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UEFI applications can be developed and installed independently of the original equipment manufacturers (OEMs). A type of UEFI application is an OS boot loader such as GRUB, rEFInd, Gummiboot, and Windows Boot Manager, which loads some OS files into memory and executes them. Also, an OS boot loader can provide a user interface to allow the ...
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] Even if UEFI Secure Boot is disabled this may be present and booted in case it is later enabled. It merely acts to add an extra signing key database providing keys for signature verification of subsequent ...
The SBL is now called XBL by Qualcomm and which is an UEFI implementation. Qualcomm uses LK (Little Kernel) plus Aboot, or XBL (eXtensible Bootloader) plus ABL; MediaTek uses Das U-Boot. [1] Little Kernel is a microkernel for embedded devices, which has been modified by Qualcomm to use it as a bootloader. [10]
UEFI (except for CSM boot) does not rely on boot sectors, it loads next-stage bootloader (such as BOOTMGR and GRUB2) from EFI System Partition directly. Embedded and multi-stage boot loaders [ edit ]
In IBM PC compatible computers, the main duties of POST are handled by the BIOS or UEFI, which may hand some of these duties to other programs designed to initialize very specific peripheral devices, notably for video and SCSI initialization.
When debugging a concurrent and distributed system of systems, a bootloop (also called boot loop or boot-loop) is a diagnostic condition of an erroneous state that occurs on computing devices; when those devices repeatedly fail to complete the booting process and restart before a boot sequence is finished, a restart might prevent a user from ...
When a system on a chip (SoC) enters suspend to RAM mode, in many cases, the processor is completely off while the RAM is put in self refresh mode. At resume, the boot ROM is executed again and many boot ROMs are able to detect that the SoC was in suspend to RAM and can resume by jumping directly to the kernel which then takes care of powering on again the peripherals which were off and ...
GNU-EFI and TianoCore are supported as main development platforms for writing binary UEFI applications in C to launch right from the rEFInd GUI menu. Typical purposes of an EFI application are fixing boot problems and programmatically modifying settings within UEFI environment, which would otherwise be performed from within the BIOS of a personal computer (PC) without UEFI.