[coreboot - Bug #611] (In Progress) I2C Controllers fail to initialize under Win11 with top-down allocation on pre-FSP 2.0 platforms

Matt DeVillier <[email protected]>
Newsgroups gmane.linux.bios
Message-ID <[email protected]>
Issue #611 has been updated by Matt DeVillier.

Status changed from New to In Progress

issue was coreboot's missing ACPI MMIO windows for a few platforms. patches pushed to resolve the issue:

https://review.coreboot.org/c/coreboot/+/89588
https://review.coreboot.org/c/coreboot/+/89589
https://review.coreboot.org/c/coreboot/+/89590

Haswell itself was not affected as initially suspected, nor any earlier platforms.

----------------------------------------
Bug #611: I2C Controllers fail to initialize under Win11 with top-down allocation on pre-FSP 2.0 platforms
https://ticket.coreboot.org/issues/611#change-2158

* Author: Matt DeVillier
* Status: In Progress
* Priority: Normal
* Category: coreboot common code
* Target version: none
* Start date: 2025-10-12
* Affected versions: main
----------------------------------------
When booting Win11 using edk2 payload and top-down resource allocation (which is now the default), pre-FSP 2.0 platforms all seem to have issues with the I2C controllers failing to initialize.

Windows Device Manager reports a Code 35 error:
Your computer's system firmware does not include enough information to properly configure and use this device. To use this device, contact your computer manufacturer to obtain a firmware or BIOS update.

Microsoft's support pages provide the following:

> Full Error Message
> 
> Your computer's system firmware does not include enough information to properly configure and use this device. To use this device, contact your computer manufacturer to obtain a firmware or BIOS update. (Code 35)
> 
> Cause
> 
> The Multiprocessor System (MPS) table, which stores the resource assignments for the BIOS, is missing an entry for your device and must be updated.
> 
> Recommended Resolution
> 
> Contact the manufacturer of your computer to update the BIOS. 

compiling with `RESOURCE_ALLOCATION_TOP_DOWN=n` resolves the issue

Tested on:
google/slippy (HSW)
google/auron (BSW)
google/rambi (BYT)
google/cyan (BSW)




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