CONFIG_S3C64XX_SETUP_FB_24BPP is not available for thedefaultarchitecture x86.
Result is shown for architecture arm

CONFIG_S3C64XX_SETUP_FB_24BPP (not configurable)

configname: CONFIG_S3C64XX_SETUP_FB_24BPP

Linux Kernel Configuration
└─>Samsung S3C64XX
└─>S3C64XX_SETUP_FB_24BPP
In linux kernel since version 2.6.29 (release Date: 2009-03-23)  
Common setup code for S3C64XX with an 24bpp RGB display helper.