CONFIG_BFIN_DCACHE is not available for thedefaultarchitecture x86.
Result is shown for architecture blackfin
default or selected kernelversion does not have config value CONFIG_BFIN_DCACHE.
Result is shown for kernelversion 6.7-rc3

Enable DCACHE

configname: CONFIG_BFIN_DCACHE

Linux Kernel Configuration
└─>Blackfin Processor Options
└─>Enable DCACHE
In linux kernel since version 2.6.24 (release Date: 2008-01-24)