Ubuntu 16.04 Linux driver compiling step 1, ubuntu16.04

Ubuntu 16.04 Linux driver compiling step 1, ubuntu16.04

 

Build the source code Environment

 

• • Install source code

> Sudo apt-cache search linux-source

Linux-source-Linux kernel source with Ubuntu patches

Linux-source-4.4.0-Linux kernel source for version 4.4.0 with Ubuntu patches

Because the difference is slightly different, choose linux-source-4.4.0. Depends on the version number you display.

> Sudo apt-get install linux-source-4.4.0

After the installation is complete, two new files, one for the linux-source-4.4.0 folder and the other for the linux-source-4.4.0.tar.bz2, appear under the/usr/src/directory.

> Tar jxvf linux-source-4.4.0.tar.bz2-C/home/yourdir/Kernel

Decompress the package to your folder or to the current directory.

Perform Kernel configuration in the extracted linux-source-4.4.0 directory

> Sudo make oldconfig// Configure the kernel

> Sudo make// It takes a long time to compile the kernel. h No such file or directory indicates that libssl-dev needs to be installed to execute sudo apt-get install libssl-dev.

> Sudo make modules// Compile the module

> Sudo make modules_install// Installation Module

The first. c file and Makefile file

• Create a folder in your working directory and create the hello. c and Makefile files.
• Makefile can be directly created using vim Makefile. Note that M is capitalized.

Hello. c code

 1 #include <linux/init.h> 2 #include <linux/module.h> 3 MODULE_LICENSE("Dual BSD/GPL"); 4 static int hello_init(void) 5 { 6     printk(KERN_ALERT "Hello, world\n"); 7     return 0; 8 } 9 static void hello_exit(void)10 {11     printk(KERN_ALERT "Goodbye, cruel world\n");12 }13 14 module_init(hello_init);15 module_exit(hello_exit);

Makefile. // Note the space and Tab

Obj-m: = hello. ohellomodule-objs: = module # You can change "hello" to your name: KERNELDIR: =/lib/modules/$ (shell uname-r)/buildPWD: = $ (shell pwd) default: $ (MAKE)-C $ (KERNELDIR) M = $ (PWD) modules

Save and run> Sudo make

To generate the hello. ko file. You can use this file to load it to the kernel.

Load command> sudo insmod./hello. ko

After loading, you can use> lsmod // to view the currently installed driver module.

> Cat/var/log/syslog, you can directly view the output hello and Goodbye // or use> dmesg | the tail command is simpler.

Uninstall command> sudo rmmod./hello. ko

 

The first time I configured the environment and wrote Makefile, I encountered many pitfalls. For more information about the driver, please refer to related books and tutorials on Linxu driver development.

For the reason why the hello. c and Makefile files in this article are written like this, I believe you can understand the relevant information.