CONFIG_BF52x is not available for thedefaultarchitecture x86.
Result is shown for architecture blackfin
default or selected kernelversion does not have config value CONFIG_BF52x.
Result is shown for kernelversion 6.7-rc3

CONFIG_BF52x (not configurable)

configname: CONFIG_BF52x

Linux Kernel Configuration
└─>BF52x
In linux kernel since version 2.6.24 (release Date: 2008-01-24)