Linux系统中PCI设备DMA数据传输的实现

将传统数据传输方式与存储器直接存取（direct memory access，DMA）数据传输方式进行了对比分析，结合外设组件互连标准（peripheral component interconnection，PCI）总线的特点，以嵌入式Linux系统为平台，重点分析了PCI设备驱动程序中DMA数据传输实现机制，给出了传输实现的基本结构及单元组成，并以实际例子介绍了基于PCI9080芯片的DMA传输实现。经测试验证，该方法可满足实际的传输要求。

Implementation for DMA data transmission of PCI device in Linux system

For direct access to the traditional mode of data transfer and storage (direct memory access,DMA), we conducted a comparative analysis of data transmission. We focused on the analysis of the PCI DMA data transfer mechanism in the device driver by combining the peripheral component interconnect(PCI) standard characteristics of the bus, with embedded Linux system as the platform. The transmission of basic structures and units is pointed out, and the example is given to describe PCI9080 chip based DMA transfer implementation. Tests show that it can meet the actual transfer requirements.