![]() ![]() To achieve this, the firmware must be modified to support writing to MSR E2. To ensure native CPU power management, CFG Lock bit must be set to 0x0. ![]() These patches fix the problem but the registry is still read-only. In OpenCore 2 others have been used: AppleCpuPmCfgLock (for AppleIntelPowerManagement.kext ) and AppleXcpmCfgLock (for the kernel). ![]() In Clover 2 patches have been used: KernelPM (for AppleIntelPowerManagement.kext) and KernelXCPM (for the kernel). Without the ability to write to MSR E2, all or most of the CPU power management is lost and the system does not boot. It defines the C-states of the CPU, which is why it is essential for macOS. When it is 0x1, macOS cannot write into this region and kernel patches are required. In those that do show the option to block or unblock this variable, it is usually called CFG Lock. ![]() Many motherboards come from factory with MSR E2 region locked (read but not write) and quite a few of them even hide this option in BIOS user interface. An MSR consists of one or more registers in blocks of instructions used to do certain tasks on a CPU.Ĭommands capable of reading and writing to MSR work with elevated privileges (the operating system, primarily). ![]()
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