CONFIG_DEBUG_REALVIEW_PB1176_PORT is not available for thedefaultarchitecture x86.
Result is shown for architecture arm

RealView PB1176 UART


Kernel low-level debugging port
└─>RealView PB1176 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 standard serial port on the RealView
PB1176 platform.