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Cheatcodes - what they are and how to use them

Cheatcodes for Porteus

Warning: This document may be irrelevant to the Porteus version you are using (cheatcodes may change between releases). A copy of it can be found at /boot/docs/cheatcodes.txt on the Porteus ISO you have downloaded so please rely on it rather than this version.


Boot parameters (also known as cheatcodes) are used to affect the booting process of Porteus. The cheatcodes listed here are only those that are specific to Porteus (see the final note for information on cheatcodes that apply to all linux distributions, including Porteus).  You can use these parameters to disable desired kinds of hardware detection, start Porteus from a specific location, load additional modules, etc.

Reboot your computer and wait several seconds until the graphical Porteus logo appears with a boot menu. Choose your desired menu entry and hit Tab, which will allow you to edit the command line. Add your desired boot argument from the list below to affect booting the way you like. Here's an example of what the boot line would look like, adding the noauto and copy2ram cheatcodes to a standard Porteus boot option (which already has some other cheatcodes by default):

APPEND initrd=initrd.xz lxde changes=/porteus/ noauto copy2ram 

These cheatcodes can also be added to the APPEND line of your /boot/syslinux/porteus.cfg entries (or other bootloader config files) to apply them automatically on every boot.


List of available cheatcodes (in alphabetical order):

NOTE: Example cheatcodes are sometimes listed below inside single
quotes (e.g. 'example=somevalue') for clarity in the documentation.
When you enter these cheatcodes during boot time or in your
porteus.cfg, you should not use these quote marks.

autoexec=my_script
autoexec=my_script;reboot

   ... Execute specified command(s) before logging in to Porteus.
       Use semicolons (;) as command separators with no spaces.
   ... If you need to use spaces in the commandline, replace them
       with '~'. For example, 'autoexec=echo~Shutting~power;poweroff'
       will echo your text with spaces instead of '~'.

base_only

   ... This cheatcode will prevent the system from loading any
       modules at startup other than the 'base' modules included
       with the default ISO (000-kernel.xzm, 001-core.xzm, etc).
       This is useful in debugging to see if problems you are
       having are associated with some module you've added to the
       system.

changes=/dev/device
changes=/path/
changes=/path/file.dat

   ... All changes made in Porteus are kept in memory until you reboot.
       With this boot parameter, you tell Porteus to use a device
       (or a file or directory) other than your memory for storing
       changes. You can, for example, format your disk partition
       /dev/sdb2 with some Linux filesystem (eg. xfs) and then use
       'changes=/dev/sdb2' to store all changes to that partition.
       This way you won't loose your changes after reboot.
   ... If you use a file image instead of a device, and the image
       contains a valid filesystem, Porteus will mount it on a loop
       device and will store changes to it.
   ... If you use a directory, Porteus will save changes to it (it
       will make a 'changes' subdirectory there). This should only
       be used for linux filesystems, if changes need to be saved to a
       FAT or NTFS partition, a savefile container has to be used.

copy2ram

   ... Copy all modules to RAM. You'll need at least 256MB of RAM
       to boot Porteus properly. 64-bit Porteus with KDE-4 requires
       at least 768MB of RAM for this.
       Copy2ram slows down the boot phase but speeds up Porteus!

       Reminder: the 'noeject' cheatcode can be used together with
       'copy2ram' to prevent unmounting of your booting media
       (CD/DVD disc, usb, card readers, etc).
       You can also use the 'rammod' cheatcode to selectively load
       modules to RAM - see the 'rammod' description below.

debug

   ... Start the shell several times during the boot to perform
       debugging actions.

delay=some_value

   ... To be used for devices which need extra time to settle up.
       Example: 'delay=5' will cause a 5 second delay before Porteus
       starts booting.

extramod=/path/folder_with_modules
extramod=/path/folder_with_modules;/path2/folder_with_modules

   ... This cheatcode lets you load modules from one or more external
       folders that are located outside of the /porteus directory.
       Multiple folders can be specified, with full paths separated by
       a semicolon without any spaces.
       Examples:
       'extramod=/mnt/sdb3/porteus-modules'
       'extramod=/mnt/sdb3/porteus-modules;/mnt/sdc4/inkscape_modules'

from=/dev/device
from=/path/folder
from=/path/porteus.iso

   ... Loads Porteus from the specified device, folder or ISO file.
       Examples:
       'from=/dev/sdb2' will attempt to load the Porteus data from
       the second partition on your second drive.
       'from=/mnt/sda2/linux-testing' will attempt to load Porteus data
       from the 'linux-testing' folder placed on the second partition.
       'from=/linux-ISO/porteus.iso' will attempt to load the Porteus
       data from an ISO file placed inside the 'linux-ISO' folder.

       If the destination partition is not provided with this
       cheatcode, the booting script will search through all available
       devices for your data.

      Be aware that if you are using the lilo bootloader, you must put the
      from= cheatcode on the append line and it MUST contain an equals sign
      between append and the appended string.
      Example: APPEND = "from=/dev/sda2"

fsck

   ... Enables a filesystem check for ext(2,3,4) and reiserfs
       partitions during boot time before anything is mounted by
       Porteus. XFS does not need fsck as a check is performed
       automatically during the mount operation.
       NOTE:  On some systems, you will need to use the 'delay='
       cheatcode in order to allow your devices to settle up.
       This should only be needed to fsck usb flash drives.

kmap=keyboardmap

   ... Specifies the preferred keyboard layout for KDE/LXDE/XFCE or
       other desktop. A full list of supported layouts can be found in
       the /etc/X11/xkb/symbols folder.
       Example: 'kmap=ara' will set the arabic keyboard layout at
       startup.

load=module
load=module[1];module[n]

   ... Load optional modules from /optional/ directory on the booting
       media. Additional modules can be listed, separated
       by semicolons, without spaces.
       Exampe: 'load=gimp;inkscape' would search for and load any
       modules in the /porteus/optional folder that contain the strings
       'gimp' or 'inkscape'.

login=user_name

   ... Lets you specify the name of the user (could be also 'root')
       which will be autologged into GUI session.
       If username is not provided then booting stops on the lxdm/kdm
       login screen.


lxde

   ... This parameter will let you use lxde as the default desktop.

mopt

   ... This cheatcode will allow you to customize your filesystem
       mount options.  By default, the mount options for all
       filesystems in Porteus are: "noatime,nodiratime,suid,dev,exec,async".
       Each option must be separated wtih a comma "," with no spaces
       between any characters.
       Example: 'mopt=realtime,sync,users,nosuid,noexec'
       See 'man mount' for more information on specific mount options.

noauto

   ... Do not mount any devices during startup.
       Every disk needs to be mounted manually in order to access it.

nocd

   ... Do not discover any optical devices during startup.

noeject

   ... Do not eject CD/DVD disc during boot time and shutdown.

       NOTE: when the 'copy2ram' cheatcode is used with 'noeject',
       this will prevent the unmounting of your booting media
       (CD/DVD disc, usb, card readers, etc). To eject the CD you
       will have to umount /mnt/sr0 manually and issue the command
       'eject /dev/sr0' from a console.

nohd

   ... Do not discover any hard drives during startup.

nohotplug

   ... Disable specified hardware autodetection in the case of
       hangups. None of your hardware will be detected, and you'll
       have to use the "modprobe" command after logging in to
       text mode and load all needed drivers manually.

noload=module
noload=module[1];module[n]

   ... Disable loading of any modules specified. This affects all the
       modules on the Porteus booting mendia, including /base and /modules
       folders, so using noload=kde will disable loading of all modules
       with 'kde' in the name. It is useful with the copy2ram cheatcode,
       because any un-used module is not copied to ram.  Multiple modules
       can be listed, but they must be separated by semicolons, with no
       spaces.
       Example: 'noload=lxde;devel' will prevent the loading of any
       modules with a name containing the strings 'lxde' or 'devel'

nomagic

   ... Do not bind "magic folders" during boot time. Useful when
       something went wrong with your Porteus configuration and you
       want to boot into true 'Always Fresh' mode.

nonetwork

   ... This boot parameter will prevent Porteus from automatically
       establishing a network connection on start-up.
       Note that this cheatcode makes some modifications to
       your system which must be manually restored, so it is
       recommended that you only use this cheatcode in "Always
       Fresh" mode. If you've ignored this advice and need to
       recover your network connection, please run the following:

       chmod +x /etc/rc.d/rc.inet1 /etc/rc.d/rc.networkmanager
       sed -i 's/Hidden=true//g' /etc/xdg/autostart/nm-applet.desktop

norootcopy

   ... Do not copy files from your rootcopy directory at boot-up.
       Like the 'nomagic' cheatcode, this is useful if something went
       wrong with your Porteus configuration and you want to boot into
       true 'Always Fresh' mode.

noswap

   ... Prevents the automatic use of an existing swap partition.
       By default, Porteus searches your attached drives for
       partitions that are formatted as swap, and will mount them
       for use within Porteus. The 'noswap' cheatcode disables
       this behaviour.

ramsize=some_value%

   ... Will let you set a custom size for the tmpfs partition
       which is used as the root (/) of your live filesystem
       when changes are not saved on a real filesystem
       (i.e., Always Fresh mode). The default value is 60% of
       available RAM memory.
       Example: 'ramsize=40%'

rammod=module
rammod=folder
rammod=module[1];module[n];folder[1];folder[2]

   ... Specify module(s) or folder(s) containing modules which should
       be copied to RAM when using the 'copy2ram' cheatcode.  This
       allows you to have the speed benefit of 'copy2ram' for the
       modules you use the most, without occupying your RAM with those
       modules that you make use of less often.  Any modules that are
       not specified will be mounted in place on the block device, so
       your device will remain mounted while Porteus is running.

       You can use a full or partial names for your search string,
       but keep in mind that all modules and folders that match your
       string will be loaded into RAM; if you have extra modules in a
       folder named 'lxde' and you use 'rammod=lxde', then the module
       003-lxde.xzm from /porteus/base will be loaded in addition to
       all modules in the 'lxde' folder.

       NOTE: 'rammod' cannot be used without 'copy2ram', and it also
       will not load modules from /porteus/optional or external
       locations unless you also specify these modules with the
       'load=' or 'extramod=' cheatcodes.

       Examples:
       'rammod=001;002;004;firefox'
       'extramod=/mnt/sdb3/porteus/gimp rammod=001;002;gimp'

rootcopy=/path/to_folder/with_files

   ... Copy files from specified directory directly to the live
       filesystem. This directory will be used instead of the
       traditional /porteus/rootcopy.
       Example: 'rootcopy=/mnt/sda5/porteus-files'

sgnfile=some_name.sgn

   ... This cheatcode specifies the *.sgn file which Porteus will
       search for.  This is useful when you want to store several
       Porteus editions on one disk/disc.
       Example: 'sgnfile=porteus-usb.sgn'
       
timezone=region/zone

   ... Tell Porteus that your system clock is set to UTC rather than
       'localtime' and specify the correct timezone for your location.
       A full listing of available timezones can be found in the file
       /usr/sbin/timeconfig
       Example: 'timezone=Europe/Warsaw'
       Example: 'timezone=Factory'


vga_detect

   ... Automatically detects AMD or nVidia video cards and loads the
       proprietary drivers at startup.  You must have a module
       containing the appropriate graphics driver (nVidia or amd-catalyst)
       stored in your /porteus/optional/ directory.  These modules
       are available in the download section of the Porteus website
       (www.porteus.org/download) for each edition and version of
       Porteus.  If you compile your own driver, please note that
       the module's name must begin with the string 'nVidia-' or
       'amd-catalyst' because the startup script searches for the driver
       modules by name.

       This cheatcode allows users to easily switch back and forth
       bewteen different hardware configurations while using the
       proprietary drivers because both driver modules can sit side
       by side in /porteus/optional/ without interfering with one
       another.  They are only activated when needed.

volume=some_value%

   ... This parameter sets the system's Master Volume channel to
       the value specified (as a percentage).  You will be able to raise
       or lower the volume after you boot up as normal.
       The default value is 75%.
       Example: 'volume=0%' will boot into your chosen GUI silently.

xfce
   ... This parameter will let you use XFCE as the default desktop.
       
zram=some_value%

   ... enable the use of zram, which is a compressed block device
       inside your RAM that acts as a swap partition.  Zram operates
       faster than using swap on a hard drive and creates more
       (virtual) memory than using RAM alone because the data inside
       is compressed.  This will provide a performance boost on
       systems with low RAM, but it uses more processor cycles (to
       compress and decompress the data) than regular swap.
       Example: 'zram=33%' will set aside 33% of your RAM as a zram
       device.


SPECIAL NOTE FOR USING CHEATCODES WITH 'LABEL' AND 'UUID':
If you specify a LABEL or UUID with a cheatcode, remember that all
portions of these commands are case sensitive.  You should use a
unique label for each of your partitions if you wish to use device
labels with your cheatcodes. Use the 'blkid' command to view your
device's UUID and LABEL. Using UUID and LABEL can be quite handy
because they are unique to your device, and your data will be found
and properly mapped on different hardware configurations.
Every cheatcode which contains a /path can take advantage of 'UUID:'
and 'LABEL:' extensions.

Examples:
changes=UUID:STrING-0F-ChARACtERS/path/file.dat
extramod=LABEL:YourLabelName/path/to_folder/with_modules
from=UUID:STrING-0F-ChARACtERS/path/folder
rootcopy=LABEL:YourLabelName/path/to_folder/with_files


SPECIAL NOTE FOR USING CHANGES CHEATCODE WITH 'EXIT:' extension:
The 'EXIT:' extension tells the 'changes=' cheatcode to keep all
of the files that have been added/deleted/modified during the
live session stored in memory until you reboot/shutdown. Your
RAM works as a buffor which gets dumped on the drive only once,
when the session is finished.
'changes=EXIT:' cheatcode has following advantages:
- Porteus works as fast as in 'Always Fresh' mode as all modifications
  to files and folders are performed in RAM.
- reduced number of read/write cycles should extend the life of SSD
  drives and usb sticks.
The only disadvantage of the 'EXIT:' extension is that the session
does not get saved in cases where you experience a hang (kernel crash)
or power interrupt.
Please use with caution!

Examples:
changes=EXIT:/dev/device
changes=EXIT:/path/
changes=EXIT:UUID:STrING-0F-ChARACtERS/path/file.dat

NOTE FOR THE LILO USERS:
If the LILO bootloader has been installed, you will get a text menu
with the standard boot options (KDE, LXDE, Always Fresh, etc).
Use your arrow key to highlight your desired entry (if you are using
the first entry (KDE), press down, then up to highlight KDE).
The name of your boot option is added to the 'boot:' line, and you can
type your cheatcodes after that.
For example:

boot:  KDE debug noauto

would boot into KDE with all of the standard codes used for KDE, plus
debug and noauto.  If you want to use LILO with custom cheatcodes at
every boot without manually entering them each time, you must modify
the /boot/syslinux/lilo.conf and then repeat installation by running
/boot/Porteus-installer-for-Linux.com utility as LILO must reload it's
configuration.

FINAL NOTE:
The cheatcodes listed above are those that are unique to Porteus.
There are literally hundreds of other kernel boot parameters
that can be used.  For more information on these parameters visit:
http://www.kernel.org/doc/Documentation/kernel-parameters.txt

Thanks for reading!