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

BOCK-W platform

modulename: board-bockw.ko

configname: CONFIG_MACH_BOCKW

Linux Kernel Configuration
└─>BOCK-W platform
In linux kernel since version 3.1 (release Date: 2011-10-24)  
source code:
arch/arm/mach-shmobile/board-bockw.c