基于PXA3xx处理器的NAND闪存DMA方案

摘要

According to the characteristics of PXA3xx processor, a solution of DMA controller system architecture was put forward and the low level NAND flash Direct Memory Access (DMA) driver under Linux was realized. Test method was designed in JFFS2 file system layer for data read. Test results show that DMA could improve the performance of NAND flash read efficiently, and relieve NAND flash performance bottleneck.%针对PXA3xx处理器的特性,提出一种DMA控制器系统架构方案,并在此架构上结合嵌入式Linux操作系统实现NAND Flash的底层驱动程序.重点设计了基于JFFS2文件系统的读操作测试方案,测试结果表明,DMA方式能够有效降低CPU处理负载,缓解NAND Flash性能瓶颈.