tree 137fda7208fd3c7b2311f92d6dcc91a82da2bb34
parent 562c74e1ea52a399f7a6c416e35d98f4b37888cf
author Michael Brown <mcb30@ipxe.org> 1637768626 +0000
committer Michael Brown <mcb30@ipxe.org> 1637768626 +0000

[efi] Disable EFI watchdog timer when shutting down to boot an OS

The UEFI specification mandates that the EFI watchdog timer should be
disabled by the platform firmware as part of the ExitBootServices()
call, but some platforms (e.g. Hyper-V) are observed to occasionally
forget to do so, resulting in a reboot approximately five minutes
after starting the operating system.

Work around these firmware bugs by disabling the watchdog timer
ourselves.

Requested-by: Andreas Hammarskjöld <junior@2PintSoftware.com>
Signed-off-by: Michael Brown <mcb30@ipxe.org>