GRUB2 and Chainloading Open Core 0.6.5 and newer.

HenryV · March 22

Through version 0.6.4 chainloading was relatively simple. It now appears that Open Core 0.6.5 and newer have undergone code change that prevents chainloading the OpenCore.efi directly from GRUB2.

However, if you want to continue to use GRUB2 as your main ESP bootloader, you can install Refind 0.13.2 to your ESP alongside GRUB2 and chainload to Refind in grub.conf with the following (where xxxx:xxxx is your ESP UUID}:

menuentry "refind"{
   insmod part_gpt
   search --no-floppy --set=root --fs-uuid xxxx-xxxx
   chainloader /EFI/refind/refind_x64.efi
}

You may have to change the Vault configuraton in Open Core config.plist from Secure to Optional.

Here is a sample refind.conf that will chainload Open Core 0.6.7 (where xxxx is the volume name of your Open Core partition:

menuentry "OpenCore 0.6.7" {
    icon /EFI/refind/icons/os_mac.png
   volume xxxx
   loader /EFI/OC/OpenCore.efi
   options "-v"
}

This is an extra step but it preserves GRUB2 as the main bootloader and facilitates use of newer Open Core version 0.6.7.

GRUB2 and Chainloading Open Core 0.6.5 and newer.

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