摘要
为了减小嵌入式系统的体积和价格,对嵌入式中两种主要的闪存:NOR Flash and NAND Flash进行了研究。由于NORFlash存在布线多、成本高、存储容量小、擦写速度慢等缺点,根据嵌入式系统可裁减可移植的特点,在对ARM处理器的启动方式进行分析和比较的基础上,裁掉NOR Flash芯片,仅用NAND Flash芯片引导和启动系统。并着重阐述了采用有效的存储结构提供可靠的坏块管理机制,采用多级引导方式,实现基于NAND Flash的引导。从而节省NOR Flash芯片,降低了成本。
In order to reduce the cost of an embedded system,has studied the two main flash memories： NOR Flash and NAND Flash. NOR Flash has some limitation： e.g. complex layout, high cost, small capacity and lower accessing speed etc, so try to overcome these problems. First,compare and analyze booting mode based on ARM CPU of embedded system, then try to cut the NOR Flash chip and just boot system from NAND Flash. Finally,propose a reliable mechanism of bad block management and a new technique of loading step by step for booting system from NAND Flash. Therefore can remove NOR Flash chip and save cost.
出处
《计算机技术与发展》
2008年第7期35-37,41,共4页
Computer Technology and Development
基金
广东省自然科学基金(06021484)
