How to compile Linux kernel and drivers?

Linux is an open source operating system that can run on a variety of embedded devices, such as smartphones, tablets, routers, etc. In order to adapt Linux to different hardware platforms, we need to compile the Linux kernel and drivers to control and manage the hardware. This article will introduce how to compile the Linux kernel and drivers, including how to configure kernel options, how to compile kernel modules and kernel images, and how to load and unload driver modules.

There are two methods for driver compilation:

\1. Compile into the kernel

\2. Compile into independent module

Establishment method:

1) Add your own driver directory to the driver directory of the Linux source tree, for example: now add a network device driver

    mkdir linux_tree/drivers/net/poker_driver -p

    cd linux_tree/drivers/net/poker_driver

2) Write driver source code

   vi poker_drv_part1.c

    vi poker_drv_part2.c

    vi poker_drv_part3.c

3) Write the source code directory Kconfig

vi Kconfig

      config POKER_DRV
      tristate "poker_driver support"
      default n
      ---help---
      If you say Y here, the kernel will support poker_driver.
      If you say M here, the kernel not support poker_driver, must 
perform "insmod poker_driver.ko".
      If you say N here, the kernel not support poker_driver.

4) Write source code directory Makefile

 vi Makefile

      obj-$(CONFIG_POKER_DRV) += poker_drv.o
      poker_drv-objs += poker_drv_part1.o poker_drv_part2.o poker_drv_part3.o

5) Modify superior Kconfig

vi linux_tree/drivers/net/Kconfig

      source "drivers/net/poker_driver/Kconfig"

6) Modify the superior Makefile

 vi linux_tree/drivers/net/Makefile

      obj-$(CONFIG_POKER_DRV) += poker_driver/

7) Configure the kernel

   make menuconfig

      Device Drivers  --->

         [*] Network device support  ---> 

          poker_driver support

\1. Compile into the kernel:

  poker_driver support

  linux_tree# make uImage

\2. Compile into independent module

  poker_driver support 

  linux_tree# make modules

Brackets problem:

[] Optional * Empty

Optional * M empty

Through the introduction of this article, we have learned about the compilation method of the Linux kernel and driver, as well as related tools and files. We can customize our own Linux system according to our own needs to adapt to different embedded devices. Compilation of Linux kernel and drivers is a basic and important skill. I hope this article can help you.

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