[嵌入式]jetson tx2平台调试EC20 4G模块

1.拿到手先确认模块，卡没有问题（我自己被有问题的卡坑了4天）
2.关于内核源码修改，编译全部参考正点原子的嵌入式驱动开发教程V1.5，唯一区别就是
这里我是把GobiNet编译为.ko文件，也尝试过编译到内核，但是有问题，遂放弃
3.重点是以下几点
3.1 下载busybox源码 并把 simple.script 移动到 /usr/share/udhcpc/目录下，重命名为default.script,（PS：如果没有这一步可以直接试试加载GobiNet.ko，执行quectel拨号软件，查看日志就知道这个路径了）
3.2 加载GobiNet.ko

root@gmy-desktop:/home/my/Desktop# insmod GobiNet.ko 

3.3 执行quectel拨号软件

root@my-desktop:/home/my/Desktop# ./quectel-CM 
[08-07_16:25:18:748] WCDMA&LTE_QConnectManager_Linux&Android_V1.1.34
[08-07_16:25:18:749] ./quectel-CM profile[1] = (null)/(null)/(null)/0, pincode = (null)
[08-07_16:25:18:750] Find /sys/bus/usb/devices/1-2.1 idVendor=2c7c idProduct=0125
[08-07_16:25:18:751] Find /sys/bus/usb/devices/1-2.1:1.4/net/eth1
[08-07_16:25:18:751] Find usbnet_adapter = eth1
[08-07_16:25:18:751] Find /sys/bus/usb/devices/1-2.1:1.4/GobiQMI/qcqmi1
[08-07_16:25:18:751] Find qmichannel = /dev/qcqmi1
[08-07_16:25:18:833] Get clientWDS = 7
[08-07_16:25:18:865] Get clientDMS = 8
[08-07_16:25:18:897] Get clientNAS = 9
[08-07_16:25:18:929] Get clientUIM = 10
[08-07_16:25:18:961] Get clientWDA = 11
[08-07_16:25:18:993] requestBaseBandVersion EC20CEFHLGR06A01M1G_OCPU_ZJ_BETA0620
[08-07_16:25:19:089] requestGetSIMStatus SIMStatus: SIM_READY
[08-07_16:25:19:121] requestGetProfile[1] ctnet///0
[08-07_16:25:19:153] requestRegistrationState2 MCC: 460, MNC: 1, PS: Attached, DataCap: LTE
[08-07_16:25:19:185] requestQueryDataCall IPv4ConnectionStatus: DISCONNECTED
[08-07_16:25:19:249] requestRegistrationState2 MCC: 460, MNC: 1, PS: Attached, DataCap: LTE
[08-07_16:25:19:313] requestSetupDataCall WdsConnectionIPv4Handle: 0x86af9b00
[08-07_16:25:19:409] requestQueryDataCall IPv4ConnectionStatus: CONNECTED
[08-07_16:25:19:440] ifconfig eth1 up
[08-07_16:25:19:452] busybox udhcpc -f -n -q -t 5 -i eth1
udhcpc: started, v1.27.2
udhcpc: sending discover
udhcpc: sending select for 10.58.210.137
udhcpc: lease of 10.58.210.137 obtained, lease time 7200

不知道为什么一直卡在这里(把这个程序放在后台执行比较好)，但是IP可以分配成功，不影响下一步，可以看看ifconfig就知道了。如果不行就重启，从头开始操作

3.4修改nameserver的地址为114.114.114.114,不然就ping不通了www.baidu.com,如果此时直接ping百度IP是可以的

my@my-desktop:~$ sudo vim /etc/resolv.conf 
[sudo] password for my: 
my@my-desktop:~$ cat /etc/resolv.conf 
# Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(8)
#     DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN
# 127.0.0.53 is the systemd-resolved stub resolver.
# run "systemd-resolve --status" to see details about the actual nameservers.

#nameserver 127.0.0.53
nameserver 114.114.114.114

移动卡可以不用改成114，可以直接ping通，联通卡要改
3.6 大功告成

my@my-desktop:~$ ping www.baidu.com
PING www.a.shifen.com (112.80.248.76) 56(84) bytes of data.
64 bytes from 112.80.248.76 (112.80.248.76): icmp_seq=1 ttl=51 time=42.1 ms
64 bytes from 112.80.248.76 (112.80.248.76): icmp_seq=2 ttl=51 time=35.7 ms
64 bytes from 112.80.248.76 (112.80.248.76): icmp_seq=3 ttl=51 time=43.1 ms
64 bytes from 112.80.248.76 (112.80.248.76): icmp_seq=4 ttl=51 time=34.1 ms
64 bytes from 112.80.248.76 (112.80.248.76): icmp_seq=7 ttl=51 time=54.9 ms
64 bytes from 112.80.248.76 (112.80.248.76): icmp_seq=8 ttl=51 time=34.4 ms
64 bytes from 112.80.248.76 (112.80.248.76): icmp_seq=9 ttl=51 time=36.2 ms
64 bytes from 112.80.248.76 (112.80.248.76): icmp_seq=11 ttl=51 time=44.1 ms

3.7 如何把以上步骤设置为开机自启动脚本？

3.8参考资料