Support for console on AT91 / AT32 serial port

configname: CONFIG_SERIAL_ATMEL_CONSOLE

Linux Kernel Configuration
└─>Device Drivers
└─>Character devices
└─>Serial drivers
└─>Support for console on AT91 / AT32 serial port
In linux kernel since version 2.6.20 (release Date: 2007-02-04)  
Say Y here if you wish to use an on-chip UART on a Atmel
AT91 or AT32 processor 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).