# python3 nmigen_boards/nexys_video.py
/usr/local/lib/python3.7/dist-packages/fasm/parser/__init__.py:41: RuntimeWarning: Unable to import fast Antlr4 parser implementation.
  ImportError: cannot import name 'antlr_to_tuple' from 'fasm.parser' (/usr/local/lib/python3.7/dist-packages/fasm/parser/__init__.py)

  Falling back to the much slower pure Python textX based parser
  implementation.

  Getting the faster antlr parser can normally be done by installing the
  required dependencies and then reinstalling the fasm package with:
    pip uninstall
    pip install -v fasm

  """.format(e), RuntimeWarning)
XC3SPROG (c) 2004-2011 xc3sprog project $Rev: 774 $ OS: Linux
Free software: If you contribute nothing, expect nothing!
Feedback on success/failure/enhancement requests:
        http://sourceforge.net/mail/?group_id=170565
Check Sourceforge for updates:
        http://sourceforge.net/projects/xc3sprog/develop

Could not open FTDI device (using libftdi): device not found
Unable to access FTDI device with either libftdi or FTD2XX
Traceback (most recent call last):
  File "nmigen_boards/nexys_video.py", line 53, in <module>
    do_program=True)
  File "/home/markos/src/nmigen/nmigen/build/plat.py", line 103, in build
    self.toolchain_program(products, name, **(program_opts or {}))
  File "nmigen_boards/nexys_video.py", line 47, in toolchain_program
    subprocess.run([xc3sprog, "-c", "nexys4", bitstream_filename], check=True)
  File "/usr/lib/python3.7/subprocess.py", line 487, in run
    output=stdout, stderr=stderr)
subprocess.CalledProcessError: Command '['xc3sprog', '-c', 'nexys4', '/tmp/nmigen_sjssw2ha_top.bit']' returned non-zero exit status 1.