OVMF (Open Virtual Machine Firmware) is a build of edk2 designed to be used as firmware for a virtual machine. Tianocore is the name of the upstream development group working on the Open Source EDK II project - see for more information. The reference implementation of the UEFI specifications is called edk2 or EDK II (EFI Development Kit, version 2). UEFI is actually a set of interface specifications, nothing more. There are multiple further bits of terminology here, and things are often confused. In most references here and elsewhere on the net, EFI and UEFI are interchangeable terms to describe the same thing. The U for Unified was added to the name at this point. Later, Intel passed control over the EFI specification to the UEFI Forum and they continued developing newer versions of the specification. It was first seen in the wild on Itanium (ia64) machines and that's where Debian's first support started too. UEFI started life as Intel's EFI specification. See Grub2#UEFI_vs_BIOS_boot for a comparison of BIOS and UEFI boot via GRUB, the default bootloader in Debian. It's a standard specification for the firmware interface on a computer, and it has been implemented by multiple vendors on various platforms. (U)EFI stands for (Unified) Extensible Firmware Interface.
Firmware has run out of space to write boot variables.grub-install unable to set up boot variables.Could not read EFI vars under RT kernel.
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How to reinstall the grub-efi bootloader on Debian.Support for mixed-mode systems: 64-bit system with 32-bit UEFI.Force grub-efi installation to the removable media path.Dual-booting systems currently installed using BIOS fallback boot.Quirks, workarounds and special UEFI features in Debian and Debian-Installer.efibootmgr example 3 - add a new boot entry.efibootmgr example 2 - verbose display of boot entries.efibootmgr example 1 - display boot entries.ARM32 platform: UEFI, U-Boot, Fastboot, etc.ARM64 platform: UEFI, U-Boot, Fastboot, etc.
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