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NZhan1
Occasional Contributor
Occasional ContributorArria10 DMA失败
使用10AX027和CPU调试PCIe时发现以下问题： 调试过程中软件驱动负责分配一块物理内存，然后把物理内存地址写入FPGA，FPGA从这个物理内存地址做DMA，读取内容。 在Xeon系列的硬件平台上的异常现象是： 当驱动分配的物理内存在4G以上时，FPGA做DMA是可以的，分配到4G以下时，FPGA发送tlp的读请求后，始终得不到响应，DMA失败。 做了以下尝试： 将FPGA及...
SengKok_L_Intel
Regular Contributor
Regular ContributorHi,
As per what I understand here, this is using a custom driver to run the DMA test, where if the address allocation from the host is less than 4G, the test will fail.
Do you test the an829 design before?
https://www.intel.com/content/dam/www/programmable/us/en/pdfs/literature/an/an829.pdf
What is the "address width of accessible PCIe memory space" setting in the design?
Regards -SK
NZhan1HI SK No, The DMA part is self-designed module. And use PCIE AVST Gen2x4 mode. But this DMA can work with other platform, like ATOM C2758 and Core I5. There is no such problem. Regards， Nicole
