Review request for ACPI ECRs

Stephano Cetola

Slimming down the CC list a bit, as this is off topic for some lists.

On Fri, Jul 8, 2022 at 9:00 AM Heinrich Schuchardt <heinrich.schuchardt@...> wrote:
Does the Unified DIscovery Specification exit yet? Where can I find it?

 I'm in the process of getting status from the new Unified Discovery group:

We're hoping to have a concise draft definition for plummer's conference in sept.


Sunil V L

Hi All,

We plan to send below two ECRs to UEFI forum on 08/08/2022. These two
ECRs don't have any dependency on any unfrozen specs.
Getting these two ECRs accepted by UEFI forum would help us to enable big
chunk of ACPI infrastructure patches for RISC-V.


Please feel free to provide comments in the document before 08/08.
The documents and feedback will be archived in the same folder.


On Tue, Jul 05, 2022 at 10:46:18PM +0530, Sunil V L via wrote:
Hi All,

Thanks a lot for great feedback over last week on the ECRs. I have
created version 2 of the ECRs addressing most of the comments. We will be
discussing this version of the ECRs in this week's meeting. Please
provide your comments in this version of the documents.

1) Non-AIA ECRs
a) RHCT - version 2:
b)MADT RINTC - version 2:
a) MADT - AIA RINTC (version 2) :
b) MADT - AIA IMSIC/APLIC version 2:

PoC Code has been updated at same location as earlier.


On Tue, Jun 21, 2022 at 11:18:02PM +0530, Sunil V L via wrote:
Hi All,

Please review below Engineering Change Request (ECR) to update the ACPI
spec for enabling basic ACPI support for RISC-V.

1) Add INTC structure in MADT Table -

2) Add new RISC-V Hart Capabilities Table (RHCT).

3) Add AIA interrupt controllers in MADT table

First two ECRs do not have a dependency on any RVI specs which are not
frozen. But the third ECR has a dependency on AIA spec to be frozen.
Hence this AIA ECR will NOT be sent to UEFI forum until AIA spec is frozen.

The PoC for these ECRs is complete and ACPI enabled Linux boots on qemu
platform. Below are links to the source code for the PoC.
qemu -
edk2 -
edk2-platforms -
linux -

You can find how to build and test these changes in this link -

You can provide the feedback by commenting in the document itself. I am
hoping to send at least first two ECRs to UEFI forum by 8th August 2022.
So, appreciate your help to improve these ECRs before 4th August 2022
(45 days from today).

Feel free to reach out if you have any questions.