The main places to check: Missing EC patch: Make sure you have your EC SSDT both in EFIOCACPI and ACPI - Add, double check its enabled.Couldnt allocate runtime area errors Stuck on RTC., PCI Configuration Begins, Previous Shutdown., HPET, HID: Legacy.Stuck at ACPI table loading on B550 Waiting for Root Device or Prohibited Sign error Kernel panic with IOPCIFamily on X99 Stuck on or near IOConsoleUsers: gIOScreenLock.gIOLockState (3.Scrambled Screen on laptops Black screen after IOConsoleUsers: gIOScreenLock.
Re Could Not Create A Preboot Volume For Apfs Mac OS X Is NotStuck on EBLOG:EXITBS:START Stuck on EndRandomSeed Stuck after selecting macOS partition in OpenCore Kernel Panic on Invalid frame pointer Stuck on EBLD:OFS Err(0xE) when booting preboot volume Stuck on OCB: LoadImage failed - Security Violation Stuck on OCABC: Memory pool allocation failure - Not Found Stuck on Buffer Too Small Stuck on Plist only kext has CFBundleExecutable key Stuck on This version of Mac OS X is not supported: Reason Mac. Couldnt allocate runtime area errors Stuck on RTC., PCI ConfigurationBegins, Previous Shutdown., HPET, HID: Legacy. Stuck at ACPI Table loading on B550 Waiting for Root Device or Prohibited Sign error Kernel panic with IOPCIFamily on X99 Stuck on or near IOConsoleUsers: gIOScreenLock. More info here: Using DevirtualiseMmio For TRx40 users, enable this quirk For X99 users, disable this quirk as it breaks with some firmwares SetupVirtualMap This quirk is required for the majority of firmwares and without it its very common to kernel panic here, so enable it if not already. Dell Inspiron 5370) even with MATs support will halt on boot up, in these cases youll have two options. With EnableWriteUnprotector and disable RebuildAppleMemoryMap SyncRuntimePermissions ) Enable DevirtualiseMmio and follow MmioWhitelist guide (opens new window) 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. Re Could Not Create A Preboot Volume For Apfs How To Get AIssue is its 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 ): OCABC: MAT support is 1. ![]() Clover uses MatchOS while OpenCore has MinKernel and Maxkernel ). Legacy Intel users For macOS Big Sur, many firmwares have issues determining the CPU core count and thus will kernel panic too early for screen printing. Via serial, you can see the following panic: maxcpusfromfirmware not yet initialized. Only use the below patch if AvoidRuntimeDefrag didnt work: Legacy CPU Core patch 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 Type Value Base String acpicountenabledlogicalprocessors Count Integer 1 Enabled Boolean True Find Data Identifier String Kernel Limit Integer 0 Mask Data MaxKernel String MinKernel String 20.0.0 Replace Data B804000000C3 ReplaceMask Data Skip Integer 0 UEFI Issues ProvideConsoleGop Needed for transitioning to the next screen, this was originally part of AptioMemoryFix but is now within OpenCore as this quirk. Can be found under UEFI - Output Note as of 0.5.6, this quirk is enabled by default in the sample.plist IgnoreInvalidFlexRatio This is needed for Broadwell and older. Not for AMD and Skylake or newer Stuck on EndRandomSeed Same issues above, see here for more details: Stuck on EBLOG:EXITBS:START Stuck after selecting macOS partition in OpenCore Same issues above, see here for more details: Stuck on EBLOG:EXITBS:START Note: Enabling DEBUG OpenCore can help shed some light as well Kernel Panic on Invalid frame pointer So this is due to some issue around the Booter - Quirks you set, main things to check for: DevirtualiseMmio Certain MMIO spaces are still required to function correctly, so youll need to either exclude these regions in Booter - MmioWhitelist or disable this quirk outright More info here: Using DevirtualiseMmio SetupVirtualMap This quirk is required for the majority of firmwares and without it its very common to kernel panic here, so enable it if not already. Issue is its not always obvious if an OEM has updated the firmware, you can check the OpenCore logs whether yours supports it: OCABC: MAT support is 1. ![]() To resolve this you can do one of the following: Disable SecureBootModel. Stuck on This version of Mac OS X is not supported: Reason Mac. This error happens when SMBIOS is one no longer supported by that version of macOS, make sure values are set in PlatformInfo-Generic with Automatic enabled. Re Could Not Create A Preboot Volume For Apfs Full List OfFor a full list of supported SMBIOS and their OSes, see here: Choosing the right SMBIOS Supported SMBIOS in macOS 10.15, Catalina iMac13,x iMacPro1,1 MacPro6,1 Macmini6,x MacBook8,1 MacBookAir5,x MacBookPro9,x Supported SMBIOS in macOS 11, Big Sur iMac14,4 iMacPro1,1 MacPro6,1 Macmini7,1 MacBook8,1 MacBookAir6,x MacBookPro11,x Couldnt allocate runtime area errors See Fixing KASLR slide values Stuck on RTC., PCI Configuration Begins, Previous Shutdown., HPET, HID: Legacy. Well this general area is where a lot of PCI devices are first setup and configured, and is where most booting issues will happen. Other names include: apfsmodulestart., Waiting for Root device, Waiting on.IOResources., previous shutdown cause.
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