OpenCore Z490-E (Comet Lake)

What works?

macOS

macOS Sonoma

Hardware

Dedicated GPU (RX 5700 XT)
iGPU (UHD 630)
NVMe drives
SATA drives
USB 3.1 (XHCI)
Ethernet
Wi-Fi
Bluetooth
Camera
Sound

Software

AirDrop
iMessage
FaceTime
Sidecar
Unlock with Apple Watch
QE/CI graphics acceleration
Metal support (Metal 3)
Temperature sensors
Sleep / Wake
RTC (protection)
Hyperthreading
Virtualisation
Memory bank configuration

Problems

HDMI on Intel UHD 630 (iGPU)
~~Wi-Fi and Bluetooth~~ ‏‏‎ ‏‏‎ ‎‎‏‏‎ ‎ 🎉 FIXED!
Having worked on my virtualised instances of macOS Catalina and macOS Monterey, I’m still unable to get stable Wi-Fi or Bluetooth support on macOS Sonoma with AirportItlwm.kext. Wi-Fi networks will often connect but crash the entire system after a minute or two. Strangely, Wi-Fi worked flawlessly in macOS Recovery, and I even used it to install macOS as I had not patched the I225-V ethernet yet.
This was fixed by using the debug (alpha) version of AirportItlwm.kext.
~~AirDrop~~ ‏‏‎ ‏‏‎ ‎‎‏‏‎ ‎ 🎉 FIXED!
As this relies on Wi-Fi and Bluetooth connectivity, while shown as available throughout the system, it sadly does not work at this time. As a workaround, I have been using LocalSend, a cross-platform alternative.
This was fixed by two seperate patches;
- Wi-Fi and Bluetooth fixed
- Secure Boot model changed from Default to j185f
~~Unlock with Apple Watch~~‏‏‎ ‏‏‎ ‎‎‏‏‎ ‎ 🎉 FIXED!
~~Again, as a Wi-Fi and Bluetooth reliant feature, unlocking with Apple Watch doesn’t work either right now.~~
This was fixed by two seperate patches;
- Wi-Fi and Bluetooth fixed
- Secure Boot model changed from Default to j185f
~~BIOS POSTs in “Safe Mode”~~‏‏‎ ‏‏‎ ‎‎‏‏‎ ‎ 🎉 FIXED!
After booting macOS, the next reboot always caused the BIOS to POST in a “safe mode” with the message The system has POSTed in safe mode. displayed. This is because macOS tries to write to disallowed areas of the RTC.
This was fixed by using using this guide.

System

The specs of my main system that the OpenCore configuration targets.

Motherboard	ASUS ROG STRIX Z490-E GAMING
CPU	Intel® Core™ i9-10900K
Chipset	Z490
Generation	Comet Lake
Memory	64 GB DDR4 3200MHz
Storage	500 GB WD Blue NVMe M.2
GPU	Intel UHD 630 AMD Radeon RX 5700 XT ~~NVIDIA RTX 3090~~ *
NIC	Intel I225-V 2.5Gb Ethernet

The system contains an NVIDIA RTX 3090 graphics card, but it has been intentionally disabled through a custom SSDT (SSDT-GPU-DISABLE.aml).

ACPI

SSDTs used:

SSDT-AWAC
SSDT-EC-USBX-DESKTOP
SSDT-GPU-DISABLE
SSDT-PLUG-DRTNIA
SSDT-RHUB
SSDT-RX5700XT ⎋

SSDT-GPU-DISABLE is a custom SSDT used to disable an NVIDIA RTX 3090 graphics card. It should be removed if config is being used on a different system.

SSDT-RX5700XT is an EXPERIMENTAL custom SSDT used to enhance the performance of an AMD RX 5700 XT graphics card. It should be removed if config is being used on a different system.

DeviceProperties

The following tables display the added PCI devices and their child keys.

PciRoot(0x0)/Pci(0x2,0x0)

Intel UHD 630 Graphics

Key	Type	Value
AAPL,ig-platform-id	Data	`0000923E`
device-id	Data	`923E7000`
framebuffer-fbmem	Data	`00009000`
framebuffer-patch-enable	Data	`01000000`
framebuffer-stolenmem	Data	`00003001`
framebuffer-unifiedmem	Data	`00000080`
hda-gfx	String	onboard-1

The current configuration of the Intel UHD 630 is not stable and is still being tweaked.

PciRoot(0x0)/Pci(0x1C,0x1)/Pci(0x0,0x0)

Intel I225-V 2.5Gb Ethernet

Key	Type	Value
device-id	Data	`F2150000`

The Intel I225-V requires a special patch mentioned in Kernel.

PciRoot(0x0)/Pci(0x1b,0x0)

Apple ALC

Key	Type	Value
AAPL,ig-platform-id	Data	`0300220D`
layout-id	Data	`01000000`

Kernel

The following shows the kernel configuration.

Kexts

Kexts used:

Lilu
WhateverGreen
AirportItlwm
IntelBluetoothFirmware
NVMeFix
RadeonSensor
VirtualSMC
AppleALC
BlueToolFixup
IntelBTPatcher
SMCProcessor
SMCRadeonGPU
SMCSuperIO
FeatureUnlock
RTCMemoryFixup
Z490E_USBMap

Z490E_USBMap.kext is a custom kext containing the USB mappings of my ASUS ROG STRIX Z490-E GAMING motherboard ports – your mileage may vary!

Patches

Intel I225-V 2.5Gb Ethernet

Key	Type	Value
Arch	String	Any
Base	String	__Z18e1000_set_mac_typeP8e1000_hw
Comment	String	I225-V patch
Count	Number	1
Enabled	Boolean	True
Find	Data	`F2150000`
Identifier	String	com.apple.driver.AppleIntelI210Ethernet
Limit	Number	0
Mask	Data
MaxKernel	String	20.4.0
MinKernel	String	19.0.0
Replace	Data	`F3150000`
ReplaceMask	Data
Skip	Number	0

Security

SecureBootModel 》 j185f

Vault 》 Optional

The secure boot model j185f corresponds to an iMac20,2 from August 2020.

NVRAM

Contents stored in NVRAM.

4D1EDE05-38C7-4A6A-9CC6-4BCCA8B38C14

Key	Type	Value
DefaultBackgroundColor	Data	`00000000`

4D1FDA02-38C7-4A6A-9CC6-4BCCA8B30102

Key	Type	Value
rtc-blacklist	Data

7C436110-AB2A-4BBB-A880-FE41995C9F82

Key	Type	Value
ForceDisplayRotationInEFI	Number	0
SystemAudioVolume	Data	`46`
boot-args	String	-v keepsyms=1 debug=0x100 alcid=1 agdpmod=pikera igfxgl=1 forceRenderStandby=0
csr-active-config	Data	`00000000`
prev-lang-diags:kbd	Data	`656E2D47 42`
prev-lang:kbd	Data	`656E2D47 423A32`
run-efi-updater	String	No
StartupMute	Data	`00`

SMBIOS

iMac20,2

Due to the system having a 10-core i9-10900K, the CPU model is similar to the one found in an iMac 5K 27-inch (i9, 2020), with a model identifier of iMac20,2.