CONFIG_CPM1 is not available for thedefaultarchitecture x86.
Result is shown for architecture powerpc

CONFIG_CPM1 (not configurable)

modulename: cpm1.ko

configname: CONFIG_CPM1

Linux Kernel Configuration
└─>CPM1
In linux kernel since version 2.6.20 (release Date: 2007-02-04)  
source code:
arch/powerpc/platforms/8xx/cpm1.c
selects
CONFIG_CPM

is selected by
CONFIG_SERIAL_CPM