I have a circuit board that is connected to a Raspberry through GPIO. When I was exchanging the Rasp for the Jetson Nano, I failed to notice that PIN27 (I2C-SDA) is not a GPIO in the Jetson Nano. That pin was being fed a 3.3V signal constantly by the circuit board and when booting up the jetson nano, it failed to do so.
Disconnecting the PIN solved the issue.
This is not a problem as we can simply change PINs but given that the fact that I2C is pulled up to 3.3V by default, why is a 3.3V signal in that PIN stopping the board from booting?