diff options
| author | Matt Fleming <matt.fleming@intel.com> | 2012-10-04 09:57:31 +0100 |
|---|---|---|
| committer | John Rigby <john.rigby@linaro.org> | 2012-11-14 18:19:43 -0700 |
| commit | cbe803554c52554560d2389548b3b26b308ccb50 (patch) | |
| tree | d9503ea9c351b30c26a1cc4cd614fd47e32f1434 | |
| parent | 82409539cfc561fa21271cced7bec4a84e3ecc74 (diff) | |
UBUNTU: SAUCE: efivarfs: Add documentation for the EFI variable filesystem
BugLink: http://bugs.launchpad.net/bugs/1063061
Signed-off-by: Matt Fleming <matt.fleming@intel.com>
(cherry-picked from commit 91a8a3052685c61d6061c0b11376edfee9d74f61 git://git.kernel.org/pub/scm/linux/kernel/git/mfleming/efi.git)
Signed-off-by: Andy Whitcroft <apw@canonical.com>
Signed-off-by: Tim Gardner <tim.gardner@canonical.com>
| -rw-r--r-- | Documentation/filesystems/00-INDEX | 2 | ||||
| -rw-r--r-- | Documentation/filesystems/efivarfs.txt | 16 |
2 files changed, 18 insertions, 0 deletions
diff --git a/Documentation/filesystems/00-INDEX b/Documentation/filesystems/00-INDEX index 8c624a18f67..7b52ba7bf32 100644 --- a/Documentation/filesystems/00-INDEX +++ b/Documentation/filesystems/00-INDEX @@ -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 diff --git a/Documentation/filesystems/efivarfs.txt b/Documentation/filesystems/efivarfs.txt new file mode 100644 index 00000000000..c477af086e6 --- /dev/null +++ b/Documentation/filesystems/efivarfs.txt @@ -0,0 +1,16 @@ + +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 |