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docs/linux: note about GRUB_TERMINAL in distros 

Signed-off-by: Leah Rowe <leah@libreboot.org>
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Leah Rowe 2023-09-02 18:28:00 +01:00
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@ -23,6 +23,32 @@ Refer to the following pages:
* [Modifying the GRUB Configuration in libreboot Systems](grub_cbfs.md)
* [How to Harden Your GRUB Configuration, for Security](grub_hardening.md)
NOTE ABOUT VGA MODES and GRUB
=============================
Libreboot does not support switching VGA modes, when coreboot's libgfxinit is
used on Intel GPUs. Many distros will install GRUB, which Libreboot then finds
and executes, if running SeaBIOS payload; if using GRUB, just the distro's
grub.cfg file is loaded instead, by Libreboot's own GRUB in flash.
Libreboot GRUB boots in text mode or uses the coreboot framebuffer. Anyway,
set `GRUB_TERMINAL=console` in GRUB and you should be fine. This avoids GRUB,
the one provided by your distro, switching video modes.
In Debian for example (steps largely the same on other distros):
Edit `/etc/default/` as root, and uncomment or add the line:
GRUB_TERMINAL=console
Then still as root, do these commands:
export PATH="$PATH:/sbin"
update-grub
Now your distro's GRUB menu should work, when your distro's GRUB bootloader is
executed from Libreboot's SeaBIOS payload.
Encrypted (LUKS/dm-crypt) installations
=======================================