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From: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
To: Tom Rini <trini@konsulko.com>
Cc: u-boot@lists.denx.de, Andre Przywara <andre.przywara@arm.com>,
	Heinrich Schuchardt <xypron.glpk@gmx.de>,
	Alexander Graf <agraf@csgraf.de>
Subject: Re: [PATCH 1/1] efi_loader: stop watchdogs in ExitBootServices()
Date: Tue, 9 Nov 2021 19:15:10 +0100	[thread overview]
Message-ID: <ab30b536-2919-903c-7691-e1c36f475a04@canonical.com> (raw)
In-Reply-To: <20211109175526.GW24579@bill-the-cat>

On 11/9/21 18:55, Tom Rini wrote:
> On Tue, Nov 09, 2021 at 11:19:01AM +0100, Heinrich Schuchardt wrote:
> 
>> The UEFI specification requires for ExitBootServices() that "the boot
>> services watchdog timer is disabled". We already disable the software
>> watchdog. We should additionally disable the hardware watchdogs.
>>
>> Reported-by: Andre Przywara <andre.przywara@arm.com>
>> Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
> 
> Let me start by saying thank you for bringing this up with UEFI folks as
> well.  To be clear, for right now I would much rather see U-Boot
> continue to be non-complaint with UEFI in this regard and assume that a
> running watchdog will be able to be handled by the running OS (which
> tends to be the case, but not always as sunxi has just shown) than to
> attempt to be complaint with the spec as it stands now as I am hopeful
> that we can get this case handled in a way that matches long standing
> industry practice.
> 

We have either merge this patch or

[1/1] watchdog: don't autostart watchdog on Sunxi boards
https://patchwork.ozlabs.org/project/uboot/patch/20211105183431.117221-1-heinrich.schuchardt@canonical.com/

or we will be breaking boot processes that have been running up to now.

As Sunxi watchdogs were only enabled by a recent patch disabling 
autostart should not cause any harm.

If you want to be able to deviate from the UEFI spec, this should be 
customizable and disabled by default.

Best regards

Heinrich

  reply	other threads:[~2021-11-09 18:15 UTC|newest]

Thread overview: 34+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-11-09 10:19 [PATCH 1/1] efi_loader: stop watchdogs in ExitBootServices() Heinrich Schuchardt
2021-11-09 10:19 ` Heinrich Schuchardt
2021-11-09 14:20   ` Michael Walle
2021-11-09 14:46     ` Mark Kettenis
2021-11-09 14:54       ` Michael Walle
2021-11-09 17:30         ` Heinrich Schuchardt
2021-11-09 17:55   ` Tom Rini
2021-11-09 18:15     ` Heinrich Schuchardt [this message]
2021-11-09 18:18       ` Tom Rini
2021-11-09 21:47         ` Andre Przywara
2021-11-09 23:45     ` Grant Likely
2023-01-28  8:57 Heinrich Schuchardt
2023-01-30 18:13 ` Tom Rini
2023-01-30 18:30   ` Tom Rini
2023-01-31 12:03     ` Ilias Apalodimas
2023-01-31 14:16       ` Simon Glass
2023-01-31 14:48         ` Heinrich Schuchardt
2023-01-31 15:07       ` Tom Rini
2023-02-01  8:32         ` Rasmus Villemoes
2023-02-01  9:00           ` Heinrich Schuchardt
2023-02-02  8:17             ` Etienne Carriere
2023-02-02 17:12               ` Simon Glass
2023-02-02 17:22                 ` Tom Rini
2023-02-03  2:15                   ` Simon Glass
2023-02-03  7:30                     ` Rasmus Villemoes
2023-02-07 14:59                       ` Michael Walle
2023-02-07 15:08                         ` Heinrich Schuchardt
2023-02-07 15:29                           ` Michael Walle
2023-02-07 15:30                             ` Heinrich Schuchardt
2023-02-07 15:34                               ` Michael Walle
2023-02-03 15:51                     ` Tom Rini
2023-02-04  0:20                       ` Simon Glass
2023-02-01 12:49           ` Mark Kettenis
2023-02-01 15:21             ` Tom Rini

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