulesmake[1]: Entering directory '/usr/src/kernel'CC [M] /home/wang/WWAN/cdc_wdm/cdc-wdm.oBuilding modules, stage 2.MODPOST 1 modulesCC/home/wang/WWAN/cdc_wdm/cdc-wdm.mod.oLD [M] /home/wang/WWAN/cdc_wdm/cdc-wdm.komake[1]: Leaving directory '/usr/src/kernel'root@ubuntu:/home/wang/WWAN/cdc_wdm# lscdc-wdm.c cdc-wdm.ko cdc-wdm.mod.c cdc-wdm.mod.o cdc-wdm.o Makefile modules.order Module.symversroot@ubuntu:/home/wang/WWAN/cdc_wdm#
这样就生成了cdc-wdm.ko文件。我们将该文件传入板子加载。
2.6 再次安装
root@scm801:/home/wang# insmod cdc-wdm.koroot@scm801:/home/wang# insmod qmi_wwan_q.ko
在/dev路径下能看到cdc-wdm0驱动节点：
2.7 验证QMI驱动
前文编译出来的执行文件quectel-CM是通用文件，即用Gobinet网卡和QMI_WWAN网卡都能拨号，二选一。如果之前将Gobinet网卡编入了内核，先去掉，不然和QMI冲突。
root@scm801:/home/wang# ./quectel-CM[06-21_09:31:37:496] QConnectManager_Linux_V1.6.2[06-21_09:31:37:498] Find /sys/bus/usb/devices/2-1 idVendor=0x2c7c idProduct=0x125, bus=0x002, dev=0x002[06-21_09:31:37:498] Auto find qmichannel = /dev/cdc-wdm0[06-21_09:31:37:498] Auto find usbnet_adapter = wwan0[06-21_09:31:37:499] netcard driver = qmi_wwan_q, driver version = V1.2.1[06-21_09:31:37:499] Modem works in QMI mode[06-21_09:31:37:507] cdc_wdm_fd = 7[06-21_09:32:07:555] QmiWwanInit message timeout[06-21_09:32:37:595] QmiWwanGetClientID message timeout[06-21_09:32:42:605] QmiWwanSendQMI poll=0, revents = 0x0, errno: 2 (No such file or directory)[06-21_09:33:12:645] QmiWwanGetClientID message timeout[06-21_09:33:17:655] QmiWwanSendQMI poll=0, revents = 0x0, errno: 2 (No such file or directory)[06-21_09:33:47:695] QmiWwanGetClientID message timeout[06-21_09:33:52:705] QmiWwanSendQMI poll=0, revents = 0x0, errno: 2 (No such file or directory)[06-21_09:34:22:745] QmiWwanGetClientID message timeout[06-21_09:34:27:755] QmiWwanSendQMI poll=0, revents = 0x0, errno: 2 (No such file or directory)[06-21_09:34:57:795] QmiWwanGetClientID message timeout[06-21_09:34:57:795] QMIType 2 has no clientID[06-21_09:34:57:795] requestBaseBandVersion err = -19[06-21_09:34:57:795] QMIType 26 has no clientID[06-21_09:34:57:795] requestSetEthMode err = -19[06-21_09:34:57:795] QMIType 11 has no clientID[06-21_09:34:57:795] requestGetSIMStatus err = -19[06-21_09:34:57:795] QMIType 1 has no clientID[06-21_09:34:57:796] requestGetProfile err = -19[06-21_09:34:57:796] QMIType 3 has no clientID[06-21_09:34:57:796] requestRegistrationState2 err = -19[06-21_09:34:57:796] QMIType 1 has no clientID[06-21_09:34:57:796] requestQueryDataCall err = -19[06-21_09:34:57:796] ifconfig wwan0 0.0.0.0
报错，无法拨通。我们加-v试试，-v打印详细的拨号过程。
root@scm801:/home/wang# ./quectel-CM -v[06-21_07:02:22:668] QConnectManager_Linux_V1.6.2[06-21_07:02:22:669] (/sys/bus/usb/devices/2-1/idVendor) = 2c7c[06-21_07:02:22:669] (/sys/bus/usb/devices/2-1/idProduct) = 125[06-21_07:02:22:669] (/sys/bus/usb/devices/2-1/busnum) = 2[06-21_07:02:22:669] (/sys/bus/usb/devices/2-1/devnum) = 2[06-21_07:02:22:669] (/sys/bus/usb/devices/2-1/bNumInterfaces) = 5[06-21_07:02:22:669] Find /sys/bus/usb/devices/2-1 idVendor=0x2c7c idProduct=0x125, bus=0x002, dev=0x002[06-21_07:02:22:670] (/sys/bus/usb/devices/2-1:1.4/bNumEndpoints) = 3[06-21_07:02:22:670] (/sys/bus/usb/devices/2-1:1.4/bInterfaceClass) = ff[06-21_07:02:22:670] (/sys/bus/usb/devices/2-1:1.4/bInterfaceSubClass) = ff[06-21_07:02:22:670] (/sys/bus/usb/devices/2-1:1.4/bInterfaceProtocol) = ff[06-21_07:02:22:670] driver -> ../../../../../../../bus/usb/drivers/qmi_wwan_q[06-21_07:02:22:670] /sys/bus/usb/devices/2-1:1.4/usbmisc[06-21_07:02:22:670] Auto find qmichannel = /dev/cdc-wdm0[06-21_07:02:22:670] Auto find usbnet_adapter = wwan0[06-21_07:02:22:670] netcard driver = qmi_wwan_q, driver version = V1.2.1[06-21_07:02:22:671] Modem works in QMI mode[06-21_07:02:22:679] cdc_wdm_fd = 7[06-21_07:02:22:679] 01 0b 00 00 00 00 00 01 27 00 00 00[06-21_07:02:22:680] TransactionId:01QMICTLType: 0027 QMICTL_SYNC_REQLength: 0000[06-21_07:02:22:710] 01 12 00 80 00 00 01 01 27 00 07 00 02 04 00 00 00 00 00[06-21_07:02:22:710] TransactionId:01QMICTLType: 0027 QMICTL_SYNC_RESPLength: 0007{02, 0004, 00 00 00 00 }[06-21_07:02:22:710] 01 0f 00 00 00 00 00 02 21 00 04 00 01 01 00 ff[06-21_07:02:22:710] TransactionId:02QMICTLType: 0021 QMICTL_GET_VERSION_REQLength: 0004{01, 0001, ff }[06-21_07:02:52:743] QmiWwanInit message timeout[06-21_07:02:52:743] 01 0f 00 00 00 00 00 03 22 00 04 00 01 01 00 01[06-21_07:02:52:743] TransactionId:03QMICTLType: 0022 QMICTL_GET_CLIENT_ID_REQLength: 0004{01, 0001, 01 }[06-21_07:03:22:783] QmiWwanGetClientID message timeout[06-21_07:03:22:783] 01 0f 00 00 00 00 00 04 22 00 04 00 01 01 00 02[06-21_07:03:22:783] TransactionId:04QMICTLType: 0022 QMICTL_GET_CLIENT_ID_REQLength: 0004{01, 0001, 02 }[06-21_07:03:27:793] QmiWwanSendQMI poll=0, revents = 0x0, errno: 2 (No such file or directory)[06-21_07:03:57:833] QmiWwanGetClientID message timeout[06-21_07:03:57:833] 01 0f 00 00 00 00 00 05 22 00 04 00 01 01 00 03[06-21_07:03:57:833] TransactionId:05QMICTLType: 0022 QMICTL_GET_CLIENT_ID_REQLength: 0004{01, 0001, 03 }[06-21_07:04:02:843] QmiWwanSendQMI poll=0, revents = 0x0, errno: 2 (No such file or directory)[06-21_07:04:32:883] QmiWwanGetClientID message timeout[06-21_07:04:32:883] 01 0f 00 00 00 00 00 06 22 00 04 00 01 01 00 0b[06-21_07:04:32:883] TransactionId:06QMICTLType: 0022 QMICTL_GET_CLIENT_ID_REQLength: 0004{01, 0001, 0b }[06-21_07:04:37:893] QmiWwanSendQMI poll=0, revents = 0x0, errno: 2 (No such file or directory)[06-21_07:05:07:933] QmiWwanGetClientID message timeout[06-21_07:05:07:933] 01 0f 00 00 00 00 00 07 22 00 04 00 01 01 00 1a[06-21_07:05:07:933] TransactionId:07QMICTLType: 0022 QMICTL_GET_CLIENT_ID_REQLength: 0004{01, 0001, 1a }[06-21_07:05:12:943] QmiWwanSendQMI poll=0, revents = 0x0, errno: 2 (No such file or directory)[06-21_07:05:42:983] QmiWwanGetClientID message timeout[06-21_07:05:42:983] 01 0c 00 00 02 00 00 01 00 23 00 00 00[06-21_07:05:42:983] TransactionId: 0001Type:0023 QMIDMS_GET_DEVICE_REV_ID_REQLength: 0000[06-21_07:05:42:983] QMIType 2 has no clientID[06-21_07:05:42:983] requestBaseBandVersion err = -19[06-21_07:05:42:984] 01 1e 00 00 1a 00 00 02 00 20 00 12 00 10 01 00 00 11 04 00 01 00 00 00 13 04 00 00 00 00 00[06-21_07:05:42:984] TransactionId: 0002Type:0020 QMIWDS_ADMIN_SET_DATA_FORMAT_REQLength: 0012{10, 0001, 00 }{11, 0004, 01 00 00 00 }{13, 0004, 00 00 00 00 }[06-21_07:05:42:984] QMIType 26 has no clientID[06-21_07:05:42:984] requestSetEthMode err = -19[06-21_07:05:42:984] 01 0c 00 00 0b 00 00 03 00 2f 00 00 00[06-21_07:05:42:984] TransactionId: 0003Type:002f QMIUIM_GET_CARD_STATUS_REQLength: 0000[06-21_07:05:42:984] QMIType 11 has no clientID[06-21_07:05:42:984] requestGetSIMStatus err = -19[06-21_07:05:42:984] 01 11 00 00 01 00 00 04 00 2b 00 05 00 01 02 00 00 01[06-21_07:05:42:984] TransactionId: 0004Type:002b QMIWDS_GET_PROFILE_SETTINGS_REQLength: 0005{01, 0002, 00 01 }[06-21_07:05:42:984] QMIType 1 has no clientID[06-21_07:05:42:984] requestGetProfile err = -19[06-21_07:05:42:984] 01 0c 00 00 03 00 00 05 00 4d 00 00 00[06-21_07:05:42:984] TransactionId: 0005Type:004d QMINAS_GET_SYS_INFO_REQLength: 0000[06-21_07:05:42:984] QMIType 3 has no clientID[06-21_07:05:42:984] requestRegistrationState2 err = -19[06-21_07:05:42:984] 01 0c 00 00 01 00 00 06 00 22 00 00 00[06-21_07:05:42:984] TransactionId: 0006Type:0022 QMIWDS_GET_PKT_SRVC_STATUS_REQLength: 0000[06-21_07:05:42:984] QMIType 1 has no clientID[06-21_07:05:42:985] requestQueryDataCall err = -19[06-21_07:05:42:985] ifconfig wwan0 0.0.0.0
这些详细的交互过程，我们也看不懂呀。
除了拨不通以外，我们还发现后台有两个quectel-CM进程，而且还杀不掉。
不知道是系统问题还是拨号工具quectel-CM的问题，待研究。
3、ppp拨号
这个就简单了，它是通过运行脚本文件，对虚拟串口ttyUSB2/3写AT指令。这里就不翻译移远教程了。
ppp拨号脚本及相关的connect和杀进程脚本，请下载我的资源：
ppp拨号脚本，包含拨号和杀进程脚本等等-网管软件文档类资源-CSDN下载
脚本quectel-pppd.sh是移远给的，具体内容如下：
#!/bin/sh#quectel-pppd devname apn user passwordecho "quectel-pppd options in effect:"QL_DEVNAME=/dev/ttyUSB3QL_APN=3gnetQL_USER=userQL_PASSWORD=passwdif [ $# -ge 1 ]; thenQL_DEVNAME=$1echo "devname $QL_DEVNAME # (from command line)"elseecho "devname $QL_DEVNAME # (default)"fiif [ $# -ge 2 ]; thenQL_APN=$2echo "apn $QL_APN # (from command line)"elseecho "apn $QL_APN # (default)"fiif [ $# -ge 3 ]; thenQL_USER=$3echo "user$QL_USER # (from command line)"elseecho "user$QL_USER # (default)"fiif [ $# -ge 4 ]; thenQL_PASSWORD=$4echo "password $QL_PASSWORD # (from command line)"elseecho "password $QL_PASSWORD # (default)"fiCONNECT="'chat -s -v ABORT BUSY ABORT \"NO CARRIER\" ABORT \"NO DIALTONE\" ABORT ERROR ABORT \"NO ANSWER\" TIMEOUT 30 \\"\" AT OK ATE0 OK ATI\;+CSUB\;+CSQ\;+CPIN?\;+COPS?\;+CGREG?\;\&D2 \OK AT+CGDCONT=1,\\\"IP\\\",\\\"$QL_APN\\\",,0,0 OK ATD*99# CONNECT'"pppd $QL_DEVNAME 115200 user "$QL_USER" password "$QL_PASSWORD" \connect "'$CONNECT'" \disconnect 'chat -s -v ABORT ERROR ABORT "NO DIALTONE" SAY "\nSending break to the modem\n" "" +++ "" +++ "" +++ SAY "\nGood bay\n"' \noauth debug defaultroute noipdefault novj novjccomp noccp ipcp-accept-local ipcp-accept-remote ipcp-max-configure 30 local lock modem dump nodetach nocrtscts usepeerdns &
3.1 修改内核配置
该脚本需要内核支持ppp拨号。
内核源码的父目录下执行：make menuconfig，按照下面的层级找到“PPP (point-to-point protocol) support”，并按y，使其编入内核。
[*] Device Drivers →[*] Network device support →[*] PPP (point-to-point protocol) support
注意：PPP选项在打星号前是一个条目，在按y选中后，该条目下面会多出好多条目，我们不用关心，用默认配置保存退出即可。
修改了配置了，make -j4，编译内核，在目录/usr/src/kernel/arch/arm/boot下有文件zImage，这就是内核镜像，用该镜像打包成内核文件供板子直接使用。复制它到板子上，更新内核。（打包和更新的命令是智芯微给的，不一定具有通用性，大家可以参考一下）。
3.2 打包和更换内核
智芯微提供的文件夹是这样的：
3.3验证
更换内核后，在目录/dev/下能看到ppp的驱动节点。
注意：在拨号前先删除系统的默认路由，不然即使拨通了也无法上网。在系统上直接敲：
route del default
再使用脚本quectel-pppd.sh拨号：
root@scm801:/home/wang/linux-ppp-scripts# ./quectel-pppd.sh /dev/ttyUSB2quectel-pppd options in effect:devname /dev/ttyUSB2 # (from command line)apn 3gnet # (default)useruser # (default)password passwd # (default)pppd options in effect:debug # (from command line)nodetach# (from command line)dump # (from command line)noauth# (from command line)user user# (from command line)password ?????? # (from command line)/dev/ttyUSB2 # (from command line)115200# (from command line)lock # (from command line)connect ''chat -s -v ABORT BUSY ABORT \"NO CARRIER\" ABORT \"NO DIALTONE\" ABORT ERROR ABORT \"NO ANSWER\" TIMEOUT 30 \"\" AT OK ATE0 OK ATI\\;+CSUB\\;+CSQ\\;+CPIN?\\;+COPS?\\;+CGREG?\\;\\&D2 OK AT+CGDCONT=1,\\\"IP\\\",\\\"3gnet\\\",,0,0 OK ATD*99# CONNEC# (from command line)disconnect chat -s -v ABORT ERROR ABORT \"NO DIALTONE\" SAY \"\\nSending break to the modem\\n\" \"\" +++ \"\" +++ \"\" +++ SAY \"\\nGood bay\\n\" # (from command line)nocrtscts# (from command line)modem # (from command line)asyncmap 0 # (from /etc/ppp/options)lcp-echo-failure 4 # (from /etc/ppp/options)lcp-echo-interval 30 # (from /etc/ppp/options)hide-password # (from /etc/ppp/options)novj # (from command line)novjccomp# (from command line)ipcp-accept-local# (from command line)ipcp-accept-remote # (from command line)noipdefault # (from command line)ipcp-max-configure 30 # (from command line)defaultroute # (from command line)usepeerdns # (from command line)noccp # (from command line)noipx # (from /etc/ppp/options)root@scm801:/home/wang/linux-ppp-scripts# abort on (BUSY)abort on (NO CARRIER)abort on (NO DIALTONE)abort on (ERROR)abort on (NO ANSWER)timeout set to 30 secondssend (AT^M)expect (OK)AT^M^MOK-- got itsend (ATE0^M)expect (OK)^MATE0^M^MOK-- got itsend (ATI;+CSUB;+CSQ;+CPIN?;+COPS?;+CGREG?;&D2^M)expect (OK)^M^MQuectel^MEC20F^MRevision: EC20CEHDLGR06A05M1G^M^MSubEdition: V03^M^M+CSQ: 31,99^M^M+CPIN: READY^M^M+COPS: 0,0,"CHN-UNICOM",7^M^M+CGREG: 0,1^M^MOK-- got itsend (AT+CGDCONT=1,"IP","3gnet",,0,0^M)expect (OK)^M^MOK-- got itsend (ATD*99#^M)expect (CONNECT)^M^MCONNECT-- got itScript ''chat -s -v ABORT BUSY ABORT "NO CARRIER" ABORT "NO DIALTONE" ABORT ERROR ABORT "NO ANSWER" TIMEOUT 30 "" AT OK ATE0 OK ATI\;+CSUB\;+CSQ\;+CPIN?\;+COPS?\;+CGREG?\;\&D2 OK AT+CGDCONT=1,\"IP\",\"3gnet\",,0,0 OK ATD*99# CONNECT'' finished (pid 364), status = 0x0Serial connection established.using channel 1Using interface ppp0Connect: ppp0 <--> /dev/ttyUSB2sent [LCP ConfReq id=0x1 <asyncmap 0x0> <magic 0xaee1219c> <pcomp> <accomp>]rcvd [LCP ConfReq id=0x0 <asyncmap 0x0> <auth chap MD5> <magic 0xc63dcf81> <pcomp> <accomp>]sent [LCP ConfAck id=0x0 <asyncmap 0x0> <auth chap MD5> <magic 0xc63dcf81> <pcomp> <accomp>]rcvd [LCP ConfAck id=0x1 <asyncmap 0x0> <magic 0xaee1219c> <pcomp> <accomp>]sent [LCP EchoReq id=0x0 magic=0xaee1219c]rcvd [LCP DiscReq id=0x1 magic=0xc63dcf81]rcvd [CHAP Challenge id=0x1 <2e750da5c19ad54e1b3f558a3cf46c95>, name = "UMTS_CHAP_SRVR"]sent [CHAP Response id=0x1 <61712dbe7c3685e20e294713ff4f0a6b>, name = "user"]rcvd [LCP EchoRep id=0x0 magic=0xc63dcf81 ae e1 21 9c]rcvd [CHAP Success id=0x1 ""]CHAP authentication succeededCHAP authentication succeededsent [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=0x0]sent [IPCP ConfNak id=0x0 <addr 0.0.0.0>]rcvd [IPCP ConfNak id=0x1 <addr 10.18.14.216> <ms-dns1 221.6.4.66> <ms-dns2 58.240.57.33>]sent [IPCP ConfReq id=0x2 <addr 10.18.14.216> <ms-dns1 221.6.4.66> <ms-dns2 58.240.57.33>]rcvd [IPCP ConfReq id=0x1]sent [IPCP ConfAck id=0x1]rcvd [IPCP ConfAck id=0x2 <addr 10.18.14.216> <ms-dns1 221.6.4.66> <ms-dns2 58.240.57.33>]Could not determine remote IP address: defaulting to 10.64.64.64local IP address 10.18.14.216remote IP address 10.64.64.64primary DNS address 221.6.4.66secondary DNS address 58.240.57.33Script /etc/ppp/ip-up started (pid 373)Script /etc/ppp/ip-up finished (pid 373), status = 0x0
ip分配到了，敲ifconfig能看到网卡ppp0：
ping一把百度能通：
root@scm801:/home/wang/linux-ppp-scripts# ping PING www. (112.80.248.75) 56(84) bytes of data.64 bytes from 112.80.248.75 (112.80.248.75): icmp_seq=1 ttl=56 time=23.9 ms64 bytes from 112.80.248.75 (112.80.248.75): icmp_seq=2 ttl=56 time=19.5 ms^C--- www. ping statistics ---2 packets transmitted, 2 received, 0% packet loss, time 1004msrtt min/avg/max/mdev = 19.541/21.742/23.944/2.206 ms
注意：不是每次ppp拨号都能成功。可能需要多操作几次，可能需要reboot，可能板子需要断电重启。总是，ppp拨号不稳定。可能和智芯微裁剪的ubuntu系统有关。
最后
搞了这么多，终于有种方式能拨号上网了。Gobinet和qmi报错的问题，我会在下一篇文章，按照移远的要求抓log，给移远分析。这里的log是指usbmon log和Qlog。
