index.md 3.3 KB
title: Linux guides x-toc-enable: true ...
NOTE: This guide pertains to x86 hosts, and does not cover supported CrOS/ARM chromebooks. For ARM targets, you should refer to u-boot documentation.
This page is useful for those who wish to use the GRUB GRUB payload directly. If you're using SeaBIOS, the boot process will work similarly to traditional BIOS systems; refer to the SeaBIOS documentation on https://seabios.org/SeaBIOS
Linux is generally assumed, especially for Libreboot development, but Libreboot also works quite nicely with BSD systems.
Useful links
Refer to the following pages:
- How to Prepare and Boot a USB Installer in libreboot Systems
- Modifying the GRUB Configuration in libreboot Systems
- How to Harden Your GRUB Configuration, for Security
Encrypted (LUKS/dm-crypt) installations
A better solution for encryption would be a Linux payload in flash, handling the encryption, at least if you want to use Linux, because then it'll have perfect LUKS support.
GRUB otherwise has good filesystem support, so if you have a valid grub.cfg
in /boot/grub on your installed system, Libreboot's GRUB configuration has
logic in it that will try to automatically use whatever you have installed,
by switching to it. In this way, most installations Just Work, so long as
the /boot partition is accessible.
Full encryption for basic LUKS2 is supported in libreboot. See the guide for more detail.
Rebooting system in case of freeze
Linux kernel has a feature to do actions to the system any time, even with it freezes, this is called a Magic SysRq keys. You can do these actions with Alt + Sysrq + Command. These are the actions:
- Alt + SysRq + B: Reboot the system
- Alt + SysRq + I: Send SIGKILL to every process except PID 1
- Alt + SysRq + O: Shut off the system
If some of them don't work, you have to enable it in the kernel
command line paramter. So append sysrq_always_enabled=1 to your
GRUB_CMDLINE_LINUX_DEFAULT in /etc/default/grub
You can also run # sysctl kernel.sysrq=1 to enable them.
Fedora won't boot?
This may also apply to CentOS or Redhat. Chroot guide can be found on fedora website
linux16 issue
Libreboot's default GRUB config sources fedora's grub config
grub.cfg (in /boot/grub2/grub.cfg), fedora by default makes use of the
linux16 command, where it should be saying linux
Do this in fedora:
Open /etc/grub.d/10_linux
Set the sixteenbit variable to an empty string, then run:
grub2-mkconfig -o /boot/grub2/grub.cfg
BLS issue
With newer versions of fedora,
scripts from grub package default to generating BLS
instead of grub.cfg. To change that behaviour add following line
to /etc/default/grub (or modify existing one if it already exists):
GRUB_ENABLE_BLSCFG=false
Then generate grub.cfg with:
grub2-mkconfig -o /boot/grub2/grub.cfg