CONFIG_BF516 is not available for thedefaultarchitecture x86.
Result is shown for architecture blackfin
default or selected kernelversion does not have config value CONFIG_BF516.
Result is shown for kernelversion 6.7-rc3

BF516

configname: CONFIG_BF516

CPU
└─>BF516
In linux kernel since version 2.6.29 (release Date: 2009-03-23)  
BF516 Processor Support.

is selected by
CONFIG_BFIN_MAC