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This file lists the possible command line options that can be used to tweak
the boot process of this CD. This lists the Gentoo-specific options, along
with a few options that are built-in to the kernel, but that have been proven
very useful to our users. Also, all options that start with "do" have a "no"
inverse, that does the opposite. For example, "doscsi" enables SCSI support
in the initial ramdisk boot, while "noscsi" disables it.
Hardware options:
acpi=on This loads support for ACPI and also causes the acpid daemon to
be started by the CD on boot. This is only needed if your
system requires ACPI to function properly. This is not required
for Hyperthreading support.
acpi=off Completely disables ACPI. This is useful on some older systems,
and is also a requirement for using APM. This will disable any
Hyperthreading support of your processor.
console=X This sets up serial console access for the CD. The first
option is the device, usually ttyS0 on x86, followed by any
connection options, which are comma separated. The default
options are 9600,8,n,1.
dmraid=X This allows for passing options to the device-mapper RAID
subsystem. Options should be encapsulated in quotes.
doapm This loads APM driver support. This requires you to also use
acpi=off.
dopcmcia This loads support for PCMCIA and Cardbus hardware and also
causes the pcmcia cardmgr to be started by the CD on boot.
This is only required when booting from a PCMCIA/Cardbus device.
doscsi This loads support for most SCSI controllers. This is also a
requirement for booting most USB devices, as they use the SCSI
subsystem of the kernel.
hda=stroke This allows you to partition the whole hard disk even when your
BIOS is unable to handle large disks. This option is only used
on machines with an older BIOS. Replace hda with the device
that is requiring this option.
ide=nodma This forces the disabling of DMA in the kernel and is required
by some IDE chipsets and also by some CDROM drives. If your
system is having trouble reading from your IDE CDROM, try this
option. This also disables the default hdparm settings from
being executed.
noapic This disables the Advanced Programmable Interrupt Controller
that is present on newer motherboards. It has been known to
cause some problems on older hardware.
nodetect This disables all of the autodetection done by the CD, including
device autodetection and DHCP probing. This is useful for doing
debugging of a failing CD or driver.
nodhcp This disables DHCP probing on detected network cards. This is
useful on networks with only static addresses.
nodmraid Disables support for device-mapper RAID, such as that used for
on-board IDE/SATA RAID controllers.
nofirewire This disables the loading of Firewire modules. This should only
be necessary if your Firewire hardware is causing a problem with
booting the CD.
nogpm This diables gpm console mouse support.
nohotplug This disables the loading of the hotplug and coldplug init
scripts at boot. This is useful for doing debugging of a
failing CD or driver.
nokeymap This disables the keymap selection used to select non-US
keyboard layouts.
nolapic This disables the local APIC on Uniprocessor kernels.
nosata This disables the loading of Serial ATA modules. This is useful
if your system is having problems with the SATA subsystem.
nosmp This disables SMP, or Symmetric Multiprocessing, on SMP-enabled
kernels. This is useful for debugging SMP-related issues with
certain drivers and motherboards.
nosound This disables sound support and volume setting. This is useful
for systems where sound support causes problems.
nousb This disables the autoloading of USB modules. This is useful
for debugging USB issues.
Volume/Device Management:
dodevfs This enables the deprecated device filesystem on 2.6 systems.
You will also need to use noudev for this to take effect.
Since devfs is the only option with a 2.4 kernel, this option
has no effect if booting a 2.4 kernel.
doevms2 This enables support for IBM's pluggable EVMS, or Enterprise
Volume Management System. This is not safe to use with lvm2.
dolvm2 This enables support for Linux's Logical Volume Management.
This is not safe to use with evms2.
noudev This disables udev support on 2.6 kernels. This option requires
that dodevfs is used. Since udev is not an option for 2.4
kernels, this options has no effect if booting a 2.4 kernel.
unionfs Enables support for Unionfs on supported CD images. This will
create a writable Unionfs overlay in a tmpfs, allowing you to
change any file on the CD.
unionfs=X Enables support for Unionfs on supported CD images. This will
create a writable Unionfs overlay on the device you specify.
The device must be formatted with a filesystem recognized and
writable by the kernel.
Other options:
debug Enables debugging code. This might get messy, as it displays
a lot of data to the screen.
docache This caches the entire runtime portion of the CD into RAM, which
allows you to umount /mnt/cdrom and mount another CDROM. This
option requires that you have at least twice as much available
RAM as the size of the CD.
noload=X This causes the initial ramdisk to skip the loading of a
specific driver that may be causing a problem. Replace X with
the driver name. Multiple drivers can be specified by a
comma-separated list.
nox This causes an X-enabled LiveCD to not automatically start X,
but rather, to drop to the command line instead.
scandelay This causes the CD to pause for 10 seconds during certain
portions the boot process to allow for devices that are slow to
initialize to be ready for use.
scandelay=X This allows you to specify a given delay, in seconds, to be
added to certain portions of the boot process to allow for
devices that are slow to initialize to be ready for use.
Replace X with the number of seconds to pause.
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