Grub2 Reboot ISO - Similar process for Mac OS Bootloader I'd like to add a menu entry to the MAC OS Bootloader for a Linux ISO that resides on the harddrive. I am not looking to install a 3rd party bootloader, but do this with the bootloader MAC uses by default.

For example, on my Linux VM's I have the ISO reside on the HD and add a grub-entry for the LiveISO.

I can then use the command grub2-reboot "LiveISO" to reboot directly into the LiveOS without needing a USB.
You need startup files for your target OS.

1) Plug the Linux Installer on a Windows OS (It will mount the EFI partition only)
2) Copy the contents to some shared place to access it in Mac
3) Mount the EFI partition on your MAC
4) Copy the Linux startup files alongside Apple folder