CONFIG_BFIN_IDLE_LED is not available for thedefaultarchitecture x86.
Result is shown for architecture blackfin
Enable System Load/Idle LED
configname: CONFIG_BFIN_IDLE_LED
Blackfin Kernel Configuration
└─>Blackfin Processor Options
└─>Board customizations
└─>Enable System Load/Idle LED
In linux kernel since version 2.6.24 (release Date: 2008-01-24)
Blinks the LED you select when to determine kernel load.