What is EFI?
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Question
Why is there an Extensible Firmware Interface (EFI) partition in the HP-UX 11i Version
2 system? Isn’t the HP Service Partition (HPSP) similar to the EFI partition?
Answer
The only boot mechanism for an IA64 platform is the EFI, a pre-boot interface which
is independent of operating system and platform. The EFI lies between the platform
firmware and the operating system, allowing the HP-UX system(also OPENVMS system) to boot without knowledge of the underlying hardware and firmware.
EFI supports boot devices, uses a flat memory model, and hides platform and firmware
details from the operating system. EFI consolidates platform firmware and boot
utilities, such as the Boot Console Handler (BCH) found in PA-RISC based systems,
into a single firmware platform. EFI allows the selection of any EFI system loader
from any boot medium that is supported by EFI boot services. An EFI operating system
loader supports multiple options on the user interface. An EFI-defined System
Partition is required by EFI to boot from a block device.
The HPSP is a separate partition, allocated by the operating system during a cold
installation. This partition is not accessed or used by the operating system. The HPSP
is reserved for use to run offline diagnostics when the operating system is not
running.
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