mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-12-17 16:53:06 +00:00
44c5d7764b
Adds initial documentation for the gpt command Signed-off-by: Joshua Watt <JPEWhacker@gmail.com>
184 lines
5.4 KiB
ReStructuredText
184 lines
5.4 KiB
ReStructuredText
.. SPDX-License-Identifier: GPL-2.0+
|
|
|
|
gpt command
|
|
===========
|
|
|
|
Synopsis
|
|
--------
|
|
|
|
::
|
|
|
|
gpt enumerate <interface> <dev>
|
|
gpt guid <interface> <dev> [<varname>]
|
|
gpt read <interface> <dev> [<varname>]
|
|
gpt rename <interface> <dev> <part> <name>
|
|
gpt repair <interface> <dev>
|
|
gpt setenv <interface> <dev> <partition name>
|
|
gpt swap <interface> <dev> <name1> <name2>
|
|
gpt verify <interface> <dev> [<partition string>]
|
|
gpt write <interface> <dev> <partition string>
|
|
|
|
Description
|
|
-----------
|
|
|
|
The gpt command lets users read, create, modify, or verify the GPT (GUID
|
|
Partition Table) partition layout.
|
|
|
|
Common arguments:
|
|
|
|
interface
|
|
interface for accessing the block device (mmc, sata, scsi, usb, ....)
|
|
|
|
dev
|
|
device number
|
|
|
|
partition string
|
|
Describes the GPT partition layout for a disk. The syntax is similar to
|
|
the one used by the :doc:`mbr command <mbr>` command. The string contains
|
|
one or more partition descriptors, each separated by a ";". Each descriptor
|
|
contains one or more fields, with each field separated by a ",". Fields are
|
|
either of the form "key=value" to set a specific value, or simple "flag" to
|
|
set a boolean flag
|
|
|
|
The first descriptor can optionally be used to describe parameters for the
|
|
whole disk with the following fields:
|
|
|
|
* uuid_disk=UUID - Set the UUID for the disk
|
|
|
|
Partition descriptors can have the following fields:
|
|
|
|
* name=<NAME> - The partition name, required
|
|
* start=<BYTES> - The partition start offset in bytes, required
|
|
* size=<BYTES> - The partition size in bytes or "-" to expand it to the whole free area
|
|
* bootable - Set the legacy bootable flag
|
|
* uuid=<UUID> - The partition UUID, optional if CONFIG_RANDOM_UUID=y is enabled
|
|
* type=<UUID> - The partition type GUID, requires CONFIG_PARTITION_TYPE_GUID=y
|
|
|
|
|
|
If 'uuid' is not specified, but CONFIG_RANDOM_UUID is enabled, a random UUID
|
|
will be generated for the partition
|
|
|
|
gpt enumerate
|
|
~~~~~~~~~~~~~
|
|
|
|
Sets the variable 'gpt_partition_list' to be a list of all the partition names
|
|
on the device.
|
|
|
|
gpt guid
|
|
~~~~~~~~
|
|
|
|
Report the GUID of a disk. If 'varname' is specified, the command will set the
|
|
variable to the GUID, otherwise it will be printed out.
|
|
|
|
gpt read
|
|
~~~~~~~~
|
|
|
|
Prints the current state of the GPT partition table. If 'varname' is specified,
|
|
the variable will be filled with a partition string in the same format as a
|
|
'<partition string>', suitable for passing to other 'gpt' commands. If the
|
|
argument is omitted, a human readable description is printed out.
|
|
CONFIG_CMD_GPT_RENAME=y is required.
|
|
|
|
gpt rename
|
|
~~~~~~~~~~
|
|
|
|
Renames all partitions named 'part' to be 'name'. CONFIG_CMD_GPT_RENAME=y is
|
|
required.
|
|
|
|
gpt repair
|
|
~~~~~~~~~~
|
|
|
|
Repairs the GPT partition tables if it they become corrupted.
|
|
|
|
gpt setenv
|
|
~~~~~~~~~~
|
|
|
|
The 'gpt setenv' command will set a series of environment variables with
|
|
information about the partition named '<partition name>'. The variables are:
|
|
|
|
gpt_partition_addr
|
|
the starting offset of the partition in blocks as a hexadecimal number
|
|
|
|
gpt_partition_size
|
|
the size of the partition in blocks as a hexadecimal number
|
|
|
|
gpt_partition_name
|
|
the name of the partition
|
|
|
|
gpt_partition_entry
|
|
the partition number in the table, e.g. 1, 2, 3, etc.
|
|
|
|
gpt swap
|
|
~~~~~~~~
|
|
|
|
Changes the names of all partitions that are named 'name1' to be 'name2', and
|
|
all partitions named 'name2' to be 'name1'. CONFIG_CMD_GPT_RENAME=y is
|
|
required.
|
|
|
|
gpt verify
|
|
~~~~~~~~~~
|
|
|
|
Sets return value $? to 0 (true) if the partition layout on the
|
|
specified disk matches the one in the provided partition string, and 1 (false)
|
|
if it does not match. If no partition string is specified, the command will
|
|
check if the disk is partitioned or not.
|
|
|
|
gpt write
|
|
~~~~~~~~~
|
|
|
|
(Re)writes the partition table on the disk to match the provided
|
|
partition string. It returns 0 on success or 1 on failure.
|
|
|
|
Configuration
|
|
-------------
|
|
|
|
To use the 'gpt' command you must specify CONFIG_CMD_GPT=y. To enable 'gpt
|
|
read', 'gpt swap' and 'gpt rename', you must specify CONFIG_CMD_GPT_RENAME=y.
|
|
|
|
Examples
|
|
~~~~~~~~
|
|
Create 6 partitions on a disk::
|
|
|
|
=> setenv gpt_parts 'uuid_disk=bec9fc2a-86c1-483d-8a0e-0109732277d7;
|
|
name=boot,start=4M,size=128M,bootable,type=ebd0a0a2-b9e5-4433-87c0-68b6b72699c7,
|
|
name=rootfs,size=3072M,type=0fc63daf-8483-4772-8e79-3d69d8477de4;
|
|
name=system-data,size=512M,type=0fc63daf-8483-4772-8e79-3d69d8477de4;
|
|
name=[ext],size=-,type=0fc63daf-8483-4772-8e79-3d69d8477de4;
|
|
name=user,size=-,type=0fc63daf-8483-4772-8e79-3d69d8477de4;
|
|
name=modules,size=100M,type=0fc63daf-8483-4772-8e79-3d69d8477de4;
|
|
name=ramdisk,size=8M,type=0fc63daf-8483-4772-8e79-3d69d8477de4
|
|
=> gpt write mmc 0 $gpt_parts
|
|
|
|
|
|
Verify that the device matches the partition layout described in the variable
|
|
$gpt_parts::
|
|
|
|
=> gpt verify mmc 0 $gpt_parts
|
|
|
|
|
|
Get the information about the partition named 'rootfs'::
|
|
|
|
=> gpt setenv mmc 0 rootfs
|
|
=> echo ${gpt_partition_addr}
|
|
2000
|
|
=> echo ${gpt_partition_size}
|
|
14a000
|
|
=> echo ${gpt_partition_name}
|
|
rootfs
|
|
=> echo ${gpt_partition_entry}
|
|
2
|
|
|
|
Get the list of partition names on the disk::
|
|
|
|
=> gpt enumerate
|
|
=> echo gpt_partition_list
|
|
boot rootfs system-data [ext] user modules ramdisk
|
|
|
|
|
|
Get the GUID for a disk::
|
|
|
|
=> gpt guid mmc 0
|
|
bec9fc2a-86c1-483d-8a0e-0109732277d7
|
|
=> gpt guid mmc gpt_disk_uuid
|
|
=> echo ${gpt_disk_uuid}
|
|
bec9fc2a-86c1-483d-8a0e-0109732277d7
|