NAME

       systemd-boot, sd-boot - A simple UEFI boot manager

DESCRIPTION

       systemd-boot (short: sd-boot) is a simple UEFI boot manager. It provides a graphical menu
       to select the entry to boot and an editor for the kernel command line. systemd-boot
       supports systems with UEFI firmware only.

       systemd-boot loads boot entry information from the EFI system partition (ESP), usually
       mounted at /boot, /efi, or /boot/efi during OS runtime. Configuration file fragments,
       kernels, initrds and other EFI images to boot generally need to reside on the ESP. Linux
       kernels must be built with CONFIG_EFI_STUB to be able to be directly executed as an EFI
       image. During boot systemd-boot automatically assembles a list of boot entries from the
       following sources:

       ·   Boot entries defined with Boot Loader Specification[1] description files located in
           /loader/entries/ on the ESP. These usually describe Linux kernel images with
           associated initrd images, but alternatively may also describe arbitrary other EFI
           executables.

       ·   Unified kernel images following the Boot Loader Specification[1], as executable EFI
           binaries in /EFI/Linux/ on the ESP.

       ·   The Microsoft Windows EFI boot manager, if installed

       ·   The Apple MacOS X boot manager, if installed

       ·   The EFI Shell binary, if installed

       ·   A reboot into the UEFI firmware setup option, if supported by the firmware

       kernel-install(8) may be used to copy kernel images onto the ESP and to generate
       description files compliant with the Boot Loader Specification.  bootctl(1) may be used
       from a running system to locate the ESP, list available entries, and install systemd-boot
       itself.

       systemd-boot will provide information about the time spent in UEFI firmware using the Boot
       Loader Interface[2]. This information can be displayed using systemd-analyze(1).

KEY BINDINGS

       The following keys may be used in the boot menu:

       ↑ (Up), ↓ (Down), j, k, PageUp, PageDown, Home, End
           Navigate up/down in the entry list

       ↵ (Enter)
           Boot selected entry

       d
           Make selected entry the default

       e
           Edit the kernel command line for selected entry

       +, t
           Increase the timeout before default entry is booted

       -, T
           Decrease the timeout

       v
           Show systemd-boot, UEFI, and firmware versions

       P
           Print status

       Q
           Quit

       h, ?
           Show a help screen

       Ctrl + l
           Reprint the screen

       The following keys may be used during bootup or in the boot menu to directly boot a
       specific entry:

       l
           Linux

       w
           Windows

       a
           OS X

       s
           EFI shell

       1, 2, 3, 4, 5, 6, 7, 8, 9
           Boot entry number 1 ... 9

       In the editor, most keys simply insert themselves, but the following keys may be used to
       perform additional actions:

       ← (Left), → (Right), Home, End
           Navigate left/right

       Esc
           Abort the edit and quit the editor

       Ctrl + k
           Clear the command line

       Ctrl + w, Alt + Backspace
           Delete word backwards

       Alt + d
           Delete word forwards

       ↵ (Enter)
           Boot entry with the edited command line

       Note that unless configured otherwise in the UEFI firmware, systemd-boot will use the US
       keyboard layout, so key labels might not match for keys like +/-.

FILES

       The files systemd-boot reads generally reside on the UEFI ESP which is usually mounted to
       /boot/, /efi/ or /boot/efi during OS runtime. systemd-boot reads runtime configuration
       such as the boot timeout and default entry from /loader/loader.conf on the ESP (in
       combination with data read from EFI variables). See loader.conf(5). Boot entry description
       files following the Boot Loader Specification[1] are read from /loader/entries/ on the
       ESP. Unified kernel boot entries following the Boot Loader Specification[1] are read from
       /EFI/Linux/ on the ESP.

SEE ALSO

       bootctl(1), loader.conf(5), Boot Loader Specification[1], Boot Loader Interface[2]

NOTES

        1. Boot Loader Specification
           https://github.com/systemd/systemd/blob/master/doc/BOOT_LOADER_SPECIFICATION.md

        2. Boot Loader Interface
           https://www.freedesktop.org/wiki/Software/systemd/BootLoaderInterface