CONFIG_CPU_S3C2443 is not available for thedefaultarchitecture x86.
Result is shown for architecture arm

CONFIG_CPU_S3C2443 (not configurable)

modulename: s3c2443.ko

and/or

irq.ko

and/or

clock.ko

configname: CONFIG_CPU_S3C2443

Linux Kernel Configuration
└─>CPU_S3C2443
In linux kernel since version 2.6.21 (release Date: 2007-04-25)  
Support for the S3C2443 SoC from the S3C24XX line

source code:
arch/arm/mach-s3c2443/s3c2443.c