![]() If the NVRAM contains no such entries or if they're all invalid, recent EFI implementations default to using a boot loader of the form \EFI\BOOT\boot is an architecture code, such as "圆4" for x86-64 or "ia32" for x86.Īll EFI executable images contain a PE/COFF header defining the format of the executable code. These variables can be manipulated in Linux with the efibootmgr utility. The boot order is maintained in the BootOrder variable. ![]() More commonly, a list of boot loaders is maintained in NVRAM variables called Boot#, where # is a hexadecimal number. startup.nsh can be used to load and execute the preferred boot loader. It will execute the boot script called startup.nsh found in the root of an ESP. This boot partition should probably be mounted on a Linux system as /boot/efi for the updating of new kernels and initrd images.Įach vendor "must" use a dedicated directory in \EFI\vendor for the. The ESP is effectively the boot partition, and contains the necessary images to boot a system. Note that there can be one or more system partions. Loading of kernel initrd occurs using EFI firmware, hence only supports FAT16/32 (but if given 3rd-party EFI drivers can then read: ext2, ext3, ext4, ReiserFS, Btrfs, HFS , or ISO-9660) ( 3)Īll EFI compliant systems have an EFI System Partition (ESP), which is a FAT32 partition containing EFI firmware modules and boot images. ![]() root=/dev/nfs ip=%I:%z:%G:%N, where the utility can generate the needed values based on information it can probe for ( 1) Linux kernels since v3.3.0 are bootable via system firmware no bootloader neededĮFI graphical boot manager, development stopped in 2010ĮFI graphical boot manager with OS auto-detection, semi-active developmentĮFI text-menu boot manager with modern features but very simple interface, actively developedĮ.g. Most complex Linux EFI bootloader available, actively developed Oldest/most stable Linux EFI bootloader, very limited features
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