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OpenCore Configuration

Recommended Variables

The following variables are recommended for faster startup or other improvements:

  • 4D1EDE05-38C7-4A6A-9CC6-4BCCA8B38C14:BridgeOSHardwareModel

    Bridge OS hardware model variable used to propagate to IODT bridge-model by EfiBoot. Read by hw.target sysctl, used by SoftwareUpdateCoreSupport.

  • 7C436110-AB2A-4BBB-A880-FE41995C9F82:csr-active-config

    32-bit System Integrity Protection bitmask. Declared in XNU source code in csr.h.

  • 4D1EDE05-38C7-4A6A-9CC6-4BCCA8B38C14:ExtendedFirmwareFeatures

    Combined FirmwareFeatures and ExtendedFirmwareFeatures. Present on newer Macs to avoid extra parsing of SMBIOS tables.

  • 4D1EDE05-38C7-4A6A-9CC6-4BCCA8B38C14:ExtendedFirmwareFeaturesMask

    Combined FirmwareFeaturesMask and ExtendedFirmwareFeaturesMask. Present on newer Macs to avoid extra parsing of SMBIOS tables.

  • 4D1EDE05-38C7-4A6A-9CC6-4BCCA8B38C14:HW_BID

    Hardware BoardProduct (e.g. Mac-35C1E88140C3E6CF). Not present on real Macs, but used to avoid extra parsing of SMBIOS tables, especially in boot.efi.

  • 4D1EDE05-38C7-4A6A-9CC6-4BCCA8B38C14:HW_MLB

    Hardware BoardSerialNumber. Override for MLB. Present on newer Macs (2013+ at least).

  • 4D1EDE05-38C7-4A6A-9CC6-4BCCA8B38C14:HW_ROM

    Hardware ROM. Override for ROM. Present on newer Macs (2013+ at least).

  • 4D1EDE05-38C7-4A6A-9CC6-4BCCA8B38C14:SSN

    Serial number. Present on newer Macs (2013+ at least).

  • 7C436110-AB2A-4BBB-A880-FE41995C9F82:prev-lang:kbd

    ASCII string defining default keyboard layout. Format is lang-COUNTRY:keyboard, e.g. ru-RU:252 for Russian locale and ABC keyboard. Also accepts short forms: ru:252 or ru:0 (U.S. keyboard, compatible with 10.9). Full decoded keyboard list from AppleKeyboardLayouts-L.dat can be found here. Using non-latin keyboard on 10.14 will not enable ABC keyboard, unlike previous and subsequent macOS versions, and is thus not recommended in case 10.14 is needed.

  • 7C436110-AB2A-4BBB-A880-FE41995C9F82:security-mode

    ASCII string defining FireWire security mode. Legacy, can be found in IOFireWireFamily source code in IOFireWireController.cpp. It is recommended not to set this variable, which may speedup system startup. Setting to full is equivalent to not setting the variable and none disables FireWire security.

  • 4D1EDE05-38C7-4A6A-9CC6-4BCCA8B38C14:UIScale

    One-byte data defining boot.efi user interface scaling. Should be 01 for normal screens and 02 for HiDPI screens.

  • 7C436110-AB2A-4BBB-A880-FE41995C9F82:ForceDisplayRotationInEFI

    32-bit integer defining display rotation. Can be 0 for no rotation or any of 90, 180, 270 for matching rotation in degrees.

  • 4D1EDE05-38C7-4A6A-9CC6-4BCCA8B38C14:DefaultBackgroundColor

    Four-byte BGRA data defining boot.efi user interface background colour. Standard colours include BF BF BF 00 (Light Gray) and 00 00 00 00 (Syrah Black). Other colours may be set at user’s preference.