Recently I grabbed my trusted old Avnet / Digilent ZedBoard to test how well the current Xilinx tools work with this now a decade old platform. However, I was facing a weird issue: The serial output by the Zynq PS was only received via USB on my computer when I was sending characters via UART from my computer to the PS as well. As soon as there was a pause in communication, any further serial output by the PS was silently dropped.

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