...
Wait untill installation is complete
After installation
You will be prompted to change the root users password, change it
Log in to the root user login and go into a shell
Create the /boot/loader.conf.local which will contain our pernmanent console enable, and add:
hw.uart.console="mm:0xfedc9000,rs:2"
console="efi"
Note: /boot/loader.conf recreates itself each boot or update, so this will override the changes.