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2 The Unified Extensible Firmware Interface (UEFI)
5 UEFI, the Unified Extensible Firmware Interface, is a specification
7 maintained by the UEFI Forum - http://www.uefi.org/.
9 UEFI is an evolution of its predecessor 'EFI', so the terms EFI and
10 UEFI are used somewhat interchangeably in this document and associated
11 source code. As a rule, anything new uses 'UEFI', whereas 'EFI' refers
14 UEFI support in Linux
16 Booting on a platform with firmware compliant with the UEFI specification
19 - UEFI Runtime Services
21 interface of UEFI configuration tables. (ACPI, SMBIOS, ...)
28 The implementation depends on receiving information about the UEFI environment
31 UEFI stub
33 The "stub" is a feature that extends the Image/zImage into a valid UEFI
35 load the kernel directly from the UEFI shell, boot menu, or one of the
39 booting in non-UEFI environments.
41 UEFI kernel support on ARM
43 UEFI kernel support on the ARM architectures (arm and arm64) is only available
46 When booting in UEFI mode, the stub deletes any memory nodes from a provided DT.
47 Instead, the kernel reads the UEFI memory map.
55 linux,uefi-system-table 64-bit Physical address of the UEFI System Table.
57 linux,uefi-mmap-start 64-bit Physical address of the UEFI memory map,
58 populated by the UEFI GetMemoryMap() call.
60 linux,uefi-mmap-size 32-bit Size in bytes of the UEFI memory map
63 linux,uefi-mmap-desc-size 32-bit Size in bytes of each entry in the UEFI
66 linux,uefi-mmap-desc-ver 32-bit Version of the mmap descriptor format.