CONFIG_COLDFIRE is not available for thedefaultarchitecture x86.
Result is shown for architecture m68k

CONFIG_COLDFIRE (not configurable)

modulename: cache.ko

configname: CONFIG_COLDFIRE

Linux Kernel Configuration
└─>COLDFIRE
In linux kernel since version 2.6.12  
The Freescale ColdFire family of processors is a modern derivitive
of the 68000 processor family. They are mainly targeted at embedded
applications, and are all System-On-Chip (SOC) devices, as opposed
to stand alone CPUs. They implement a subset of the original 68000
processor instruction set.

source code: