CONFIG_CPU_S3C2412 is not available for thedefaultarchitecture x86.
Result is shown for architecture arm

Samsung S3C2412

modulename: s3c2412.ko

and/or

configname: CONFIG_CPU_S3C2412

Linux Kernel Configuration
└─>Samsung S3C24XX SoCs Support
└─>Samsung S3C2412
In linux kernel since version 2.6.18 (release Date: 2006-09-19)  
Support for the S3C2412 and S3C2413 SoCs from the S3C24XX line