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2.0.0 - 2020-07-30
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Added
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- hdl: new testbench to test the DMA feature (read/write to DDR memory) in the
       new golden.
- sw: basic Python module to handle DMA and FPGA programming
- sw: user-space DMA interface in debugfs (read/write)
- tst: add integration tests for DMA transfers

Changed
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- hdl: Switch to 125MHz (from 62.5MHz before) clock for DMA transfers.
- hdl: Cleanup of top-levels, addition of DMA to the golden.

Fixed
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- hdl: DMA misalignment issue due to loss of 32-bit words, caused in turn by
       inadequate flow control.
- hdl: typo in synthesis constraints.