CONFIG_GOOGLE_MEMCONSOLE (not configurable)

modulename: memconsole.ko

configname: CONFIG_GOOGLE_MEMCONSOLE

Linux Kernel Configuration
└─>Firmware Drivers
└─>Google Firmware Drivers
└─>GOOGLE_MEMCONSOLE
In linux kernel since version 3.10 (release Date: 2013-06-30)  
source code:
drivers/firmware/google/memconsole.c