Yesterday Curt Brune of Cumulus Networks announced the latest release of Project ONIE, by the Open Compute Project:

This release contains a number of new hardware platforms, along with the usual enhancements and bug fixes. Some firmware excerpts from the announcement:

Documentation:
Updated x86 design specification to cover UEFI support:
https://github.com/opencomputeproject/onie/wiki/Design-Spec-x86-UEFI

Support for UEFI firmware machines:
42c7448 UEFI: initial support for ONIE on UEFI
a16e630 kvm_x86_64 vm: Update INSTALL instructions for UEFI

Firmware Update Mechanism:
a8e712b pending firmware update discovery mechanism
477cd47 x86 firmware update: add onie-fwpkg CLI tool

More Information:

https://github.com/opencomputeproject/onie/releases/tag/2015.08
http://lists.opencompute.org/pipermail/opencompute-onie/2015-August/000840.html