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

BOCK-W - Reference Device Tree Implementation

modulename: board-bockw-reference.ko

configname: CONFIG_MACH_BOCKW_REFERENCE

Linux Kernel Configuration
└─>BOCK-W - Reference Device Tree Implementation
In linux kernel since version 3.12 (release Date: 2013-11-03)  
Use reference implementation of BockW board support
which makes use of device tree at the expense
of not supporting a number of devices.

This is intended to aid developers

source code: