linux-kernel - RE: [PATCH] efi/capsule: Make efi_capsule

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Date:	Thu, 5 May 2016 14:27:16 +0000
From:	"Kweh, Hock Leong" <hock.leong.kweh@...el.com>
To:	Matt Fleming <matt@...eblueprint.co.uk>,
	Bryan O'Donoghue <pure.logic@...us-software.ie>
CC:	"linux-efi@...r.kernel.org" <linux-efi@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Ard Biesheuvel <ard.biesheuvel@...aro.org>,
	joeyli <jlee@...e.com>, Borislav Petkov <bp@...en8.de>,
	"Ong, Boon Leong" <boon.leong.ong@...el.com>,
	"Ong, Kean Chai" <kean.chai.ong@...el.com>
Subject: RE: [PATCH] efi/capsule: Make efi_capsule_pending() lockless

> -----Original Message-----
> From: Matt Fleming [mailto:matt@...eblueprint.co.uk]
> Sent: Wednesday, May 04, 2016 10:36 PM
> To: Kweh, Hock Leong; Bryan O'Donoghue
> Cc: linux-efi@...r.kernel.org; linux-kernel@...r.kernel.org; Ard Biesheuvel;
> joeyli; Borislav Petkov
> Subject: Re: [PATCH] efi/capsule: Make efi_capsule_pending() lockless
> 
> On Wed, 04 May, at 02:20:42PM, Borislav Petkov wrote:
> >
> > Blergh.
> 
> Wilson, Bryan, what kind of rollback support does the Intel Quark have if its
> firmware update is interrupted?
> 
> The interruption could be for a number of reasons including power loss, or
> the example in this case, rebooting due to panic().

If not mistaken, the EFI firmware will not update a partially uploaded binary due to checksum error.
User is required to re-update the efi capsule again on the next boot up.


Regards,
Wilson