Support for console on MILBEAUT USIO/UART serial port

configname: CONFIG_SERIAL_MILBEAUT_USIO_CONSOLE

Linux Kernel Configuration
└─>Device Drivers
└─>Character devices
└─>Serial drivers
└─>Support for console on MILBEAUT USIO/UART serial port
In linux kernel since version 5.1 (release Date: 2019-05-05)  
Say 'Y' here if you wish to use a USIO/UART of Socionext Milbeaut
SoCs as the system console (the system console is the device which
receives all kernel messages and warnings and which allows logins in
single user mode).