I think it would be worth specifically detailing the steps to achieve this, as its not immediately obvious how this would be done.

On 19/03/2018 15:27, Kyle Evans wrote:
Author: kevans
Date: Mon Mar 19 15:27:53 2018
New Revision: 331209
URL: https://svnweb.freebsd.org/changeset/base/331209

Log:
   Add note to UPDATING about UEFI changes requiring loader(8) update
These problems have only been observed with boards using U-Boot (e.g. ARM)
   where virtual addresses are already set in the memory map by the firmware
   and the firmware is expecting a call to SetVirtualAddressMap to be made.
   I refrain from mentioning this in the note because this could also be the
   case on some not-yet-tested firmware on amd64 and it's not a bad
   recommendation for the general case.

Modified:
   head/UPDATING

Modified: head/UPDATING
==============================================================================
--- head/UPDATING       Mon Mar 19 15:11:10 2018        (r331208)
+++ head/UPDATING       Mon Mar 19 15:27:53 2018        (r331209)
@@ -51,6 +51,13 @@ NOTE TO PEOPLE WHO THINK THAT FreeBSD 12.x IS SLOW:
****************************** SPECIAL WARNING: ****************************** +20180319:
+       For UEFI systems: the UEFI loader(8), loader.efi, should be updated in
+       conjunction with installing a new kernel after r330868. The kernel,
+       after this revision, will be more lenient when mapping addresses for
+       UEFI Runtime Services and this may result in a kernel panic without the
+       corresponding loader(8) update.
+
  20180212:
        FreeBSD boot loader enhanced with Lua scripting. It's purely opt-in for
        now by building WITH_LOADER_LUA and WITHOUT_FORTH in /etc/src.conf.


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