http://www.itworld.com/it-managementstr ... ux-booting
Windows 8 OEM specs may block Linux booting
"September 20, 2011, 9:45 PM —
After years of trying to cut off Linux growth as a desktop platform on x86 and x64 PCs, Microsoft may have actually figured out a way to stop Linux deployments on client PCs dead in their tracks.
At the very least, Linux deployment will be hindered on any Windows 8-certified machines to come, as new requirements for the Windows 8 logo come to light.
Red Hat's Matthew Garrett was one of the first to notice that according to the new logo rules, all Windows 8 machines will need to be have the Unified Extensible Firmware Interface (UEFI) instead of the venerable BIOS firmware layer. BIOS has been pretty much the sole firmware interface for PCs for a long time...."
"EFI, and the later UEFI specification, is not the problem for Linux. The problem is Microsoft's other requirement for any Windows 8-certified client: the system must support secure booting. This hardened boot means that "all firmware and software in the boot process must be signed by a trusted Certificate Authority (CA)..."
"It's not just a matter of replacing the UEFI system on the device with other, unencrypted, firmware. If all parts of the chain need to have a CA signature, then swapping out a machine's signed EFI layer with, say, an unsigned BIOS or EFI would not work. Garrett described the problem in more detail:
"Microsoft requires that machines conforming to the Windows 8 logo program and running a client version of Windows 8 ship with secure boot enabled. The two alternatives here are for Windows to be signed with a Microsoft key and for the public part of that key to be included with all systems, or alternatively for each OEM to include their own key and sign the pre-installed versions of Windows. The second approach would make it impossible to run boxed copies of Windows on Windows logo hardware, and also impossible to install new versions of Windows unless your OEM provided a new signed copy. The former seems more likely."
Fun, fun, fun!