What is UEFI/EFI
The Unified Extensible Firmware Interface (UEFI) is a specification that defines a software interface between an operating system and platform firmware. UEFI is meant to replace the Basic Input/Output System (BIOS) firmware interface, present in all IBM PC-compatible personal computers.In practice, most UEFI images provide legacy support for BIOS services. UEFI can support remote diagnostics and repair of computers, even without another operating system.
How does OpenMandriva Lx support UEFI
OpenMandriva Lx 2014.0 is first release that supports UEFI booting. You should be able to boot on UEFI machines; however, we have only performed limited testing. We welcome feedback on user experience. It should be possible to boot the live system on the majority of machines; however, your mileage may vary. Please file bug reports at our bug tracker.
Troubleshooting with UEFI