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Can you please explain how exactly this part of the code works
This is a screenshot from [link]

I am not able to get how exactly out_buffer is calculated.
There must be some calculations done to calculate the out buffer. So how those are done here. Here in this code, in the in_buffer we store the X_data and we change the bits of some registers and get output in out_buffer.
From what I have read till now in the documentation. I think it is something done while making the overlay.
So if that is the case then I am not able to find tutorials for making a custom overlay for my Machine Learning Model.

Should we only use pynq z2 board or we can even include rasberry pi ,arduino for the Xilinx Innovation Challenge conducted by Kshitij 2019

I am using vivado hlx webpack version 2018.2 on ubuntu and I would like to add pynq-z2 boardfile to it.
I have tried copying the boardfile to the location " /opt/Xilinx/Vivado/2018.2/data/boards/board_files/ "
but couldn't find the board while creating a new project. Please help me with this.

Also, I would like to know if Vivado supports python's myhdl library or am I restricted to use C++ for hls?.

I am working with a RFID SYSTEM using RC522 sensor but I have checked in the manual of PYNQ that there is no function related to RC522 available to be implemented in JUPYTER platform. A function relating to it would be required for the interaction of PYNQ-Z2 board with RC522 SENSOR . How do I implement this thing in JUPYTER ?