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NZhan1's avatar
NZhan1
Icon for Occasional Contributor rankOccasional Contributor
6 years ago

Arria10 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's avatar
SengKok_L_Intel
Icon for Regular Contributor rankRegular Contributor
6 years ago

Yes, this is one of the debug item. Another thing is to capture the signal tap to confirm whether the PCIe HIP AVST interface did receive the completion TLP, this can help to understand whether the packet is missing.

Regards -SK

  • NZhan1's avatar
    NZhan1
    Icon for Occasional Contributor rankOccasional Contributor
    6 years ago
    Hi SK , Thanks! We will try it. Regards， Nicole