I purchased a 4-core Mac Pro on 14 April with the X1900 video card. This is needed for Broadwell and older.I've also got this problem.Note as of 0.5.6, this quirk is enabled by default in the ist.Needed for transitioning to the next screen, this was originally part of AptioMemoryFix but is now within OpenCore as this quirk.To do this, Add the following patch(replacing the 04 from B8 04 00 00 00 C3 with the amount of CPU threads your hardware supports): Key
Only use the below patch if AvoidRuntimeDefrag didn't work: Legacy CPU Core patch However on certain machines like the HP Compaq DC 7900, the firmware will still panic so we need to force a CPU core count value. Enable AvoidRuntimeDefrag under Booter -> Quirks.
Max_cpus_from_firmware not yet initialized Via serial, you can see the following panic:
Issue is it's not always obvious if an OEM has updated the firmware, you can check the OpenCore logs whether yours supports it( See here how to get a log): Regarding MATs support, firmwares built against EDK 2018 will support this and many OEMs have even added support all the way back to Skylake laptops.
Stuck on This version of Mac OS X is not supported: Reason Mac.Stuck on Plist only kext has CFBundleExecutable key.Stuck on OCABC: Memory pool allocation failure - Not Found.Stuck on OCB: LoadImage failed - Security Violation.Stuck on Err(0圎) when booting preboot volume.Stuck after selecting macOS partition in OpenCore.Getting started with ACPI (opens new window).