Advanced users • RPi 5 serial port, does it detect a connection?

I have a cable that connects my RPi 5's dedicated serial port to a USB port that has a built in UART converter.
If I power up the pi with the cable connected, it all works great and I can get a Linux login prompt on my PC's terminal app.
But, if the cable is disconnected on power up, if I connect it after Linux has booted, I get no response from the pi.
Does the RPi 5 have some sort of voltage detection on the UART port, and if it sees nothing does it disable it?

Statistics: Posted by bitbasher — Sat Feb 24, 2024 4:49 am

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