CONFIG_BFIN_ALIVE_LED is not available for thedefaultarchitecture x86.
Result is shown for architecture blackfin
default or selected kernelversion does not have config value CONFIG_BFIN_ALIVE_LED.
Result is shown for kernelversion 5.13-rc2

Enable Board Alive

configname: CONFIG_BFIN_ALIVE_LED

Blackfin Kernel Configuration
└─>Blackfin Processor Options
└─>Board customizations
└─>Enable Board Alive
In linux kernel since version 2.6.24 (release Date: 2008-01-24)  
Blink the LEDs you select when the kernel is running. Helps detect
a hung kernel.