Supporting legacy operating system booting in a legacy-free system

摘要

An alternative boot methodology that begins with legacy-free firmware allows the peaceful coexistence of legacy-free and legacy option ROMs in a system. Legacy-free firmware provides a legacy-free boot path from system power up to operating system loading. This legacy-free boot path is independent of any legacy firmware. A legacy-free boot manager boots from an ordered list of OS loaders. If a legacy boot option is available, legacy-free drivers that have already been loaded may be stopped, and a legacy boot using legacy firmware may be initiated, without having to reboot the system.