This guide works on macOS Monterey (12.0.1). C602 is even more complicated than X79 so I don't recommend beginners try this build.

For hardware configurations I mostly referenced this guide.

Unlike ASRock X79s, C602 motherboards have CFG locks. So you need to flash the BIOS to unlock it. Simply use UEFIPatch to patch the original file from ASRock.

The motherboard has Intel 82574L which is natively supported. However the different subvendor ID prevents the system from loading the driver. So you need to use Linux to flash the EEPROM. (I'm using Ubuntu as an example)

su root
apt install ethtool
ifconfig

Find out which port are you using. In my case, it's enp9s0. Then run the following command:

ethtool -E enp9s0 magic 0x10D38086 offset 0x16 value 0x00
ethtool -E enp9s0 magic 0x10D38086 offset 0x17 value 0x00
ethtool -E enp9s0 magic 0x10D38086 offset 0x1A value 0xF6
ethtool -E enp9s0 magic 0x10D38086 offset 0x16 value 0x00
ethtool -E enp9s0 magic 0x10D38086 offset 0x17 value 0x00
ethtool -E enp9s0 magic 0x10D38086 offset 0x18 value 0x86
ethtool -E enp9s0 magic 0x10D38086 offset 0x19 value 0x80

Note that the subvendor ID will be reverted back if you cut off the power supply. So prepare a permanent Ubuntu flash drive.

• If you set P state coordination to HW_ALL, CPU PM will not work properly(of course).

This ASRock motherboard doesn't have bcfg command in UEFI shell. So you need to first boot from USB and use another UEFI shell (OpenShell.efi won't work, The one in Clover works though) to add the boot menu. Assume that your EFI partition is fs1, run the following commands:

fs1:
cd \efi\boot
bcfg boot add 0 bootx64.efi "OpenCore"

Now you should be able to boot from SSD.

I have customized my USB Port files. However if your motherboard is different from mine, you may want to enable USBInjectAll.kext and do that again by yourself.

1. /EFI/CLOVER/ACPI/patched/SSDT-APIC.aml fixes the APIC table, which is equivalent to "Patch APIC" in Clover. Unfortunately you have to do it manually in OpenCore. For more information see this issue

2. /EFI/CLOVER/ACPI/patched/SSDT-PM.aml is the processor freq data generated by ssdtPRGen.

3. /EFI/CLOVER/ACPI/patched/SSDT-RENAME.aml renames GFX0 to GFX1, which is required to inject GPU fakeID. This file is PCIe slot specific. If you are using a different slot, you should follow this guide. If you have better solutions please let me know.

1. Extract installer

pkgutil --expand Install\ Intel\ Power\ Gadget.pkg ./tmp

2. Edit ./tmp/Distribution, delete the following part

                if(!(system.sysctl('hw.packages') == '1')) {
                    my.result.title = 'Multiple CPU Packages Not Supported';
                    my.result.message = 'Intel® Power Gadget does not currently support systems with more than one CPU package.';
                    my.result.type = 'Fatal';
                    return false;
                }

3. Re-pack installer

pkgutil --flatten ./tmp Intel.pkg

4. Double click to install.

USB 3.0 will interfere with Wi-Fi. No solution for now. Maybe a Faraday cage can work?

• Apple for the macOS
• teamawesome for the initial idea of the guide
• Acidanthera for Lilu, Whatevergreen and VirtualSMC
• naveenkrdy for AppleMCEReporterDisabler
• Piker-Alpha for ssdtPRGen