Kernel parameters

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Revision as of 09:52, 20 July 2012 by Det (Talk | contribs) (GRUB Legacy)

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There are three ways to pass options to the kernel and thus control its behavior:

  • When building the kernel.
  • When starting the kernel. Usually, parameters are passed to the kernel when it is invoked from a boot loader.
  • At runtime, by writing to files in the proc and /sys directories.

This page will explain the second method and show a list of most used kernel parameters in Arch Linux. For a complete list of all known options, please see the kernel documentation.

Configuration

Here we are adding the parameters quiet and splash to GRUB, GRUB Legacy, LILO and Syslinux.

GRUB

Edit the file /etc/default/grub and append your kernel options to the line GRUB_CMDLINE_LINUX_DEFAULT="":

/etc/default/grub
GRUB_CMDLINE_LINUX_DEFAULT="ro quiet splash"

Re-generate grub.cfg with:

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

The resulting line in /boot/grub/grub.cfg will look like:

/boot/grub/grub.cfg
linux	/vmlinuz-linux root=/dev/sda3 quiet splash

GRUB Legacy

For GRUB Legacy the kernel parameters go into the kernel line of menu.lst.

/boot/grub/menu.lst
kernel /vmlinuz-linux root=/dev/sda3 ro quiet splash

LILO

/etc/lilo.conf
image=/boot/vmlinuz-linux
        [...]
        quiet splash

Syslinux

/boot/syslinux/syslinux.cfg
APPEND root=UUID=988d4e11-8237-4af3-5ab6-77627128g9d0 ro vga=current quiet splash

Parameters list

Note: Not all of the listed options are always available. Most are associated with subsystems and work only if the kernel is configured with those subsystems build in. They also depend on the presence of the hardware with which they are associated.

All of these parameters are case-sensitive.

Tango-document-new.pngThis article is a stub.Tango-document-new.png

Notes: Add list here. (Discuss in Talk:Kernel parameters#)

See Also