Ubuntu16.04 系统加载 Air720H 全网通4G模块上网
一、编译系统内核
对Linux内核驱动修改，让操作系统支持Air720
Air720模块Linux USB驱动
在Ubuntu16.04系统下，如何修改usb驱动支持合宙 Air720模块
Air720正常启动后，通过USB连接到linux设备上，驱动正常加载后会产生如下设备：
1.查看当前系统原码版本
$ apt-cache search linux-source
linux-source – Linux kernel source with Ubuntu patches
linux-source-5.3 – Linux kernel source for version 5.3 with Ubuntu patches
2.下载源码
$ sudo apt-get install linux-source-5.3
sudo apt-get install libncurses5-dev
sudo apt-get install bison
sudo apt-get install flex
sudo apt-get install libssl-dev
下载完成后，在/usr/src目录中，可以看到压缩包
$ ls
linux-headers-2.6.35-22 linux-source-5.3
linux-headers-2.6.35-22-generic linux-source-5.3.tar.bz2
3.编译
$ sudo tar -xjvf linux-source-5.3.tar.bz2
sudo make mrproper
sudo make clean
$ sudo make menuconfig
1.Add VID add PID
File: [KERNEL]/drivers/usb/serial/option.c
static const struct usb_device_id option_ids[] = {
//+add by airm2m for Air72x
{ USB_DEVICE(0x1286, 0x4e3d) },
//-add by airm2m for Air72x
{ USB_DEVICE(OPTION_VENDOR_ID, OPTION_PRODUCT_COLT) },
{ USB_DEVICE(OPTION_VENDOR_ID, OPTION_PRODUCT_RICOLA) },
{ USB_DEVICE(OPTION_VENDOR_ID, OPTION_PRODUCT_RICOLA_LIGHT) },
{ USB_DEVICE(OPTION_VENDOR_ID, OPTION_PRODUCT_RICOLA_QUAD) },
{ USB_DEVICE(OPTION_VENDOR_ID, OPTION_PRODUCT_RICOLA_QUAD_LIGHT) },
2. Add the Zero Packet Mechanism
⦁For linux Kernel Version newer than 2.6.34：
File: [KERNEL]/drivers/usb/serial/usb_wwan.c
static struct urb *usb_wwan_setup_urb(struct usb_serial_port *port,
int endpoint,
int dir, void *ctx, char *buf, int len,
void (*callback) (struct urb *))
{
struct usb_serial *serial = port->serial;
struct urb *urb;
urb = usb_alloc_urb(0, GFP_KERNEL); /* No ISO */
if (!urb)
return NULL;
usb_fill_bulk_urb(urb, serial->dev,
usb_sndbulkpipe(serial->dev, endpoint) | dir,
buf, len, callback, ctx);
//+add by airm2m for Air72x
if(dir == USB_DIR_OUT){
struct usb_device_descriptor *desc = &serial->dev->descriptor;
if(desc->idVendor == cpu_to_le16(0x1286) && desc->idProduct == cpu_to_le16(0x4e3d))
{
urb->transfer_flags |= URB_ZERO_PACKET;
}
}
//-add by airm2m for Air72x
return urb;
}
⦁For linux Kernel Version older than 2.6.35：
File: [KERNEL]/drivers/usb/serial/option.c
static struct urb *option_setup_urb(struct usb_serial *serial, int endpoint,
int dir, void *ctx, char *buf, int len,
void (*callback)(struct urb *))
{
……
/* Fill URB using supplied data. */
usb_fill_bulk_urb(urb, serial->dev,
usb_sndbulkpipe(serial->dev, endpoint) | dir,
buf, len, callback, ctx);
//+add by airm2m for Air72x
if(dir == USB_DIR_OUT)
{
struct usb_device_descriptor *desc = &serial->dev->descriptor;
if(desc->idVendor == cpu_to_le16(0x1286) && desc->idProduct == cpu_to_le16(0x4e3d))
{
urb->transfer_flags |= URB_ZERO_PACKET;
}
}
//-add by airm2m for Air72x
return urb;
}
3. Add Reset Resume
⦁For linux Kernel Version newer than 3.4：
File: [KERNEL]/drivers/usb/serial/option.c
static struct usb_serial_driver option_1port_device = {
.driver = {
.owner = THIS_MODULE,
.name = “option1”,
},
….
#ifdef CONFIG_PM
.suspend = usb_wwan_suspend,
.resume = usb_wwan_resume,
//+add by airm2m for Air720
.reset_resume = usb_wwan_resume,
//-add by airm2m for Air720
#endif
};
⦁For linux Kernel Version older than 3.5：
File: [kernel]/drivers/usb/serial/usb-serial.c
/* Driver structure we register with the USB core */
static struct usb_driver usb_serial_driver = {
.name =”usbserial”,
.probe =usb_serial_probe,
.disconnect =usb_serial_disconnect,
.suspend =usb_serial_suspend,
.resume =usb_serial_resume,
//+add by airm2m for Air72x
.reset_resume = usb_serial_resume,
//-add by airm2m for Air72x
.no_dynamic_id = 1,
};
4. Modify Kernel Configuration
Step 1：
cd <your kernel directory>
Step 2：
make menuconfig
Step 3：Enable CONFIG_USB_SERIAL_OPTION
[*] Device Drivers →
[*] USB Support →
[*] USB Serial Converter support →
[*] USB driver for GSM and CDMA modems
Step 4：Configure Kernel to Support PPP
[*] Device Drivers →
[*] Network device support →
[*] PPP (point-to-point protocol) support
5.编译内核
make -j4
sudo make modules_install
sudo make install
sudo mkinitramfs –o /boot/initrd.img-5.3.18
sudo update–initramfs –c –k 5.3.18
sudo update–grub
sudo shutdown –r now
uname –a
lsusb
Bus 001 Device 009: ID 1286:4e3d Marvell Semiconductor, Inc.
6.模块测试
将重新编译好的内核下载到开发板之后，待系统重新启动，如果是带RNDIS网卡的驱动，在/dev/目录下会出现如下设备节点：
Air720的AT端口是/dev/ttyUSB2，现在你可以使用UART端口工具如“minicom”或“busybox microcom”测试AT功能，结果如下：
- 让04 系统支持RNDIS网络
增加rndis设备驱动（配置内核）
对于较老版本或者嵌入式设备默认可能关闭了RNDIS驱动，我们以linux-3.13为例，描述如何打开linux自带的RNDIS驱动：
step 1:
-
- cd <your kernel directory>
step 2:
-
- make menuconfig
step 3: ENALBE USB_NET_RNDIS_HOST
make
将编译好的内核重新下载到设备
- 配置终端
（硬件环境：pi3B+）
双网卡基本情况如下:
Eth0网卡 ->负责内网: ip 192.168.24.26 netmask 255.255.255.0 gateway: 192.168.24.1
Eth1(rdnis)网卡 ->负责外网: ip 192.168.0.100 netmask 255.255.255.0 gateway:192.168.0.1
配置双网卡
=========================begin\|/================================
开始配置双网卡:
1.修改 /etc/network/interfaces文件,只能设置一个系统默认的网关.本人将eno2外网的网关设为默认网关,
这个文件中双网卡只能设置一个默认网关(本例为eth1外网),另外一个(内网eth0内网)需要通过命令添加.
auto lo
iface lo inet loopback
#local负责内网
auto eth0
iface eth0 inet static
address 192.168.24.26
netmask 255.255.255.0
#out net负责外网
auto eth1
iface eno2 inet static
address 192.168.0.100
netmask 255.255.255.0
gateway 192.168.0.1 #设置的默认网关为外网eth1
dns-nameservers 211.140.13.188 #根据需要配置(这里是移动4G )
up route add -net 192.168.24.0/24 gw 192.168.24.1 dev eth0 #通过手动命令设置eth0内网的网关//含义是 只要是192.168.24.0网段的包，都经过eth0网卡，发送给网关192.168.24.1， 24表示掩码是255.255.255.0//
# This file is generated from information provided by the datasource. Changes
# to it will not persist across an instance reboot. To disable cloud-init’s
# network configuration capabilities, write a file
# /etc/cloud/cloud.cfg.d/99-disable-network-config.cfg with the following:
# network: {config: disabled}
network:
ethernets:
eth0:
addresses: [192.168.24.28/24]
# dhcp4: false
# gateway4: 192.168.24.1
# nameservers:
# addresses: [60.191.244.5]
optional: true
eth1:
dhcp4: false
addresses: [192.168.0.100/24]
gateway4: 192.168.24.1
nameservers:
addresses: [60.191.244.5]
optional: true
version: 2
具体格式参照镜像系统网络配制文件
2.重启网卡服务,如不行则重启系统!
重启网卡服务命令:1. sudo service networking restart 或者 sudo /etc/init.d/networking restart
重启系统命令:1. sudo shutdown -r now 或者 sudo reboot
3.修改完毕．进行测试．命令行终端: