SoftLED Support

configname: CONFIG_CARL9170_LEDS

Linux Kernel Configuration
└─>Device Drivers
└─>Network device support
└─>Wireless LAN
└─>Atheros Wireless Cards
└─>SoftLED Support
In linux kernel since version 2.6.37 (release Date: 2011-01-04)  
This option is necessary, if you want your device' LEDs to blink

Say Y, unless you need the LEDs for firmware debugging.