CONFIG_ARCH_S5P6440 is not available for thedefaultarchitecture x86.
Result is shown for architecture arm
Samsung S5P6440
configname: CONFIG_ARCH_S5P6440
ARM system type
└─>Samsung S5P6440
In linux kernel since version 2.6.34 (release Date: 2010-05-16)
Samsung S5P6440 CPU based systems