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# ls
log  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=arm
export 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# ls
log  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，insmod qmi_wwan_q.ko发现报错：

root@scm801:/home/wang# insmod qmi_wwan_q.ko
insmod: 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# ls
cdc-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# make
make ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- -C /usr/src/kernel M=/home/wang/WWAN/cdc_wdm modules
make[1]: Entering directory '/usr/src/kernel'
  CC [M]  /home/wang/WWAN/cdc_wdm/cdc-wdm.o
  Building modules, stage 2.
  MODPOST 1 modules
  CC      /home/wang/WWAN/cdc_wdm/cdc-wdm.mod.o
  LD [M]  /home/wang/WWAN/cdc_wdm/cdc-wdm.ko
make[1]: Leaving directory '/usr/src/kernel'
root@ubuntu:/home/wang/WWAN/cdc_wdm# ls
cdc-wdm.c  cdc-wdm.ko  cdc-wdm.mod.c  cdc-wdm.mod.o  cdc-wdm.o  Makefile  modules.order  Module.symvers
root@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.ko
root@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:      01
QMICTLType:         0027        QMICTL_SYNC_REQ
Length:             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:      01
QMICTLType:         0027        QMICTL_SYNC_RESP
Length:             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:      02
QMICTLType:         0021        QMICTL_GET_VERSION_REQ
Length:             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:      03
QMICTLType:         0022        QMICTL_GET_CLIENT_ID_REQ
Length:             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:      04
QMICTLType:         0022        QMICTL_GET_CLIENT_ID_REQ
Length:             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:      05
QMICTLType:         0022        QMICTL_GET_CLIENT_ID_REQ
Length:             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:      06
QMICTLType:         0022        QMICTL_GET_CLIENT_ID_REQ
Length:             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:      07
QMICTLType:         0022        QMICTL_GET_CLIENT_ID_REQ
Length:             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:    0001
Type:               0023        QMIDMS_GET_DEVICE_REV_ID_REQ
Length:             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:    0002
Type:               0020        QMIWDS_ADMIN_SET_DATA_FORMAT_REQ
Length:             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:    0003
Type:               002f        QMIUIM_GET_CARD_STATUS_REQ
Length:             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:    0004
Type:               002b        QMIWDS_GET_PROFILE_SETTINGS_REQ
Length:             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:    0005
Type:               004d        QMINAS_GET_SYS_INFO_REQ
Length:             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:    0006
Type:               0022        QMIWDS_GET_PKT_SRVC_STATUS_REQ
Length:             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 password
echo "quectel-pppd options in effect:"
QL_DEVNAME=/dev/ttyUSB3
QL_APN=3gnet
QL_USER=user
QL_PASSWORD=passwd
if [ $# -ge 1 ]; then
	QL_DEVNAME=$1	
	echo "devname   $QL_DEVNAME    # (from command line)"
else
	echo "devname   $QL_DEVNAME    # (default)"
fi
if [ $# -ge 2 ]; then
	QL_APN=$2	
	echo "apn       $QL_APN    # (from command line)"
else
	echo "apn       $QL_APN    # (default)"
fi
if [ $# -ge 3 ]; then
	QL_USER=$3	
	echo "user      $QL_USER   # (from command line)"
else
	echo "user      $QL_USER   # (default)"
fi
if [ $# -ge 4 ]; then
	QL_PASSWORD=$4	
	echo "password  $QL_PASSWORD   # (from command line)"
else
	echo "password  $QL_PASSWORD   # (default)"
fi

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\",\"$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 modemn" "" +++ "" +++ "" +++ SAY "nGood bayn"' 
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/ttyUSB2
quectel-pppd options in effect:
devname   /dev/ttyUSB2    # (from command line)
apn       3gnet    # (default)
user      user   # (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 seconds
send (AT^M)
expect (OK)
AT^M^M
OK
 -- got it

send (ATE0^M)
expect (OK)
^M
ATE0^M^M
OK
 -- got it

send (ATI;+CSUB;+CSQ;+CPIN?;+COPS?;+CGREG?;&D2^M)
expect (OK)
^M
^M
Quectel^M
EC20F^M
Revision: EC20CEHDLGR06A05M1G^M
^M
SubEdition: V03^M
^M
+CSQ: 31,99^M
^M
+CPIN: READY^M
^M
+COPS: 0,0,"CHN-UNICOM",7^M
^M
+CGREG: 0,1^M
^M
OK
 -- got it

send (AT+CGDCONT=1,"IP","3gnet",,0,0^M)
expect (OK)
^M
^M
OK
 -- got it

send (ATD*99#^M)
expect (CONNECT)
^M
^M
CONNECT
 -- got it

Script ''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 = 0x0
Serial connection established.
using channel 1
Using interface ppp0
Connect: ppp0 <--> /dev/ttyUSB2
sent [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 succeeded
CHAP authentication succeeded
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=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 10.64.64.64
local  IP address 10.18.14.216
remote IP address 10.64.64.64
primary   DNS address 221.6.4.66
secondary DNS address 58.240.57.33
Script /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 www.baidu.com
PING www.a.shifen.com (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 ms
64 bytes from 112.80.248.75 (112.80.248.75): icmp_seq=2 ttl=56 time=19.5 ms
^C
--- www.a.shifen.com ping statistics ---
2 packets transmitted, 2 received, 0% packet loss, time 1004ms
rtt 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。

最后

以上就是背后西牛为你收集整理的移植移远4G模块EC20过程记录2-QMI+PPP拨号上网1、背景2、移植QMI_WWAN驱动3、ppp拨号最后的全部内容，希望文章能够帮你解决移植移远4G模块EC20过程记录2-QMI+PPP拨号上网1、背景2、移植QMI_WWAN驱动3、ppp拨号最后所遇到的程序开发问题。

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