EFI to grub to DOS?

[Greg Grotsky]

  I have a system that has an option in the BIOS to choose boot style as "BIOS" or "UEFI". When I choose "BIOS" I can boot to a DOS partition without problems. When I choose "UEFI" I can boot to an EFI startup.nsh script without problems. I can't however boot to DOS from the "UEFI" boot selection.

 

My question is: can I set the option to "UEFI" and use grub to boot to DOS, somehow?

 

  I've done quite a bit of googling on this question and using this site I've been able to create a grub.efi file that I can execute from the EFI shell and can point to the DOS partition, but when I try to select it I get: "error: invalid EFI file path."

 

  I have seen a few examples of menuentry blocks that contain options like "fakebios" and "loadbios". I have used the method on the link above to create vbios.bin and int10.bin, can I use these to simulate the BIOS boot option in order to boot to DOS?

 

My current dos boot entry looks like this:

 

menuentry "DOS Boot" {

  set root=(hd0,1)

  loadbios /boot/vbios.bin /boot/int10.bin

  fakebios

  chainloader +1

}

 

Thanks,

-Greg