linux kernel driver tutorial

Ubuntu kernel compilation tutorial-compile the Linux4.5.0 Kernel Tutorial environment: Ubnuntu 64-bit (14.04 recommended) + Xshell The Linux ECs is very useful for compiling the kernel. This article describes the most basic

For details, refer to Redhat, kernel image file initrd. img loading driver-Linux general technology-Linux technology and application information. To load the Raid driver (LSI megeraid_sas.ko) in the Redhat6.0 kernel image file ini

Sleep a good sleep, very late, for a long time not so comfortable, today's task is not heavy, so the pressure is not big, oh, the weather is really cold, but the laboratory has air conditioning, I still like to stay here, there is a different feeling, after writing so many days, I do not understand the page gradually enlightened, And also made some friends, really very happy ah. Today will introduce you to add code to the kernel, take a look at it ~Fi

and LCD display (for display software, such as a video card), which is called FB (Frambuffer).(4) What is Framebuffer?To sum up, FB is the Linux kernel to the system inside all the hardware and software, such as display related to the collection of these parts, the overall virtual out of a device FB, this device has a feature, that is, the application layer can provide a unified interface, this interface i

Linux loopback NIC Driver Design, linux loopback NIC Driver Loop NIC Driver1. The difference between a back-to-loop network card and a common network card is that it is virtual rather than a physical network card. It is equivalent to concatenating the sending end and the receiving end of the common network card.2. in t

Access to the character device is performed through the device name in the file system. Those device names are simply nodes that are called file system trees, and they are typically located in the/dev directory. Device files for character device drivers can be identified by ' C ' in the first column of the ls-l command output. Block devices are also located in/dev, identified by the character ' B 'CRW-RW----1 root root 253, 0 2013-09-11 20:33 Usbmon0CRW-RW----1 root root 253, 1 2013-09-11 20:33

In the Linux device driver first: Introduction to the device driver briefly describes the character driver, this article briefly describes how to write a simple character device driver. This article draws on the source code in the LDD, realizes a hardware device-independent

try to read a kconfig file. OK, now that we have an understanding of these keywords, let's take a look at the formation of this menu list. After running make menuconfig, the system's configuration tool first analyzes the/arch/arch/kconfig corresponding to the architectureThe file (the Arch argument that appears here is at the end of this article). It actually refers to the second, another important role------introduction of Kbuild Makefile The Kconfig file helps the user complete the confi

Linux Device Driver Article 4: Driver debugging methods, linux Article 4 In the previous article, we probably talked about how to write a simple character device driver. We are not a god, but there will certainly be a problem when writing code. We need to continuously debug

buzzer in the kernel in/driver/char/buzzer/x210-buzzer.c. This driver has no job, or is compiled into the kernel, it depends on the directory in the makefile fileobj-$ (config_buzzer_driver) + = X210-BUZZER.OCONFIG_BUZZER_DRIVER macro is defined, whether this macro is defined depends on the Kconfig file in this direct

CentOS kernel Upgrade tutorial This article applies to CentOS 6.4 and CentOS 6.5, and is estimated to be applicable to other Linux distributions.1. Prepare for checking the kernel and version information [root@hostname ~]# uname -r2.6.32-220.el6.x86_64[root@hostname ~]# cat /etc/centos-release CentOS release 6.5 (Final

that is connected to the device file and is used to reflect the device type. The secondary device number is used by the driver to identify which device is operating and to distinguish between devices of the same type.In the Linux kernel, the device number is described by dev_t, as defined in 2.6.28:typedef u_long DEV_T;In a 32-bit machine is 4 bytes, the high 12

Linux Kernel module notes, Linux kernel module Topic: 1. basic embedded knowledge 2. linux Kernel Introduction 3. kernel compilation and installation (x86) 4. first Module 5. module rel

Run the command "Kernel driver not installed (rc =-1908)" after virtualora installs virtualbox. To solve this problem, run the command www.2cto.com/etc/init. d/vboxdrv setup install the Virtual Machine driver. Unfortunately, an error is returned when you execute this command. If no error is reported for relevant information found on the internet, three conditions

Programs running in the Linux kernel should always prevent competing states caused by concurrency. This will cause the data structure to be broken down and cause the kernel to crash in severe cases. Therefore, the kernel synchronization technology is very important to the driver