一、硬件信息
4G模块：龙尚U9300C
5G模块：龙尚EX510
CPU（LS1023AX）
4G/5G模块的硬件接口是通过两个pci转usb接口的
二、根据龙尚的指导文档添加相应的驱动模块，在option.c里面添加相应的pid和vid
1、模块识别
一开始插上5G模块的时候，模块不识别。提示
[ 12.615593] usb usb2-port1: Cannot enable. Maybe the USB cable is bad?后面修改硬件让5G模块上电复位以后能识别了。
插入4G和5G模块，启动设备以后，可以通过lsusb看到识别模块的pid和vid
2df3和5b01就是对应的5G模块EX510
root@localhost:~# lsusb
Bus 006 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 005 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 002: ID 2df3:5b01
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub这里5G模块接到usb2.0下面去了，如果想让它接到usb3.0上面去的话，不知道是要通过硬件问题还是软件文件？
对比了nxp的参考板，usb接口插上去，是识别usb3.0的
2、ttyUSB*调试
通过dmesg | grep tty找到5G模块生成的ttyUSB
[ 4.604025] usb 1-1: GSM modem (1-port) converter now attached to ttyUSB0
[ 4.620487] usb 1-1: GSM modem (1-port) converter now attached to ttyUSB1
[ 4.636953] usb 1-1: GSM modem (1-port) converter now attached to ttyUSB2
[ 4.657756] usb 1-1: GSM modem (1-port) converter now attached to ttyUSB3然后就可以调试ttyUSB了，对应5G模块的at接口，龙尚文档里面都有，不知道的话，一个一个试一下也能试出来。
这里是ttyUSB0。
三、pci模块验证
买了一个mini pcie转千兆网口配件（瑞联的）千兆网卡是82574L
插上去以后就lspci就能直接看到新接的设备了。
root@localhost:~# lspci
0000:00:00.0 PCI bridge: Freescale Semiconductor Inc Device 8088 (rev 11)
0000:01:00.0 Ethernet controller: Intel Corporation 82574L Gigabit Network Connection
0001:00:00.0 PCI bridge: Freescale Semiconductor Inc Device 8088 (rev 11)内核模块添加网卡驱动（CONFIG_IGB=y）
| Symbol: IGB [=m] |
| Type : tristate |
| Prompt: Intel(R) 82575/82576 PCI-Express Gigabit Ethernet support |
| Location: |
| -> Device Drivers |
| -> Network device support (NETDEVICES [=y]) |
| -> Ethernet driver support (ETHERNET [=y]) |
| (1) -> Intel devices (NET_VENDOR_INTEL [=y]) |
| Defined at drivers/net/ethernet/intel/Kconfig:83 |
| Depends on: NETDEVICES [=y] && ETHERNET [=y] && NET_VENDOR_INTEL [=y] && PCI [=y] |
| Selects: I2C [=y] && I2C_ALGOBIT [=m] |
| Implies: PTP_1588_CLOCK [=m]
驱动添加以后，ifconfig -a就可以看到多出一个接口来了
enp1s0: flags=4098 mtu 1500
ether 6c:b3:11:54:07:78 txqueuelen 1000 (Ethernet)
RX packets 0 bytes 0 (0.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 0 bytes 0 (0.0 B)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
device interrupt 79 memory 0x48400c0000-48400e0000
