CONFIG_S3C6400_SETUP_SDHCI is not available for thedefaultarchitecture x86.
Result is shown for architecture arm

CONFIG_S3C6400_SETUP_SDHCI (not configurable)

modulename: setup-sdhci.ko

configname: CONFIG_S3C6400_SETUP_SDHCI

Linux Kernel Configuration
└─>S3C6400_SETUP_SDHCI
In linux kernel since version 2.6.31 (release Date: 2009-09-09)  
Internal configuration for default SDHCI
setup for S3C6400.

source code:
arch/arm/mach-s3c6400/setup-sdhci.c
is depended by
CONFIG_MACH_SMDK6400