CONFIG_BOARD_MERISC is not available for thedefaultarchitecture x86.
Result is shown for architecture avr32
default or selected kernelversion does not have config value CONFIG_BOARD_MERISC.
Result is shown for kernelversion 6.5.1

Merisc board

configname: CONFIG_BOARD_MERISC

AVR32 board type
└─>Merisc board
In linux kernel since version 2.6.30 (release Date: 2009-06-09)  
Merisc is the family name for a range of AVR32-based boards.

The boards are designed to be used in a man-machine
interfacing environment, utilizing a touch-based graphical
user interface. They host a vast range of I/O peripherals as
well as a large SDRAM & Flash memory bank.

For more information see: http://www.martinsson.se/merisc