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Gizmotoy's avatar
Gizmotoy
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7 years ago

Intel AN829 PCIe DMA example failing to create /proc/devices entry

I'm working on bringing up AN829, the Altera DMA example, on a Cyclone 10 GX Development Kit. The FPGA is loaded and shows up on the PCIe bus. 05:00.0 Non-VGA unclassified device: Altera Corporatio...
WCarb1's avatar
WCarb1
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6 years ago

Hi,

Were you able to solve this issue? I have been trying to reduce the required memory allocation of BAR2 to less than 512MB (working with embedded devices ) in the reference design with no results. The Cyclone 10 GX Development Kit appears with lspci -vv but memory shows as <unassigned> for each block.

Gizmotoy's avatar
Gizmotoy
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6 years ago

I was able to get it working, but it was by switching to a machine with a larger PCIe address space. I kept getting <unassigned> for the memory space when I was on the other computer. It's not a great solution, but it worked.

  • WCarb1's avatar
    WCarb1
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    6 years ago

    Yes, in machines with larger PCI address memory space I had no problems. In fact, the issue was in one particular embedded device with limited memory space. However, I managed to solve it modifying the IP core from system designer to have a smaller PCIe memory size and changing the base addresses. Also the driver kernel from the linux side required some tuning for these new memory chunks. Thank you for all your help!