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NVRAM Emulada

Esta sección es para los que no tienen NVRAM nativo. El hardware más común que tiene NVRAM incompatible con macOS son X99 y ciertos chipsets de la serie X299:

  • X99
  • X299

Para B360, B365, H310, H370, Z390, usen SSDT-PMC y ponerlo en EFI/OC/ACPI y config.plist -> ACPI -> Add. Para más información about crear y compilar los SSDTs, dirígete a Getting started with ACPI

Note: CPUs de la 10a generación no necesitan esta SSDT

Cleaning out the Clover gunk

So some may not have noticed but Clover may have installed RC scripts into macOS for proper NVRAM emulation. Esto es un problema ya que it conflicts con la emulación de OpenCore.

Files to delete:

  • /Volumes/EFI/EFI/CLOVER/drivers64UEFI/EmuVariableUefi-64.efi
  • /Volumes/EFI/nvram.plist
  • /etc/rc.clover.lib
  • /etc/rc.boot.d/10.save_and_rotate_boot_log.local
  • /etc/rc.boot.d/20.mount_ESP.local
  • /etc/rc.boot.d/70.disable_sleep_proxy_client.local.disabled
  • /etc/rc.shutdown.d/80.save_nvram_plist.local​

If folders are empty then delete them as well:

  • /etc/rc.boot.d
  • /etc/rc.shutdown.d​

Verifying if you have working NVRAM

Para empezar, abre la terminal y corre the following one line at a time:

sudo -s
sudo nvram -c
sudo nvram myvar=test
exit

Ahora reinicía y corre esto:

nvram -p | grep -i myvar

If nothing returns then your NVRAM is not working. If a line containing myvar test returns, la NVRAM funciona.

Note: nvram -c requires SIP to be off, an alternative is to wipe NVRAM at the boot menu. Reminder you'll need Misc -> Security -> AllowNvramReset -> YES

Activar la NVRAM emulada (con nvram.plist)

Para activar la NVRAM emulada, necesitas puestan estas 3 cosas:

Dentro de la config.plist:

  • Booter:
    • DisableVariableWrite: set to NO
  • Misc -> Security:
    • ExposeSensitiveData: set to 0x3
  • NVRAM:
    • LegacyEnable: set to YES
    • LegacyOverwrite set to YES
    • LegacySchema: NVRAM variables set(OpenCore compares these to the variables present in nvram.plist)
    • WriteFlash: set to YES

Dentro tu EFI:

  • OpenRuntime.efi driver(this is needed for proper sleep, shutdown and other services to work correctly

Now grab the 'LogoutHook.command'(Inside /Utilities/LogoutHook/) and place it somewhere safe (e.g. within your user directory, as shown below):

/Users/(your username)/LogoutHook/LogoutHook.command

Abre la terminal y corre lo siguiente:

sudo defaults write com.apple.loginwindow LogoutHook /Users/(your username)/LogoutHook/LogoutHook.command

And voila! Tienes NVRAM emulada!

Do keep in mind this requires the nvram command to support the -x flag for this to work correctly which is unavailable on macOS 10.12 and below. If you are installing macOS 10.12 or earlier, you need to copy nvram.mojave into the same folder as LogoutHook.command, which fixes this by invoking it instead of the system nvram command.

Something else to note is that macOS is only able to read nvram.plist but it won't be able to write to nvram.plist unless running the shutdown process. This means running the test above won't work