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| author | Matt Fleming <matt.fleming@intel.com> | 2012-10-04 10:57:31 +0200 |
|---|---|---|
| committer | Matt Fleming <matt.fleming@intel.com> | 2012-10-30 11:39:18 +0100 |
| commit | e913ca7d16d70b75367ff56a3b201980501d542c (patch) | |
| tree | 96f0cd6b1672ed329861945e4aa2291b2d399f08 /Documentation/filesystems | |
| parent | efi: add efivars kobject to efi sysfs folder (diff) | |
| download | linux-e913ca7d16d70b75367ff56a3b201980501d542c.tar.xz linux-e913ca7d16d70b75367ff56a3b201980501d542c.zip | |
efivarfs: Add documentation for the EFI variable filesystem
Signed-off-by: Matt Fleming <matt.fleming@intel.com>
Diffstat (limited to 'Documentation/filesystems')
| -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 8c624a18f67d..7b52ba7bf32a 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 000000000000..c477af086e65 --- /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 |