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I have reworked XDMA driver #4

@Prandr

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@Prandr

Hi @mwrnd
First of, thank you once again for the great job you do with the XDMA tutorials.
In the past months I have improved from having no idea in XDMA to competely reworking it :D. You could find it on my repo
Your tutorials are still applicable to it, but I enforce strict access. Therefore would be no longer possible to use pwrite for AXI-Stream interfaces. In, addition I added a possibility to submit transfer over ioctl. This is primarily to circumvent 2 GB limit for read/write operations on Linux.
Perhaps you would be interested to try it yourself and adjust/expand your tutorials?

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