GRUB
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Documentation
Official documentation:
https://www.gnu.org/software/grub/
http://www.gnu.org/software/grub/manual/
https://en.wikipedia.org/wiki/GNU_GRUB
See also (e.g. in Konqueror):
info:grub
Ubuntu: https://help.ubuntu.com/community/Grub2
Gentoo: https://wiki.gentoo.org/wiki/Grub2
Illustrated dual boot:
http://members.iinet.net/~herman546/index.html
Grub:
http://members.iinet.net/~herman546/p20.html
GRUB 2 bootloader - Full tutorial
http://www.dedoimedo.com/computers/grub-2.html
Gentoo:
https://wiki.gentoo.org/wiki/GRUB2
https://wiki.gentoo.org/wiki/GRUB2_Quick_Start
https://wiki.gentoo.org/wiki/Handbook:AMD64/Installation/Bootloader
Files
Configuration files:
- http://linux.overshoot.tv/etc/grub.d
- /etc/default/grub
Notes
The official documentation is complete, but not very clear on certain points. Help us clarify them here. Hopefully, some of the clarifications here will eventually make their way into the official, upstream documentation.
menuentry
For a Linux distribution installation, what would the required elements of a menuentry be?
menuentry "03- Gentoo Base System release 2.2 (on GPT drive)" --class gnu-linux --class gnu --class os {
insmod ext2
insmod part_gpt
search --set=root --no-floppy --fs-uuid 992fd876-0472-4b49-98e0-802159049d57
linux /boot/kernel-genkernel-x86_64-4.4.21-gentoo root=UUID=992fd876-0472-4b49-98e0-802159049d57
initrd /boot/initramfs-genkernel-x86_64-4.4.21-gentoo
}
'root' is mentioned twice in the above entry.
The first time ("search --set=root...") is to tell grub which partition to boot. Here, it is set to search for the proper partition by UUID.
The second time is the 'root' parameter that the linux kernel expects. Similarly, we set it with the partition's UUID. Beware, the UUID only works with initramfs or initrd kernels.
Questions to be answered:
'insmod' loads grub modules. What is the list of such modules, and which ones to load, when?
GRUB_GFXMODE
Find your screen resolution:
http://linux.overshoot.tv/wiki/monitor
$ xdpyinfo | grep 'dimensions:'
dimensions: 1920x1080 pixels (508x285 millimeters)
with package: http://linux.overshoot.tv/x11-apps/xdpyinfo
Find the colour depth:
# xwininfo -root | grep Depth
Depth: 24
With package x11-apps/xwininfo
Use the above information to set GRUB_GFXMODE in /etc/default/grub:
# The resolution and colour depth used on graphical terminal.
# Note that you can use only modes which your graphic card supports via VBE.
# You can see them in real GRUB with the command `vbeinfo'.
GRUB_GFXMODE=1920x1080x24
Theming
See also;
http://linux.overshoot.tv/wiki/plymouth
See also
Grub2 theme tutorial
http://wiki.rosalab.ru/en/index.php/Grub2_theme_tutorial
Issues related to this page:
Project | Summary | Status | Priority | Category | Last updated | Assigned to |
---|---|---|---|---|---|---|
Linux software | Configure grub for dual boot | active | critical | support request | 13 years 4 weeks | |
Linux software | Easy selection of menu entry for grub-reboot | active | normal | feature request | 10 years 7 weeks |