Bootloaders: Difference between revisions
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Alpine ships with a script called <code>update-extlinux</code> which automatically (re)generates this file, for example on updates to Syslinux. | Alpine ships with a script called <code>update-extlinux</code> which automatically (re)generates this file, for example on updates to Syslinux. | ||
The settings for this script can be found in <code>/etc/update-extlinux.conf</code>, including the option to disable automatic overwriting of <code>/boot/extlinux.conf</code>. | The settings for this script can be found in <code>/etc/update-extlinux.conf</code>, including the option to disable automatic overwriting of <code>/boot/extlinux.conf</code>. | ||
You can also place additional menu entries in the <code>/etc/update-extlinux.d/</code> directory, e.g. for dual | You can also place additional menu entries in the <code>/etc/update-extlinux.d/</code> directory, e.g. for dual booting. | ||
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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). | ||
= Installing GRUB = | = Installing GRUB = | ||
Revision as of 06:37, 20 December 2017
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).
Installing 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
Next install the MBR and GRUB binaries to disk:
grub-install /dev/vda
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.