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Subject: Re: [RFC,PATCH v2] efi: Add support for a UEFI variable filesystem
From: joeyli <jlee@suse.com>
To: jeremy.kerr@canonical.com, Matthew Garrett <mjg@redhat.com>
Cc: linux-kernel@vger.kernel.org, "H. Peter Anvin" <hpa@zytor.com>,
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Date: Thu, 13 Sep 2012 16:10:43 +0800
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於 二，2012-09-11 於 15:23 +0800，lee joey 提到：
> From: Matthew Garrett <mjg@redhat.com>
> 
> 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@canonical.com>.
> 
> Signed-off-by: Matthew Garrett <mjg@redhat.com>
> Signed-off-by: Jeremy Kerr <jeremy.kerr@canonical.com>
> 
> ---
> v2: Add check for < 4-byte writes 

Do we have plan to create a new kobject add to /sys/firmware/efi for
provide a fixed mount point to efivars fs?
e.g. /sys/firmware/efi/efivars

Or we just direct reuse current /sys/firmeware/efi/vars? But, that means
we need think for the backward compatibility if choice reuse vars
folder.


Thanks a lot!
Joey Lee