CONFIG_DEBUG_S3C2410_UART2 is not available for thedefaultarchitecture x86.
Result is shown for architecture arm

Use S3C2410/S3C2412 UART 2 for low-level debug

configname: CONFIG_DEBUG_S3C2410_UART2

Kernel low-level debugging port
└─>Use S3C2410/S3C2412 UART 2 for low-level debug
In linux kernel since version 3.16 (release Date: 2014-08-03)  
Say Y here if you want the debug print routines to direct
their output to UART 2. The port must have been initialised
by the boot-loader before use.