CONFIG_BF609 is not available for thedefaultarchitecture x86.
Result is shown for architecture blackfin
default or selected kernelversion does not have config value CONFIG_BF609.
Result is shown for kernelversion 6.7-rc3
BF609
configname: CONFIG_BF609
CPU
└─>BF609
In linux kernel since version 3.1 (release Date: 2011-10-24)
BF609 Processor Support.