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coreboot-kgpe-d16/Documentation/acpi/windows.md
Felix Held 048c2f2ac0 Documentation/acpi: add Windows-specific documentation 
When using the Windows fast startup mechanism which is enabled by
default, Windows will use a cached version of the ACPI tables during
normal boots after a clean shutdown. Since I've run into this issue and
spent quite a bit of time debugging the wrong issue due to this, better
document this possibly unexpected behavior.

Signed-off-by: Felix Held <felix-coreboot@felixheld.de>
Change-Id: Ia9e65f6a3aff13fa54abe68c8f5fcbf9bc6efc1a
Reviewed-on: https://review.coreboot.org/c/coreboot/+/77354
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Nico Huber <nico.h@gmx.de>
Reviewed-by: Paul Menzel <paulepanter@mailbox.org>
Reviewed-by: Matt DeVillier <matt.devillier@gmail.com>
2023-08-22 18:19:07 +00:00

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Testing ACPI changes under Windows

When testing ACPI changes in coreboot against Windows 8 or newer, beware that during a normal boot after a clean shutdown, Windows will use the fast startup mechanism which results in it not evaluating the changed ACPI code but instead using some cached version which won't include the changes that were supposed to be tested. In order for Windows to actually use the new ACPI tables, either disable the fast startup or just tell Windows to do a reboot which will make it read and use the ACPI tables in memory instead of an outdated cached version.