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On Xilinx you can edit the .ucf file and add the "PULLDOWN" constraint 
but the I/O pins will float during powerup/configuration.

For 50 pin cards, it's much easier to just reverse the pullup resistors
and the GPIO will be guaranteed to be low at all times (and with a known
pulldown resistance)
 

low-blip wrote:

Did you figure it out? I want to use a Rust library in my VCP, but I only know how to install it as a package in a virtual environment.
 

Oh gosh, I can't remember! It's been so long since I worked on that project! I’m definitely using a venv, but I'm not sure I was able to switch the Python interpreter.