EFI Variable filesystem

modulename: efivarfs.ko

configname: CONFIG_EFIVAR_FS

Linux Kernel Configuration
└─>File systems
└─>Pseudo filesystems
└─>EFI Variable filesystem
In linux kernel since version 3.1 (release Date: 2011-10-24)  
efivarfs is a replacement filesystem for the old EFI
variable support via sysfs, as it doesn't suffer from the
same 1024-byte variable size limit.

To compile this file system support as a module, choose M
here. The module will be called efivarfs.

If unsure, say N.

source code:
depends
CONFIG_EFI