GRUB

GRUB 2

Packages

Exherbo: sys-boot/grub

Gentoo: sys-boot/grub

/etc/portage/make.conf

GRUB_PLATFORMS="efi-64"

Installation

# mount /boot

# mount /boot/efi

# grub-install --efi-directory=/boot/efi --no-floppy --recheck

# efibootmgr

BootCurrent: 0001
BootOrder: 0004,0000,0001,0002,0003
Boot0000* EFI SCSI Hard Drive
Boot0001* EFI IDE CD/DVD Drive
Boot0002* EFI Network
Boot0003* EFI Internal Shell (Unsupported option)
Boot0004* exherbo

SET ACTIVE

# efibootmgr --bootnum 0004 --active

DELETE

# efibootmgr --bootnum 0004 --delete-bootnum

# efibootmgr

BootCurrent: 0001
BootOrder: 0000,0001,0002,0003
Boot0000* EFI SCSI Hard Drive
Boot0001* EFI IDE CD/DVD Drive
Boot0002* EFI Network
Boot0003* EFI Internal Shell (Unsupported option)

Standard, single drive GPT/MBR (SATA/IDE/SCSI)

# grub-install --recheck --no-floppy /dev/sda

Configuration

Note: Manual grub2 configuration should always happen in /etc/default/grub and /etc/grub.d/40_custom.

File: /etc/default/grub

GRUB_DISTRIBUTOR="Exherbo"
GRUB_DEFAULT="Exherbo GNU/Linux, current kernel"

Standard, single drive GPT (SATA/IDE/SCSI)

Code: Assuming following GPT partition layout

/dev/sda1 1 MiB EF02 BIOS boot BIOS boot partition /dev/sda2 100 MiB /boot 8300 ext4 Linux filesystem /dev/sda3 512 MiB 8200 swap Linux swap /dev/sda4 25 GiB / 8300 ext4 Linux filesystem

Generate grub.cfg

Warning: Running the following command will overwrite any changes in grub.cfg you manually made.

# grub-mkconfig -o /boot/grub/grub.cfg

# umount /boot

Optional: Additional Kernel Parameters

File: /etc/default/grub

GRUB_CMDLINE_LINUX="acpi=off"

Regenerate your grub.cfg for the changes to take effect.

Optional: Theme

File: /etc/default/grub

GRUB_THEME=/boot/efi/EFI/grub/themes/starfield/theme.txt
GRUB_TERMINAL_OUTPUT=gfxterm

If your display resolutions isn't automatically detected you can manually force a specific resolution.

File: /etc/default/grub

GRUB_GFXMODE=1600x1200

Regenerate your grub.cfg for the changes to take effect.

Optional: Serial Console

File: /etc/default/grub

GRUB_TERMINAL=serial
GRUB_SERIAL=COMMAND="serial --unit=0 --speed=57600 --word=8 --parity=no --stop=1"
GRUB_CMDLINE_LINUX_DEFAULT="console=tty0 console=ttyS0,57600"

Regenerate your grub.cfg for the changes to take effect.

If you want to be able to login to your system via the serial console you need to edit /etc/inittab.

File: /etc/inittab

Uncomment the s0 entry and change the speed to your needs.

# SERIAL CONSOLES
s0:12345:respawn:/sbin/agetty 57600 ttyS0 vt100
#s1:12345:respawn:/sbin/agetty 9600 ttyS1 vt100