The UEFI specification states a watchdog should be armed for 5 minutes.
Stop this from resetting a system when in efiboot.
Index: amd64/stand/efiboot/efiboot.c
===================================================================
RCS file: /cvs/src/sys/arch/amd64/stand/efiboot/efiboot.c,v
retrieving revision 1.28
diff -u -p -r1.28 efiboot.c
--- amd64/stand/efiboot/efiboot.c 25 Nov 2017 19:02:07 -0000 1.28
+++ amd64/stand/efiboot/efiboot.c 11 Feb 2018 05:25:11 -0000
@@ -81,6 +81,9 @@ efi_main(EFI_HANDLE image, EFI_SYSTEM_TA
RS = ST->RuntimeServices;
IH = image;
+ /* disable reset by watchdog after 5 minutes */
+ EFI_CALL(BS->SetWatchdogTimer, 0, 0, 0, NULL);
+
efi_video_init();
efi_heap_init();
Index: armv7/stand/efiboot/efiboot.c
===================================================================
RCS file: /cvs/src/sys/arch/armv7/stand/efiboot/efiboot.c,v
retrieving revision 1.19
diff -u -p -r1.19 efiboot.c
--- armv7/stand/efiboot/efiboot.c 21 Aug 2017 20:05:32 -0000 1.19
+++ armv7/stand/efiboot/efiboot.c 11 Feb 2018 05:25:11 -0000
@@ -71,6 +71,9 @@ efi_main(EFI_HANDLE image, EFI_SYSTEM_TA
BS = ST->BootServices;
IH = image;
+ /* disable reset by watchdog after 5 minutes */
+ EFI_CALL(BS->SetWatchdogTimer, 0, 0, 0, NULL);
+
status = EFI_CALL(BS->HandleProtocol, image, &imgp_guid,
(void **)&imgp);
if (status == EFI_SUCCESS)
Index: arm64/stand/efiboot/efiboot.c
===================================================================
RCS file: /cvs/src/sys/arch/arm64/stand/efiboot/efiboot.c,v
retrieving revision 1.15
diff -u -p -r1.15 efiboot.c
--- arm64/stand/efiboot/efiboot.c 6 Feb 2018 20:35:21 -0000 1.15
+++ arm64/stand/efiboot/efiboot.c 11 Feb 2018 05:25:12 -0000
@@ -74,6 +74,9 @@ efi_main(EFI_HANDLE image, EFI_SYSTEM_TA
BS = ST->BootServices;
IH = image;
+ /* disable reset by watchdog after 5 minutes */
+ EFI_CALL(BS->SetWatchdogTimer, 0, 0, 0, NULL);
+
status = EFI_CALL(BS->HandleProtocol, image, &imgp_guid,
(void **)&imgp);
if (status == EFI_SUCCESS)
