Turn on the ZCU102 board using SW1, and wait until Linux loads on the board.
You can see the initial boot sequence messages on your terminal screen representing UART-0. The terminal screen configured for UART-1 also prints a message. This is the print message from the R5 bare-metal application running on the RPU, configured to use the UART-1 interface. This application is loaded by the FSBL onto the RPU.
Now that this application is running, notice the PS LED is being toggled by the application, and follow the instructions in the application terminal.