作者：华清远见嵌入式学院。《Linux设备驱动开发详解》（08&09年度畅销榜TOP50）第1章、设备驱动概述。本章将带您走进Linux设备驱动的精彩世界。1.1节讲解了设备驱动的概念和作用。1.2节和1.3节分别讲述无操作系统和有操作系统情况下设备驱动的设计方法，通过分析讲解设备驱动与硬件和操作系统的关系。1.4节对Linux操作系统的设备驱动进行了概要性的介绍，讲解设备驱动与系统软硬件的关系，分析了Linux设备驱动的重点难点和学习方法。本章的最后给出了一个设备驱动的“Hello World”实例，即最简单的LED驱动在无操作系统情况下和Linux操作系统下的实现。-Author: HuaQing vision embedded institute. The Linux device driver development "(08 and 09 sep TOP50) annual list of best-selling chapter 1, device drivers overview. This chapter will take you into Linux device driver s wonderful world. Section 1.1 the device driver explained the concept and function. Section 1.2 and 1.3 respectively about operating system and have no operating system device driver design methods, through the analysis and explanation device driver hardware and operating system of the relationship. Section 1.4 of the operating system for Linux device driver for a general introduction, the explanation of the system hardware and software device drivers and the relationship between the Linux device drivers, analysis the difficult and study method. This chapter is given a device driver "Hello World" example, the most simple LED in operating system without driving situations and Linux operating systems