Re: [RFC,PATCH v2] efi: Add support for a UEFI variable filesystem

From: joeyli
Date: Fri Sep 14 2012 - 22:31:31 EST

æ äï2012-09-11 æ 15:23 +0800ïlee joey æåï
> From: Matthew Garrett <mjg@xxxxxxxxxx>
> The existing EFI variables code only supports 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.
> So,
> instead, let's add a filesystem. Variables can be read, written and
> created, with the first 4 bytes of each variable representing its UEFI
> attributes. The create() method doesn't actually commit to flash since
> zero-length variables can't exist per-spec.
> Updates from Jeremy Kerr <jeremy.kerr@xxxxxxxxxxxxx>.
> Signed-off-by: Matthew Garrett <mjg@xxxxxxxxxx>
> Signed-off-by: Jeremy Kerr <jeremy.kerr@xxxxxxxxxxxxx>

I and Gary tested create, update, delete unauthenticated variable, works

Tested-by: Lee, Chun-Yi <jlee@xxxxxxxx>

Thanks a lot!
Joey Lee

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