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上位机通过怎么DMA方式读取6455PCI映射空间的数据



各位好,请问下,上位机通过windriver开发驱动,dsp将数据通过EDMA方式将数据写入BAR5空间,上位机怎么配置DSP的PCI中相关的寄存器,来设置DMA源地址和数据传输大小,以及启动DMA,使用DMA的方式将数据快速从映射空间搬到本地计算机的内存,分别要设置哪些寄存器?谢谢!