CONFIG_DEBUG_REALVIEW_STD_PORT is not available for thedefaultarchitecture x86.
Result is shown for architecture arm

RealView Default UART


Kernel low-level debugging port
└─>RealView Default UART
In linux kernel since version 3.1 (release Date: 2011-10-24)  
Say Y here if you want the debug print routines to direct
their output to the serial port on RealView EB, PB11MP, PBA8
and PBX platforms.