How to perform Linux kernel transplantation

The Linux kernel is an open source operating system kernel. Due to its openness and flexibility, it is widely used in various embedded devices and platforms. Linux kernel transplantation means porting the Linux kernel to different hardware platforms to meet specific needs. In this article, we will introduce in detail how to perform Linux kernel transplantation and provide specific code examples.

Part One: Preparation

Before carrying out the Linux kernel transplantation operation, we need to make some preparations, including:

1. Download the Linux kernel source code: First Download the required Linux kernel source code from the official website or Github.
2. Cross-compilation tool chain: According to the architecture of the target platform, select an appropriate cross-compilation tool chain for compilation. Common cross-compilation tool chains include gcc, glibc, etc.
3. Target hardware documentation: Understand the target hardware’s architecture, device drivers and other related information.

Part 2: Configuring the Kernel

Next, we need to configure the Linux kernel to adapt to the requirements of the target hardware. The specific steps are as follows:

1. Enter the root directory of the Linux kernel source code and execute the following command to configure:

make menuconfig

2. Configure interface, select configuration options suitable for the target hardware, including processor architecture, device drivers, file systems, etc.
3. Save the configuration and exit the configuration interface.

Part 3: Compile the kernel

After the configuration is completed, we need to use the cross-compilation tool chain to compile the kernel. The specific steps are as follows:

1. Execute the following command to compile:

make ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- -j4

here The ARCH parameter specifies the architecture for compilation, the CROSS_COMPILE parameter specifies the prefix of the cross-compilation tool chain, and -j4 indicates enabling 4 threads for compilation.

2. After compilation is completed, files such as arch/arm/boot/zImage and arch/arm/boot/dts/*.dtb will be generated.

Part 4: Burn the kernel to the target hardware

Finally, we need to burn the compiled kernel to the target hardware to start the Linux operating system. The specific steps are as follows:

1. Copy the generated zImage and dtb files to the root directory of the startup device (such as SD card).
2. Configure startup parameters according to the startup method of the target hardware.
3. Insert the SD card into the target hardware, start the device, and you will see the Linux kernel startup information.

Through the above four steps, we have completed the transplantation of the Linux kernel. It should be noted that in actual applications, various problems may be encountered and need to be debugged and optimized according to specific circumstances. I hope the above content will be helpful to you in your Linux kernel transplantation operation.

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