CONFIG_NLM_XLR_BOARD is not available for thedefaultarchitecture x86.
Result is shown for architecture mips

Netlogic XLR/XLS based systems

configname: CONFIG_NLM_XLR_BOARD

System type
└─>Netlogic XLR/XLS based systems
In linux kernel since version 3 (release Date: 2011-07-21)  
Support for systems based on Netlogic XLR and XLS processors.
Say Y here if you have a XLR or XLS based board.


depends
CONFIG_EXPERIMENTAL