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License: BSD 3-Clause "New" or "Revised" License
Various Notes and Tutorials
License: BSD 3-Clause "New" or "Revised" License
Hello! I'm glad to see more interesting experiments!
I saw you posted a link to Xilinx DMA PCIe Tutorial by Roy Messinger. in XDMA Communitcation. I read it. He implements XDMA with descriptor bypass, which is interesting but not became clear what exactly happens. He uses polling mode which is wasteful of CPU threads (energy).
Do you plan to test the descriptor bypass feature ? It seems supported by the driver w/o modification.
AFAIK it is convinent when the memory is not contiguous.
Also, I try to imagine how they do c2h double buffering in stream mode - there should be a buffer on the host and the user/driver should get notification/IRQ when a buffer is filled so to replace it with another while the DMA is writing into its current buffer.
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