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First, Mknod: Set the device codeIn Linux, all devices are represented by files, and the files are judged by major and minor values.Major is the main device code, minor is the device code (need to query), the example is as follows:/dev/hda---------major:3------minor:0~63/DEV/HDB----------major:3------minor:64~127/DEV/SDA----------major:8------minor:0~15...Command

Main device number and secondary device number Those names are called special files, device files, or nodes that are simply called file system trees, and they are usually located in the/dev directory Typically, the main device number identifies the driver that corresponds to the

Original URL: http://www.cnblogs.com/biglucky/p/4059582.html The three main members of Linux I²C subsystem I2c_adapter, I2c_driver and I2c_client are briefly described in (a). The relationship of the three is also described in the previous section. There should be a preliminary understanding of the Linux I²c subsystem. The following further analysis of their relationship to the code layer, I think the better the understanding of their relationship, the more conducive to the development

Device content As we all know, the device context is a Windows data structure that contains information about the drawing properties of a device, such as a display or printer. All painting calls are performed through the device context object, including the paint brush, bitmap, and painting brush. The

(void *start, size_t length);3. Virtual Memory Area:The virtual memory area is a homogeneous interval in the virtual address space of the process, that is, a contiguous address range with the same characteristics. The memory image of a process consists of the following parts: program code, data, BSS and stack areas, and memory-mapped regions.The Linux kernel uses the VM_AREA_STRUCT structure to describe the virtual memory area. Its main members:unsigned long vm_start; /* Our start address withi

In this walkthrough, you will use Visual Basic or Visual C #Generate a simple windows form applicationProgram,Then run the application on the Pocket PC simulation program.This walkthrough demonstrates the main differences between desktop programming and device programming,That is, you must specify the target device.During this drill, the device is a built-in simulation program of the Pocket PC 2003.--------

functions when interacting with the memory management subsystem.3. File systemEach Unix object can be viewed as a file.The kernel constructs a structured file system on hardware that has no structure.Linux supports a variety of file system types, essentially different ways of organizing data on physical media.4. Device ControlAlmost every system operation will eventually be mapped to a physical device. In

0. Preface　　Graduate life all are on the right track, I also started a new study, because really do not want to make storage, so decided to study with the elder brother device driver, read the book two weeks, finally a little clue, began to record it!1. Preparatory workA) View the kernel versionUname-rb) Install kernel source tree (http://www.cnblogs.com/Jezze/archive/2011/12/23/2299871.html)　　Download the source code in www.linux.org, here is the. xz

Devices in the system that can randomly (and do not need to sequentially) access fixed-size data slices (chunks) are called block devices, which are called blocks. The most common block devices are hard disks, and in addition, there are many other block devices, such as floppy drives, CD-ROM drives, flash memory, and so on. Note that they are all used in a way that installs the file system-this is also the general way to access the block device.Another basic

Device and platform device have different registration methods. There are two steps for device registration, and two steps for platform device registration. The first steps are the same and both are initialize devices, However, the second step is different. device directly c

Device object (device_object) --------------- main Member I. device object (device_object) Kd> dt _ device_objectNtdll! _ Device_object+ 0x000 type: int2b+ 0x002 size: uint2b+ 0x004 referencecount: int4b+ 0x008 driverobject: ptr32 _ driver_object; driver object of the device+ 0x00c nextdevice: ptr32 _ device_object; points to the next