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UEFI requires the firmware and operating system loader (or kernel) to be size-matched; that is, a 64-bit UEFI firmware implementation can load only a 64-bit operating system (OS) boot loader or kernel (unless the CSM-based legacy boot is used) and the same applies to 32-bit.
GRUB 2, elilo and systemd-boot serve as conventional, full-fledged standalone UEFI boot managers (a.k.a. bootloader managers) for Linux. Once loaded by a UEFI firmware, they can access and boot kernel images from all devices, partitions and file systems they support, without being limited to the EFI system partition.
The GUID Partition Table is specified in chapter 5 of the UEFI 2.8 specification. [2] GPT uses 64 bits for logical block addresses, allowing a maximum disk size of 2 64 sectors. For disks with 512‑byte sectors, the maximum size is 8 ZiB (2 64 × 512‑bytes) or 9.44 ZB (9.44 × 10²¹ bytes). [ 1 ]
U-Boot implements a subset of the UEFI specification as defined in the Embedded Base Boot Requirements (EBBR) specification. [6] UEFI binaries like GRUB or the Linux kernel can be booted via the boot manager or from the command-line interface. U-Boot runs a command-line interface on a console or a serial port. Using the CLI, users can load and ...
In UEFI systems, the Linux kernel can be executed directly by UEFI firmware via the EFI boot stub, [8] but usually uses GRUB 2 or systemd-boot as a bootloader. [9] [10] If UEFI Secure Boot is supported, a "shim" or "Preloader" is often booted by the UEFI before the bootloader or EFI-stub-bearing kernel. [11]
The Platform Initialization Specification (PI Specification) is a specification published by the Unified EFI Forum that describes the internal interfaces between different parts of computer platform firmware. [1]
The 64-bit operating system kernel checks and switches the CPU into Long mode and then starts new kernel-mode threads running 64-bit code. With a computer running UEFI, the UEFI firmware (except CSM and legacy Option ROM), the UEFI boot loader and the UEFI operating system kernel all run in Long mode.
Property label has string type, property erase-block has integer type and property reg is an array of integers (32-bit unsigned values). Property values can refer to other nodes in the devicetree by their phandles. Phandle for a node with label flash0 would be written as &flash0. Phandles are also 32-bit values.