CONFIG_ARCH_S5P64X0 is not available for the default architecture x86.
Result is shown for architecture arm
default or selected kernelversion does not have config value CONFIG_ARCH_S5P64X0.
Result is shown for kernelversion 3.9.9

Samsung S5P6440 S5P6450

configname: CONFIG_ARCH_S5P64X0

ARM system type
└─> Samsung S5P6440 S5P6450

Samsung S5P64X0 CPU based systems, such as the Samsung SMDK6440,