CONFIG_CPU_DCACHE_WRITETHROUGH is not available for thedefaultarchitecture x86.
Result is shown for architecture unicore32

Force write through D-cache

configname: CONFIG_CPU_DCACHE_WRITETHROUGH

Linux Kernel Configuration
└─>Force write through D-cache
In linux kernel since version 2.6.12  
Say Y here to use the data cache in writethrough mode. Unless you
specifically require this or are unsure, say N.

is depended by
CONFIG_ARCH_DAVINCI_DA830