Sanboot 0x80 (local) on EFI

[PMiller96]

Hello,
I have an EFI dual-boot setup. (One disk with GPT partitions, including an EFI partition) I'd like to be able to boot locally, and to choose which .efi file to boot. As such, simply using 'exit' will not serve my purposes.
I have iPXE on a USB flash drive. (I've tried both 64-bit EFI and BIOS as well as the default 32-Bit BIOS.)

I expect the command:

Code:

sanboot --filename \efi\path\to\file.efi --no-describe --drive 0x80

to work. However, this simply states that the sanboot device cannot be found in EFI mode (2c222087) or that there is an Input/Output error in BIOS mode.

I've found very little documentation on this issue, with most people opting for the 'exit' method. I found somewhere that it could relate to EFI systems not working with sanboot, but then I see in the documentation that the '--filename' argument is specifically for EFI systems. So this leaves me a bit confused.

If anyone has any advice or suggestions, I'd be very open to hearing them.
Thanks!