CONFIG_DEBUG_S3C2410_UART is not available for thedefaultarchitecture x86.
Result is shown for architecture arm

CONFIG_DEBUG_S3C2410_UART (not configurable)

configname: CONFIG_DEBUG_S3C2410_UART

Linux Kernel Configuration
└─>Kernel hacking
└─>DEBUG_S3C2410_UART
In linux kernel since version 2.6.12