CONFIG_S3C64XX_SETUP_IDE is not available for thedefaultarchitecture x86.
Result is shown for architecture arm

CONFIG_S3C64XX_SETUP_IDE (not configurable)

modulename: setup-ide.ko

configname: CONFIG_S3C64XX_SETUP_IDE

Linux Kernel Configuration
└─>S3C64XX_SETUP_IDE
In linux kernel since version 2.6.36 (release Date: 2010-10-20)  
Common setup code for S3C64XX IDE.

source code:
arch/arm/mach-s3c64xx/setup-ide.c
depends
 or CONFIG_ARCH_S3C64XX

is depended by
CONFIG_MACH_SMDK6410