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acpi: Be more ACPI compliant when generating _UID

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* Add function to generate unique _UID using CRC32
* Add function to write the _UID based on a device's ACPI path

ACPI devices that have the same _HID must use different _UID.
Linux doesn't care about _UID if it's not used.
Windows 10 verifies the ACPI code on boot and BSODs if two devices
with the same _HID share the same _UID.

Fixes BSOD seen on Windows 10.

Change-Id: I47cd5396060d325f9ce338afced6af021e7ff2b4
Signed-off-by: Patrick Rudolph <patrick.rudolph@9elements.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/37695
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Philipp Deppenwiese <zaolin.daisuki@gmail.com>
This commit is contained in:
Patrick Rudolph
2019-12-13 12:16:06 +01:00
committed by Felix Held
parent 5c8ff794a8
commit c83bab62b3
9 changed files with 48 additions and 5 deletions
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2
Documentation/acpi/index.md
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@@ -2,6 +2,8 @@
This section contains documentation about coreboot on ACPI.
- [SSDT UID generation](uid.md)
## GPIO
- [GPIO toggling in ACPI AML](gpio.md)