EFI-based USB Target Disk Mode

This repository contains the EFI runtime component of my UEFI-based USB target disk mode solution.

You will need a GNU/Linux machine that supports building ELF objects for your target system (which POSIX-UEFI's toolchain converts into PE executables for us).

Getting build dependencies

POSIX-UEFI

Clone our upstream submodules:

git submodule update --init --recursive

Build POSIX-UEFI:

make -j$(nproc) -Cposix-uefi uefi

Building

make

Running with Qemu

If you have a GNU/Linux system with KVM enabled, you can run a demo like so:

./qemu_test.sh .

The above will put you at Tianocore's EFI shell. Simply type the following (and press enter) to run the application:

FS0:\targetdisk.efi

Running on real hardware

You can also run the .efi on any UEFI-compliant machine that matches the architecture that you just compiled for. It's easiest if you do it from the UEFI shell. If your machine doesn't have a Tianocore shell, you can use something like the Arch Linux install ISO to get one.

If you're an absolute madperson you can also add the .efi file to your EFI boot vars!

Further reading

• https://wiki.osdev.org/POSIX-UEFI
• https://uefi.org/specifications