From Gummiboot homepage:
- Gummiboot is a simple UEFI boot manager which executes configured EFI images. The default entry is selected by a configured pattern (glob) or an on-screen menu.
It is simple to configure, but can only start EFI executables, the Linux kernel EFISTUB, UEFI Shell, grub.efi, and such.
Installand install gummiboot in ESP:
# mount -t efivarfs efivarfs /sys/firmware/efi/efivars # required even inside chroot if any, ignore if already mounted # pacman -S gummiboot # gummiboot --path=$esp install
This will automatically copy the gummiboot binary to your EFI System Partition and create a boot entry in the EFI Boot Manager. If you are not booted via EFI, creating the boot entry will fail. You should however still be able to boot gummiboot as it copies the binary to the default EFI binary location on your ESP (
$esp/EFI/boot/bootx64.efi on x64 systems) (unless a non-gummiboot
$esp/EFI/boot/bootx64.efi is already present).
Gummiboot assumes that your EFI System Partition is mounted on
/boot. If the ESP is not mounted on
/boot, gummiboot will not be updated automatically during pkg updates and you will have to call
gummiboot --path=$esp update after every package update. Additionally you will have to make sure that the kernel and initramfs are copied onto the ESP as gummiboot cannot load EFI binaries from other partitions. It is therefore strongly recommended to mount your ESP to
/boot if you use gummiboot, in which case updating will happen automatically by the
post_install script of during package updates.
The basic configuration is kept in
$esp/loader/loader.conf, with just two possible configuration options:
default– default entry to select (without the
.confsuffix); can be a wildcard like
timeout– menu timeout in seconds. If this is not set, the menu will only be shown when you hold the space key while booting.
default arch timeout 4
Note that both options can be changed in the boot menu itself, which will store them as EFI variables.
Adding boot entries
Gummiboot searches for boot menu items in
$esp/loader/entries/*.conf – each file found must contain exactly one boot entry. The possible options are:
title– operating system name. Required.
version– kernel version, shown only when multiple entries with same title exist. Optional.
machine-id– machine identifier from
/etc/machine-id, shown only when multiple entries with same title and version exist. Optional.
efi– EFI program to start, relative to your ESP (
/vmlinuz-linux. Either this or
linux(see below) is required.
options– Command-line options to pass to the EFI program. Optional, but you will need at least
root=devif booting Linux.
For Linux, you can specify
linux path-to-vmlinuz and
initrd path-to-initramfs; this will be automatically translated to
efi path and
options initrd=path – this syntax is only supported for convenience and has no differences in function.
You can find your PARTUUID with
blkid -s PARTUUID -o value /dev/sdxx
An example entry for Arch Linux:
title Arch Linux linux /vmlinuz-linux initrd /initramfs-linux.img options root=PARTUUID=14420948-2cea-4de7-b042-40f67c618660 rw
Please note in the example above that PARTUUID/PARTLABEL identifies a GPT partition, and differs from UUID/LABEL, which identifies a filesystem. Using the PARTUUID/PARTLABEL is advantageous because it is invariant if you reformat the partition with another filesystem. It is also useful if you do not have a filesystem on the partition (or use LUKS, which does not support LABELs).
An example entry for encrypted root (dm-crypt with LUKS)
title Arch Linux (Encrypted) linux /path/to/vmlinuz-linux options initrd=/path/to/initramfs-linux.img cryptdevice=UUID=<UUID>:luks-<UUID> root=UUID=<luks-UUID> rw
In the encrypted example, not that the initrd is in options -- this does not appear to be discretionary at this time. Note that UUID is used for in this example. PARTUUID should be able to replace the UUID, if so desired.
You can also add other EFI programs such as
The following keys are used inside the menu:
Up/Down- select entry
Enter- boot the selected entry
d- select the default entry to boot (stored in a non-volatile EFI variable)
-/T- decrease the timeout (stored in a non-volatile EFI variable)
+/t- increase the timeout (stored in a non-volatile EFI variable)
e- edit the kernel command line
v- show the gummiboot and UEFI version
P- print the current configuration
These hotkeys will, when pressed inside the menu or during bootup, directly boot a specific entry:
a- OS X
s- EFI Shell
1-9- number of entry
Manual entry using efibootmgr
gummiboot install command failed, you can create a EFI boot entry manually using
# efibootmgr -c -d /dev/sdX -p Y -l /EFI/gummiboot/gummibootx64.efi -L "Gummiboot"
/dev/sdXY is the EFISYS partition.
Menu does not appear after Windows upgrade
For example, if you upgraded from Windows 8 to Windows 8.1, and you no longer see a boot menu after the upgrade (i.e., Windows boots immediately):
- Make sure Secure Boot (BIOS setting) and Fast Startup (Windows power option setting) are both disabled.
- Make sure your BIOS prefers Linux Boot Manager over Windows Boot Manager (depending on your BIOS, this might appear under a BIOS setting like Hard Disk Drive Priority).