[PATCH 1/1] efi_loader: stop watchdogs in ExitBootServices()

Tom Rini trini at konsulko.com
Tue Nov 9 18:55:26 CET 2021

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 at arm.com>
> Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt at 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.

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