From 0ddc47db89b19baf6c085fc86537631126f3ff5f Mon Sep 17 00:00:00 2001 From: Ahmad Fatoum Date: Wed, 23 Oct 2019 18:55:56 +0200 Subject: Documentation: efi: emphasize watchdog deactivation on ExitBootServices The UEFI specification paragraph quoted above notes: > The watchdog timer is only used during boot services. On successful > completion of ExitBootServices() the watchdog timer is disabled. Thus disabling the watchdog is _the_ only proper behavior. Adjust the wording accordingly. Cc: Oleksij Rempel Signed-off-by: Ahmad Fatoum Reviewed-by: Signed-off-by: Sascha Hauer --- Documentation/boards/efi.rst | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/Documentation/boards/efi.rst b/Documentation/boards/efi.rst index 2178c9ab42..f04b1d3237 100644 --- a/Documentation/boards/efi.rst +++ b/Documentation/boards/efi.rst @@ -350,7 +350,7 @@ https://uefi.org/sites/default/files/resources/UEFI_Spec_2_1_D.pdf Current linux kernel (v5.0) will execute ExitBootServices() during the early boot stage and thus will automatically disable the (U)EFI watchdog. Since it is -a proper behavior according to the (U)EFI specification, it is impossible to +the proper behavior according to the (U)EFI specification, it is impossible to protect full boot chain by using this watchdog only. It is recommended to use an alternative hardware watchdog, preferably started before the bootloader. If (U)EFI firmware lacks this feature, the bootloader should be able to start an alternative -- cgit v1.2.3