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EFI to grub to DOS?

From: Greg Grotsky
Subject: EFI to grub to DOS?
Date: Wed, 18 Jul 2012 10:13:13 -0600

  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
  chainloader +1

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