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Btw, compile things with -O3 can increase performance noticabally. |
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On Digilent boards, the onboard FT2232-based JTAG downloader seems to have external tri-state circuits controlled by the ADBUS7 pin of the FT2232, thus a pullup of the pin during MPSSE initialization is required to get this work. Tested on Nexys 4 DDR and PYNQ-Z1. Also added high-speed option to use 30 MHz TCK clock, this is not bottleneck but I saw a slight speed increase, for boards with on-PCB JTAG traces 30 MHz is quite safe.
So for Digilent boards, use
./xvcd-ft2232h -fd.