CONFIG_CPU_S5PC100 is not available for thedefaultarchitecture x86.
Result is shown for architecture arm

CONFIG_CPU_S5PC100 (not configurable)

modulename: cpu.ko

configname: CONFIG_CPU_S5PC100

Linux Kernel Configuration
└─>CPU_S5PC100
In linux kernel since version 2.6.32 (release Date: 2009-12-02)  
Enable S5PC100 CPU support

source code:
arch/arm/mach-s5pc100/cpu.c