CONFIG_SMDK2440_CPU2440 is not available for the selected architecture x86.
Result is shown for architecture arm
SMDK2440 with S3C2440 CPU module
configname: CONFIG_SMDK2440_CPU2440
Linux Kernel Configuration
└─>S3C2440 and S3C2442 Machines
└─>SMDK2440 with S3C2440 CPU module