Leif has a new blog post on using UEFI with USB pass-through.

[…]”One thing that is unsurprising, but very cool and useful, is that this works well cross-architecture. So you can test that your drivers are truly portable by building (and testing) them for AARCH64, EBC and X64 without having to move around between physical machines. ”

http://blog.eciton.net/uefi/qemu-usb-passthrough.html

Checkout his previous blog post, on UEFI driver development, as well as older posts on Linaro/ARM/UEFI history.