CONFIG_SMDK2440_CPU2440 is not available for thedefaultarchitecture x86.
Result is shown for architecture arm

SMDK2440 with S3C2440 CPU module

configname: CONFIG_SMDK2440_CPU2440

Linux Kernel Configuration
└─>SAMSUNG S3C24XX SoCs Support
└─>SMDK2440 with S3C2440 CPU module
In linux kernel since version 2.6.18 (release Date: 2006-09-19)