LCD screen

We have attached an LCD screen (4G) to our BBB rev C, and the serial port /dev/ttyO2 has vanished. Is this expected? Also the boot time has become ridiculous - it take about 4 minutes (including multiple reboots) to get to the (Debian) desktop. Can this be fixed?

With my 4DCAPE_43T LCD only UART1 is available.

Keith