103 lines
4.0 KiB
Markdown
103 lines
4.0 KiB
Markdown
---
|
|
title: GNU+Linux guides
|
|
x-toc-enable: true
|
|
...
|
|
|
|
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>
|
|
|
|
GNU+Linux is the operating system of choice, for Libreboot development. It is
|
|
highly recommended over any other operating system, precisely because it consists
|
|
of [Free Software](https://www.gnu.org/philosophy/free-sw.html) (free as in
|
|
freedom). There *are* other free operating systems, such as BSD, but most of
|
|
the software in a typical GNU+Linux system is also *copylefted*. To learn more
|
|
about the importance of copyleft, read this page on the GNU website:
|
|
<https://www.gnu.org/licenses/copyleft.html>
|
|
|
|
Useful links
|
|
============
|
|
|
|
Refer to the following pages:
|
|
|
|
* [How to Prepare and Boot a USB Installer in Libreboot Systems](grub_boot_installer.md)
|
|
* [Modifying the GRUB Configuration in Libreboot Systems](grub_cbfs.md)
|
|
* [Installing Hyperbola GNU+Linux, with Full-Disk Encryption (including /boot)](https://wiki.hyperbola.info/en:guide:encrypted_installation)
|
|
* [Installing Debian or Devuan GNU+Linux-Libre, with Full-Disk Encryption (including /boot)](encrypted_debian.md)
|
|
* [How to Harden Your GRUB Configuration, for Security](grub_hardening.md)
|
|
|
|
Guix, Parabola, Trisquel
|
|
========================
|
|
|
|
These guides were outdated, so they were deleted. You can find links to them
|
|
here: <https://notabug.org/libreboot/lbwww/issues/4>
|
|
|
|
The above issue page is the same as this entry on the TODO page:
|
|
[../../tasks/#move-all-distro-fdeboot-guides-to-distro-wikimanuals](../../tasks/#move-all-distro-fdeboot-guides-to-distro-wikimanuals)
|
|
|
|
The Debian guide has been retained, because it's currently up to date. The
|
|
Hyperbola guide is already on the Hyperbola website, and the above is just a
|
|
link.
|
|
|
|
In general, it is recommended that you use SeaBIOS but if you want extra security,
|
|
GRUB payload is recommended where you can then have a fully encrypted /boot
|
|
directory.
|
|
|
|
TODO: Nuke *all* distro-specific guides on libreboot.org. Instead, move these
|
|
instructions to the wiki pages of these projects, on their websites. The reasons
|
|
are explained in the above issue page.
|
|
|
|
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](https://en.wikipedia.org/wiki/Reisub). 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](https://docs.fedoraproject.org/en-US/quick-docs/bootloading-with-grub2/#restoring-bootloader-using-live-disk)
|
|
|
|
linux16 issue
|
|
-------------
|
|
|
|
When you use Libreboot's default GRUB config, and libreboot's grub uses fedora's
|
|
default `grub.cfg` (in `/boot/grub2/grub.cfg`), fedora by default makes use of the
|
|
`linux16` command, whereas 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](https://fedoraproject.org/wiki/Changes/BootLoaderSpecByDefault),
|
|
scripts from grub package default to generating [BLS](https://www.freedesktop.org/wiki/Specifications/BootLoaderSpec/)
|
|
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
|