Difference between revisions of "Systemd-boot"
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[[Category:Boot loaders]] | [[Category:Boot loaders]] | ||
[[ja:Gummiboot]] | [[ja:Gummiboot]] | ||
− | [http://freedesktop.org/wiki/Software/gummiboot Gummiboot] is a UEFI boot | + | [http://freedesktop.org/wiki/Software/gummiboot Gummiboot] is a UEFI boot loader written by Kay Sievers and Harald Hoyer. It is simple to configure, but can only start EFI executables, the Linux kernel [[EFISTUB]], UEFI Shell, grub.efi, and such. |
{{Warning|Gummiboot simply provides a boot menu for EFISTUB kernels. In case you have issues booting EFISTUB kernels like in {{Bug|33745}}, you should use a boot loader which does not use EFISTUB, like [[GRUB]], [[Syslinux]] or [[Bootloaders#ELILO|ELILO]].}} | {{Warning|Gummiboot simply provides a boot menu for EFISTUB kernels. In case you have issues booting EFISTUB kernels like in {{Bug|33745}}, you should use a boot loader which does not use EFISTUB, like [[GRUB]], [[Syslinux]] or [[Bootloaders#ELILO|ELILO]].}} |
Revision as of 16:57, 5 February 2014
Gummiboot is a UEFI boot loader written by Kay Sievers and Harald Hoyer. It is simple to configure, but can only start EFI executables, the Linux kernel EFISTUB, UEFI Shell, grub.efi, and such.
$esp
denotes the mountpoint of the EFI System Partition aka ESP.Contents
Installation
Install gummiboot and install gummiboot in ESP:
# mount -t efivarfs efivarfs /sys/firmware/efi/efivars # required even inside chroot if any, ignore if already mounted # pacman -S gummiboot # gummiboot --path=$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 $esp/EFI/boot/bootx64.efi
is already present).
- The gummiboot command by default assumes that your EFI System Partition is mounted on
/boot
. This means gummiboot in the ESP will not be updated automatically during pkg updates and you will have to callgummiboot --path=$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 gummiboot during package updates.
- If
gummiboot
fails to create a boot entry, check whether all the conditions mentioned here are met.
Configuration
Basic Configuration
The basic configuration is kept in $esp/loader/loader.conf
, with just two possible configuration options:
default
– default entry to select (without the.conf
suffix); can be a wildcard likearch-*
timeout
– menu timeout in seconds. If this is not set, the menu will only be shown when you hold the space key while booting.
Example:
$esp/loader/loader.conf
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 $esp/loader/entries/*.conf
– each file found must contain exactly one boot entry. The possible options are:
title
– operating system name. Required.
version
– kernel version, shown only when multiple entries with same title exist. Optional.
machine-id
– machine identifier from/etc/machine-id
, shown only when multiple entries with same title and version exist. Optional.
efi
– EFI program to start, relative to your ESP ($esp
); e.g./vmlinuz-linux
. Either this orlinux
(see below) is required.
options
– Command-line options to pass to the EFI program. Optional, but you will need at leastinitrd=efipath
androot=dev
if 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.
An example entry for Arch Linux:
$esp/loader/entries/arch.conf
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)
$esp/loader/entries/arch-encrypted.conf
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 \EFI\arch\grub.efi
.
\EFI\Microsoft\Boot\Bootmgfw.efi
), "EFI Shell" (\shellx64.efi
) and "EFI Default Loader" (\EFI\Boot\bootx64.efi
), and display entries for them if they are present, so you do not have to manually create entries for them. However it does not autodetect other EFI applications (unlike rEFInd), so for booting the kernel, manual config entries must be created as mentioned above.Keys
The following keys are used inside the menu:
Up/Down
- select entryEnter
- boot the selected entryd
- 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 linev
- show the gummiboot and UEFI versionQ
- quitP
- print the current configurationh/?
- help
These hotkeys will, when pressed inside the menu or during bootup, directly boot a specific entry:
l
- Linuxw
- Windowsa
- OS Xs
- EFI Shell1-9
- number of entry
Troubleshooting
Manual entry using efibootmgr
If gummiboot install
command failed, you can create a EFI boot entry manually using efibootmgr
utility:
# efibootmgr -c -d /dev/sdX -p Y -l /EFI/gummiboot/gummibootx64.efi -L "Gummiboot"
where /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).