Unsupported-6900XT-Hackintosh-Fix

This guide is made to get certain RX 6900XT cards working in Mac OS. Currently, 6900XT cards of the XTX varaint work fine under Mac OS Big Sur and Monterey. However, the XTXH variant of the 6900XT, such as the PowerColor RX 6900XT Ultimate, are not natively supported currently (Mac OS Monterey 12.0.1 as of writting this guide).

I have posted my full EFI config with my RX 6900XT working in another repository if you would like to look over that too.

Prerequisites

Follow the OpenCore dortania guide to get the right config set-up for your system
Get the latest Whatevergreen kext as support for device-id GPU spoofing was added in 1.5.2
Install gfxutil
Install IORegistryExplorer
Install MaciASL
Install ProperTree or any program to edit plist file

Getting Info

Gfxutil

Run gfxutil (./gfxutil)
Look for the entry that ends with GFX0@0
- For example, my line is 03:00.0 1002:73bf /PCI0@0/PEG1@1/PEGP@0/BRG0@0/GFX0@0 = PciRoot(0x0)/Pci(0x1,0x0)/Pci(0x0,0x0)/Pci(0x0,0x0)/Pci(0x0,0x0)
Write down the path to GFX0@0
- Etc. /PCI0@0/PEG1@1/PEGP@0/BRG0@0/GFX0@0

IORegestryExplorer

Run IORegistryExplorer app
On the top left, search for GFX0@0
This will bring up a path to GFX0@0
- If the gpu is not supported, you will see a different path than what gfxutil gave you
- For example, my path was PCI0@0/PEG1@1/PEP@0/pci-device@0/GFX@0
Write down this path as well

Making SSDT-BRG0.aml

Download the SSDT-BRG0.dsl from the OpenCore repository
- If downloaded a release of OpenCore, get the file from (OpenCoreFolderPath)/Docs/AcpiSamples/Source
- If cloned the repo, get the file from (OpenCoreRepoPath)/Docs/AcpiSamples/Source
- I included my own modified version of this file in this repo. Use it if you want
Open this file with MaciASL
On lines 12 and 14 (13 and 16 for my file), you will see External and Scope
- The default path listed is PCI0.PEG0.PEGP
- You need to change it to the path given by gfxutil
  - For example, my path above was PCI0@0/PEG1@1/PEP@0/pci-device@0/GFX@0, so I would change PCI0.PEG0.PEGP to PCI0.PEG1.PEGP
On line 20 (22 for my file), there is Device.
- If gfxutil path to GFX0@0 says something different then BRG0, then change this as well
After you are done with the changes, Save-As the file as SSDT-BRG0.aml with the file format as ACPI Machine Language Binary
Add the file in you EFI/OC/ACPI folder

Edit config.plist

Open your config.plist file with a plist editor program
Under ACPI -> Add -> (next biggest number), add the SSDT-BRG0.aml file
- ProperTree can add this automatically by using Cmd+R
Under DeviceProperties -> Add, make a new child with the name of the path of the gfx card found with gfxutil with it being a Dictionary type
- It will be the second value found by gfxutil
  - Example, PciRoot(0x0)/Pci(0x1,0x0)/Pci(0x0,0x0)/Pci(0x0,0x0)/Pci(0x0,0x0)
- Make two children under this new dictionary, device-id and model
  - device-id will be Data type
  - model will be String type
- Make the device-id have the value of BF730000
- Make the model have the value Radeon RX 6900 XT (XTXH)
Under NVRAM -> Add -> 7C436110-AB2A-4BBB-A880-FE41995C9F82 -> boot-args, append the boot arg agdpmod=pikera -radcodec
- -radcodec: Used for allowing officially unsupported AMD GPUs (spoofed) to use the Hardware Video Encoder
Save the file

Test config

Restart your hackintosh and see the results
Check metal scores with the gpu to see if its working

Additional Options

If using VDADecoder, it may not say you have video acceleration
- To fix this, type in the terminal defaults write com.apple.AppleGVA gvaForceAMDAVCDecode -boolean yes

Feedback

If theres any problems with this guide, please open an issue and I'll get to it as soon as possible.

TylerLyczak / Unsupported-6900XT-Hackintosh-Fix