CONFIG_S5PC100_SETUP_I2C1 is not available for thedefaultarchitecture x86.
Result is shown for architecture arm

CONFIG_S5PC100_SETUP_I2C1 (not configurable)

modulename: setup-i2c1.ko

configname: CONFIG_S5PC100_SETUP_I2C1

Linux Kernel Configuration
└─>S5PC100_SETUP_I2C1
In linux kernel since version 2.6.32 (release Date: 2009-12-02)  
Common setup code for i2c bus 1.

source code:

is depended by
CONFIG_MACH_SMDKC100