Skip to main content Link Menu Expand (external link) Document Search Copy Copied
OpenCore Configuration

Mandatory Variables

Warning: These variables may be added by the PlatformNVRAM or Generic subsections of the PlatformInfo section. Using PlatformInfo is the recommended way of setting these variables.

The following variables are mandatory for macOS functioning:

  • 4D1EDE05-38C7-4A6A-9CC6-4BCCA8B38C14:FirmwareFeatures 32-bit FirmwareFeatures. Present on all Macs to avoid extra parsing of SMBIOS tables.
  • 4D1EDE05-38C7-4A6A-9CC6-4BCCA8B38C14:FirmwareFeaturesMask 32-bit FirmwareFeaturesMask. Present on all Macs to avoid extra parsing of SMBIOS tables.
  • 4D1EDE05-38C7-4A6A-9CC6-4BCCA8B38C14:MLB BoardSerialNumber. Present on newer Macs (2013+ at least) to avoid extra parsing of SMBIOS tables, especially in boot.efi.
  • 4D1EDE05-38C7-4A6A-9CC6-4BCCA8B38C14:ROM Primary network adapter MAC address or replacement value. Present on newer Macs (2013+ at least) to avoid accessing special memory region, especially in boot.efi.