Boot Time Kernel Options Linux

Some options were described in the first sections of this chapter.You can specify when you start Linux. There are many more options
can be specified. This section explores the ace of possibilities options
kernel and just describes some types, as well as any options you might have
want to use. The settings in this section affect most of the kernel and
therefore applies regardless of the loader used.

How can I choose a kernel during the booting process?

If you’ve installed three-part kernel images, you can use your awesome keyboard to choose which one the client wants your system to from. By default, the last kernel icon is selected. The splash screen actually waits a few seconds for the customer to make a selection. If not, then the main image “Non-Payment” is loaded.

If LILO is clearly your bootloader, you can apply or replace it
The option specified in /etc/lilo.conf when
Loading process in terms of:

When using GRUB, you must pass parameters to the kernel
a specific kernel command line, or
project file or through the command line interface. If you are
When booting from the GRUB menu, you can change or place options by typing
e or a until the menu appears.

Some launch options have already been mentioned. Big number
Others tend to be hardware dependent and are too numerous to mention here.
For a complete list of features and discussion of them, see this download.
see BootPrompt HOWTO. Someth parameters not shown
further, older ones that may be useful to someone are considered; a lot others
described in the HOWTO. Most of the following settings have been used
Give information or instructions to the kernel, not LILO
and also GRUB:

  • How can I choose a kernel during the booting process?

    If you have multiple kernel images installed, you can use your keyboard to choose which one your system will boot with. The latest kernel image is selected by default. Pop upits window will wait a few seconds until you select an option. If you don’t, our default kernel image will be loaded.

    If a prompt is set
    /etc/lilo.conf, LILO always talks about the boot process
    induces and waits for input. With Rapid you can choose them
    The operating system is trying to boot. By choosing Red Hat, you can also
    Show settings.

  • If no prompt is set, click
    Ctrl, Shift or Alt when the word “LILO” appears. Run command line
    so it’s really visible. You can also press the Scroll Lock button before LILO.
    But you also don’t have to wait on the keyboard to type.
    at the right time.

  • Motivate when booting, specify the system you want to boot, or
    Press the Tab key to get a list of available options. You can enter after that
    start an image business. For example:

    Start LILO: 
    linux test linux

    You winxp
    boot: You can also add boot options:

    boot: linux single
  • If they don’t enter anything, LILO waits in the wings
    fine in delay parameter
    then boots the failsafe OS with default settings
    Options are only defined in /etc/lilo.conf.


Disable ACPI (advanced configuration and power interface) if
It should be possible. It is possible to debug
Problems with the machine.


Print all kernel messages to this console.

hd=cylinders ,heads , sectors< /dt>

How do I find boot options in Linux?

If your wonderful computer uses BIOS to boot, hold down the Shift key while booting GRUB to try to enter the boot menu.
If your computer uses UEFI to boot, press Esc several times during GRUB boot to display the boot menu.

Specify the disk geometry to be used by the kernel. Useful if
Linux is worried about recognizing the geometry of the new disk,
mostly if it’s an IDE drive with more than 1024


Tell the kernel to select the RAM load to use for the disk you want to use.
when installing Linux. Values ​​with n


How does kernel work in boot time?

So, your kernel initializes devices, mounts the base filesystem specified by the bootloader, mainly because it is read-only, and starts init (/ sbin / init), which is the first process executed by the base system (PID = 1 ). ). The kernel generates an implication and the filesystem is mounted and followed by init when the boot process starts.

Don’t try to load the token. This is it
by default.


Load image directly from floppy to RAM


Specify the total amount of system memory attached. Useful ifand
Your BIOS does indeed report 64 MB of memory, and the human system has more.
Built-in memory. Also give a number with M or just k
(case sensitive) added:


How do you edit the kernel boot options in Linux?

Start the system and on the start screen of GRUB 2 move the cursor to the menu item you want to change and press the key to change.
Move your cursor down to find the kernel command queue.
Move the cursor to the end of the line.

Because mem will do
often exist on the command line to achieve each boot
specified in full on the command line and registered with Secure or Append to be added to options
passed to the specific kernel.


If set, disables the two-step boot process and therefore
The contents of /dev/initrd, so the new date
available after a recent kernel boot.
/dev/initrd is read-only from and after
its contents are returned to help the system.


Run Linux with the specified runlevel
Number. The runlevel is any good working state,
the system may be running, such as a specific multi-user system, or
The configuration of the system on which this X Window System is running. Runlevel
usually any number from one to 6; by defaultnii will probably be ok
five. On modern distributions using Upstart, your runlevels and their
The corresponding states are specified in ttyN.
Files in the /etc/event.d web directory. for more
Systems using SysVinit have specific runlevels defined in a file
/etc/inittab. See chapter 2 for
Discussion of its initialization process.

How do you edit the kernel boot options in Linux?

Boot your system and on the GRUB boot screen, move the cursor to Edit with the desired menu item and press the E key to edit.
Move the cursor down to find the kernel command line.
Move each cursor to the end of the line.

How does kernel work in boot time?

The BIOS of the machine, like the boot microcode, contains hundreds of them and starts the bootloader. The boot loader finds any kernel image on disk and/or loads it into memory to boot the system. The kernel necessarily initializes devices and their drivers. The kernel mounts the underlying file system.