NAME

       cgpt - Utility to manipulate GPT partitions with Chromium OS extensions

SYNOPSIS

       cgpt COMMAND [OPTIONS] DRIVE

DESCRIPTION

       Cgpt  is  a  tool  to  manipulate  a  GUID Partition Table from the command line. Although
       several other utilities exist for the same basic purpose - some with more features  and  a
       captive  user  interface - cgpt is unique in that it also supports Chromium OS extensions.
       These extensions are not generally useful; they are specific to the u-boot firmware  found
       on  some  Chromebooks.  They may be used to change priority for kernel partitions and give
       other hints to u-boot Chromebook firmware. Use this utility only to manipulate a partition
       table for compatible Chromebooks.

COMMANDS

       Each  action  performed by this program - with the notable exception of the -h OPTION - is
       initiated by a command which tells cgpt the type of operation to  perform.  All  available
       commands are described below.

       create Create or reset GPT headers and tables.

       add    Add, edit, or remove a partition entry.

       show   Show the partition table and entries.

       repair Repair damaged GPT headers and tables.

       boot   Edit the PMBR sector for legacy BIOSes.

              If no BOOT OPTIONS are specified, this command will just print the PMBR boot GUID.

       find   Find a partition by its GUID.

              If no DRIVE is specified, this command will scan all physical drives for a match.

       prioritize
              Reorder the priority of all ChromeOS kernel partitions.

              If  no  options  are  specified,  this command will set the lowest active kernel to
              priority 1 while maintaining the original order.

       legacy Switch between GPT and Legacy GPT.

GENERAL OPTIONS

       The options described in this section apply to every COMMAND supported by this program.

       -h     For more detailed usage, use cgpt COMMAND -h

EXAMPLES

       The following examples demonstrate valid syntax only. It is up to you  to  interpret  them
       based on the documentation in this manual.

       cgpt show /dev/mmcblk0
       cgpt create /dev/mmcblk0
       cgpt add -i 2 -S 1 -T 15 -P 15 /dev/mmcblk0
       cgpt add -i 1 -t data -l "STATE" /dev/mmcblk0
       cgpt add -i 2 -t kernel -l "KERN-A" /dev/mmcblk0
       cgpt add -i 3 -t rootfs -l "ROOT-A" /dev/mmcblk0

AUTHOR

       This manual page was written by Karl Lenz <xorangekiller@gmail.com> for the Debian project
       (but may be used by others).

COPYRIGHT

       Cgpt is copyright 2010-2013, The Chromium OS Authors
       This manual page is copyright 2014, Karl Lenz

       Copying and distribution of this file, with or without modification, are permitted in  any
       medium without royalty provided the copyright notice and this notice are preserved.

       Cgpt  is  provided  "as  is" with no warranty. The exact terms under which you may use and
       (re)distribute this program are detailed in the BSD 3-Clause License, which is distributed
       with  this  program  in  the LICENSE file. On Debian systems, the complete text of the BSD
       3-Clause License can be found in /usr/share/common-licenses/BSD.

SEE ALSO

       parted(8), gdisk(8), gptsync(8)