This article is an excellent piece from the Kanxue Forum. Author from Kanxue ForumID: abcz316 Linux is an open-source kernel system. I am also very fond of embedded Linux systems, especially its kernel source code, which is written in a style that I really appreciate. This driver was previously written during my spare time for … Read more
Stage One: Obtaining the Interrupt Number Each CPU has the ability to respond to interrupts. When a CPU responds to an interrupt, it follows the same process. This process is the interrupt service routine provided by the kernel. Upon entering the interrupt service routine, the CPU has automatically disabled interrupt responses on that CPU, as … Read more
Word Count:4500 Content Index:⭐⭐⭐⭐⭐ Concept of Linux Device Driver System calls are the interface between the operating system kernel and application programs, while device drivers serve as the interface between the operating system kernel and machine hardware. Device drivers abstract hardware details from application programs, allowing them to interact with hardware devices as if they … Read more
The Linux kernel source code contains numerous files, and understanding the relationships between Makefile, Kconfig, and .config is crucial for navigating the kernel compilation system. Issues arise when trying to compile and modify the kernel, integrate your own drivers, or configure the kernel. All of these problems relate to Makefile, Kconfig, and .config. Below, I … Read more
Recently, I have been learning about the configuration, compilation, and Makefile for the Linux kernel. Today, I would like to summarize my learning results and share them with everyone. 1. Unpacking and Patching First, you need to unpack the Linux kernel you obtained. Here I am using version linux.2.22.6. In the Linux command line, you … Read more
When compiling the Linux kernel, we often execute some commands in the top-level directory of the Linux kernel. Taking RK3288 as an example, commands include: make firefly-rk3288-linux_defconfig, make menuconfig, make firefly-rk3288.img, make zImage, etc. Without delving into the specific meanings yet, I would like to raise a few questions. (1) The Linux kernel is so … Read more
Source: Baiwen Technology ❞The Linux kernel source code files are numerous, and it’s hard to understand the relationship between Makefile, Kconfig, and .config. Without understanding the kernel compilation system, it can be difficult to compile and modify the kernel, integrate your own drivers, or configure the kernel. These issues are all related to Makefile, Kconfig, … Read more
Overview This article introduces the development process and methods of device drivers under the platform framework, mainly including the development of device trees, drivers, and applications. Taking the random number driver as an example, it implements the process of the application calling the library function, entering the kernel through a system call, and finally executing … Read more
1. Introduction In the Linux device driver model, a bus is an abstract concept, a special type of device. In the implementation of the device model, the kernel specifies that each device in the system must be connected to a bus, which can be an internal Bus, a virtual Bus, or a Platform bus. The … Read more
Click the blue text above to follow me and read beautiful articles. The Linux operating system’s kernel manages various hardware devices in the system, including buses, devices, and drivers. This article will introduce the basic concepts of buses, devices, and drivers in the Linux system, as well as their relationships. By combining relevant /sys directory … Read more