Bootloaders: Difference between revisions
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You may need to modify <code>/mnt/EFI/syslinux/syslinux.cfg</code> to change the paths to absolute paths (just add a / in front of the vmlinuz/initramfs entries), | You may need to modify <code>/mnt/EFI/syslinux/syslinux.cfg</code> to change the paths to absolute paths (just add a / in front of the vmlinuz/initramfs entries), | ||
or copy the files to <code>/mnt/EFI/syslinux</code> instead (XXX: untested). | or copy the files to <code>/mnt/EFI/syslinux</code> instead (XXX: untested). | ||
= GRUB = | = GRUB = |
Revision as of 19:08, 31 January 2020
By default Alpine uses Syslinux as bootloader. This page shows the basic steps you need to perform, if you for any reason want to switch bootloaders or apply some manual configuration.
Installing Syslinux
If you want to switch from another bootloader back to Syslinux, or if you for some reason want to install Syslinux manually, the following steps are required.
Install the syslinux
package:
apk add syslinux
If you're using GPT partitions, install the GPT MBR onto the drive you want to install the bootloader on (in this case /dev/sda
):
dd bs=440 count=1 conv=notrunc if=/usr/share/syslinux/gptmbr.bin of=/dev/sda
Or if you're using DOS partitions, install the DOS MBR instead:
dd bs=440 count=1 conv=notrunc if=/usr/share/syslinux/mbr.bin of=/dev/sda
Next install the required Syslinux binaries. Despite being called extlinux
, Syslinux supports booting from FAT12/16/32, NTFS, ext2/3/4, Btrfs, XFS, and UFS/FFS filesystems.
extlinux --install /boot
The configuration file is located in /boot/extlinux.conf
.
Alpine ships with a script called update-extlinux
which automatically (re)generates this file, for example on updates to Syslinux.
The settings for this script can be found in /etc/update-extlinux.conf
, including the option to disable automatic overwriting of /boot/extlinux.conf
.
You can also place additional menu entries in the /etc/update-extlinux.d/
directory, e.g. for dual booting.
EFI
Assuming /mnt
is a FAT32 partition of type EF00 and /boot
belongs to the rootfs created after running setup-disk
:
mkdir -p /mnt/EFI/syslinux cp /usr/share/syslinux/efi64/* /mnt/EFI/syslinux/ cp /boot/extlinux.conf /mnt/EFI/syslinux/syslinux.cfg cp /boot/vmlinuz* /mnt/ cp /boot/initramfs* /mnt/
You may need to modify /mnt/EFI/syslinux/syslinux.cfg
to change the paths to absolute paths (just add a / in front of the vmlinuz/initramfs entries),
or copy the files to /mnt/EFI/syslinux
instead (XXX: untested).
GRUB
To install GRUB in BIOS mode, (optionally) remove the Syslinux package and install the required GRUB packages:
apk del syslinux apk add grub grub-bios
For EFI, install Grub's EFI package instead. Note that /boot
has to be an EFI compatible filesystem like FAT32.
apk add grub-efi
Next install the MBR and GRUB binaries to disk for BIOS mode:
grub-install /dev/vda
For EFI mode:
grub-install --target=x86_64-efi --efi-directory=/boot
GRUB ships with an automatic config generator, including some automatic detection of other operating systems installed on the device:
grub-mkconfig -o /boot/grub/grub.cfg
This script can be configured via the /etc/default/grub
file.
See [1] for a list of available options.