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Commit e913ca7d authored by Matt Fleming's avatar Matt Fleming
Browse files

efivarfs: Add documentation for the EFI variable filesystem 



Signed-off-by: default avatarMatt Fleming <matt.fleming@intel.com>
parent 605e70c7

Documentation/filesystems/00-INDEX

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@@ -38,6 +38,8 @@ dnotify_test.c 
	- example program for dnotify

ecryptfs.txt

	- docs on eCryptfs: stacked cryptographic filesystem for Linux.

efivarfs.txt

	- info for the efivarfs filesystem.

exofs.txt

	- info, usage, mount options, design about EXOFS.

ext2.txt

Documentation/filesystems/efivarfs.txt

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efivarfs - a (U)EFI variable filesystem



The efivarfs filesystem was created to address the shortcomings of

using entries in sysfs to maintain EFI variables. The old sysfs EFI

variables code only supported variables of up to 1024 bytes. This

limitation existed in version 0.99 of the EFI specification, but was

removed before any full releases. Since variables can now be larger

than a single page, sysfs isn't the best interface for this.



Variables can be created, deleted and modified with the efivarfs

filesystem.



efivarfs is typically mounted like this,



	mount -t efivarfs none /sys/firmware/efi/efivars