【作者】 徐雪松；

【导师】 章兢；

【作者基本信息】 湖南大学 ， 控制理论与控制工程， 2004， 硕士

【摘要】 在以计算机技术、通讯技术相结合的信息时代的快速发展以及互联网广泛应用的形势下，3C(Computer、Communication、Consumer)合一的趋势已经形成，其结果必然就是将计算机工业的中心从计算产品转移到信息产品，从而出现信息电器的概念。嵌入式系统及嵌入式操作系统也获得突飞猛进的发展。 论文首先综述了嵌入式系统的组成结构及性能特点，介绍了嵌入式技术的国内外研发现状。在综合比较现有各种嵌入式操作系统的基础上，分析了使用Linux构造嵌入式系统的优点和缺陷。并介绍了运用桌面Linux实现小型化的嵌入式Linux的相关方法和关键技术。 嵌入式文件系统是嵌入式操作系统的一个重要组成部分，随着嵌入式系统硬件设备性能的提高和价格的不断降低以及嵌入式系统应用范围的不断扩大，嵌入式存储设计的重要性显得更加突出。对嵌入式系统来说，非正常断电或其他错误会导致文件系统不一致性，带来文件系统的破坏和信息的丢失。因此，本文在研究嵌入式Linux文件系统的优化问题基础上，分析了Linux环境下MTD设备驱动程序设计的方法和技巧，采用了Linux基于Flash的JFFS文件系统。最后，根据嵌入式存储设备Flash的特殊属性，本文着重阐述了在特殊存储设备DiskOnChip上JFFS文件改造及linux的实现，主要讨论了DiskOnChip驱动对JFFS支持问题的解决与存储方案的设计。 文中最终实现的嵌入式Linux系统、所有的设备驱动程序以及全部的应用程序己经在16M的电子盘中稳定运行，并成功应用于易新科技有限公司的神机系列网络信息处理机中。文中所介绍的方法对嵌入式系统研究及嵌入式Linux的应用具有一定价值。更多还原

【Abstract】 With the development of Computer technology and Communication technology in Information times and the aboard application of Internet, it is clear that 3C (Computer, Communication and Consumer) will converge in the near future which will lead the focus of Computer Industry from the Compute product to information product. The embedded system and embeded OS has approached a remarkable development.This thesis, firstly, summarizes the structure and performance of the embedded system, then introduces the research of embedded technology at domestic and international. On the base of synthetic comparing all kinds of Embedded Operating System exiting today, the paper analyses the excellence and limitation of using Linux to build Embedded System. In order to implement a simple embedded Linux running in embedded storage devices, the thesis presents correlative methods and key skills in details.In the embedded system, the filesystem is an important part of it. With the price of hardware goes down as well as the capability is higher and higher, the embedded filesystem becomes more improtant than any time before. For the embedded system, unexpected power-off and other mistakes often cause a corruption of the filesystem and lost of data. Therefore, based on the analysising the embedded filesystem, this paper probes into the method of designing MTD device driver under linux and adapted a new filesystem based on Flash. Finally, according to the speciality proportion of the Flash storage devices, the paper emphasizes the realizition of JFFS and the embedded linux on DiskOnChip, primarily discussed how the DiskOnChip drive supporting JFFS and the new project of storage.The Embedded Linux System, together with all the device driver and application software, which finally have been stably running in 16M Flash. ShengJi, which is a net information production developed by eThink Technology Co.LTD, has applied the embedded linux system. The methods reported here could be beneficial to the research on embedded system and the application in embedded Linux.更多还原