Commit-ID: e913ca7d16d70b75367ff56a3b201980501d542c Gitweb: http://git.kernel.org/tip/e913ca7d16d70b75367ff56a3b201980501d542c Author: Matt Fleming <matt.fleming@xxxxxxxxx> AuthorDate: Thu, 4 Oct 2012 09:57:31 +0100 Committer: Matt Fleming <matt.fleming@xxxxxxxxx> CommitDate: Tue, 30 Oct 2012 10:39:18 +0000 efivarfs: Add documentation for the EFI variable filesystem Signed-off-by: Matt Fleming <matt.fleming@xxxxxxxxx> --- Documentation/filesystems/00-INDEX | 2 ++ 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 8c624a1..7b52ba7 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 0000000..c477af0 --- /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 -- To unsubscribe from this list: send the line "unsubscribe linux-tip-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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