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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>
This commit is contained in:
Felix Held 2023-08-21 19:02:52 +02:00
parent eb08ae4ce1
commit 048c2f2ac0
2 changed files with 12 additions and 0 deletions
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Documentation/acpi/index.md
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@ -11,6 +11,9 @@ upwards.
- [GPIO toggling in ACPI AML](gpio.md)
## Windows-specific ACPI documentation
- [Windows-specific documentation](windows.md)
## ACPI specification - Useful links

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Documentation/acpi/windows.md Normal file
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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read and use the ACPI tables in memory instead of an outdated cached version.