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19章、Flash设备驱动。Flash在嵌入式系统中是必不可少的，它是BootLoader、Linux内核和文件系统的最佳载体。在Linux内核中，引入了MTD层为NOR Flash和NAND Flash设备提供统一的接口，从而使得Flash驱动的设计工作大为简化。19.1节讲解了Linux Flash驱动的结构，主要讲解了MTD系统的层次结构和接口。19.2节和19.3节分别讲解了NOR Flash和NAND Flash驱动的设计方法，给出了设计模板。19.4节和19.5节分别以S3C2410外围NOR Flash和NAND Flash为实例进一步讲解了NOR Flash和NAND Flash驱动的设计。19.6节讲解了如何在Flash上建立cramfs、jffs/jffs2及yaffs/yaffs2文件系统。-Author: HuaQing vision embedded institute. The Linux device driver development "(08 and 09 sep TOP50) annual list of best-selling chapter 19, Flash device drivers. Flash in embedded systems is necessary, that it is the BootLoader, Linux kernel file system and the best carrier. In the Linux kernel, introduce a MTD layer TTL NAND Flash for Flash and provide a unified interface equipment, thus make the Flash drive design work greatly simplified. Section 19.1 explained Linux Flash drive structure, main explained MTD system level structure and interface. Section 19.2 and 19.3 respectively explained TTL NAND Flash drive and Flash design method are given, and the design template. Section 19.4 and 19.5 respectively to S3C2410 TTL NAND Flash Flash and peripheral as an example to explain further TTL NAND Flash drive and Flash design. Section 19.6 explained how to establish cramfs, JFFS Flash on the original and yaffs/yaffs2/file system.