CONFIG_BOOKE is not available for thedefaultarchitecture x86.
Result is shown for architecture powerpc

CONFIG_BOOKE (not configurable)

modulename: dcr.ko

configname: CONFIG_BOOKE

Linux/PowerPC Kernel Configuration
└─>Processor support
└─>BOOKE
In linux kernel since version 2.6.15 (release Date: 2006-01-02)  
source code:
arch/powerpc/sysdev/

is selected by
CONFIG_BOOKE_WDT