[PATCH 2/3] doc: cmd: gpt: add information on type partition
Patrice CHOTARD
patrice.chotard at foss.st.com
Thu May 22 08:16:39 CEST 2025
On 5/19/25 11:04, Patrick Delaunay wrote:
> Add information on type partition, copied from README.gpt.
>
> I also correct issue for gpt_parts variable and add example of
> "gpt read" usage.
>
> Signed-off-by: Patrick Delaunay <patrick.delaunay at foss.st.com>
> ---
>
> doc/usage/cmd/gpt.rst | 93 ++++++++++++++++++++++++++++++++++++++-----
> 1 file changed, 84 insertions(+), 9 deletions(-)
>
> diff --git a/doc/usage/cmd/gpt.rst b/doc/usage/cmd/gpt.rst
> index 8534f78cbac0..13e8783be9b8 100644
> --- a/doc/usage/cmd/gpt.rst
> +++ b/doc/usage/cmd/gpt.rst
> @@ -54,7 +54,7 @@ partition string
>
> * 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
> + * size=<BYTES> - The partition size in bytes or "-" for the last partition 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
> @@ -63,6 +63,23 @@ partition string
> If 'uuid' is not specified, but CONFIG_RANDOM_UUID is enabled, a random UUID
> will be generated for the partition
>
> + If 'type' is not specified or without CONFIG_PARTITION_TYPE_GUID=y,
> + the used partition type GUID is PARTITION_BASIC_DATA_GUID.
> +
> + Some strings can be also used at the place of the known partition type GUID:
> + * "mbr" = LEGACY_MBR_PARTITION_GUID (024DEE41-33E7-11D3-9D69-0008C781F39F)
> + * "msft" = PARTITION_MSFT_RESERVED_GUID (E3C9E316-0B5C-4DB8-817D-F92DF00215AE)
> + * "data" = PARTITION_BASIC_DATA_GUID (EBD0A0A2-B9E5-4433-87C0-68B6B72699C7)
> + * "linux" = PARTITION_LINUX_FILE_SYSTEM_DATA_GUID (0FC63DAF-8483-4772-8E79-3D69D8477DE4)
> + * "raid" = PARTITION_LINUX_RAID_GUID (A19D880F-05FC-4D3B-A006-743F0F84911E)
> + * "swap" = PARTITION_LINUX_SWAP_GUID (0657FD6D-A4AB-43C4-84E5-0933C84B4F4F)
> + * "lvm" = PARTITION_LINUX_LVM_GUID (E6D6D379-F507-44C2-A23C-238F2A3DF928)
> + * "u-boot-env" = PARTITION_U_BOOT_ENVIRONMENT(3DE21764-95BD-54BD-A5C3-4ABE786F38A8)
> + * "system" = PARTITION_SYSTEM_GUID (C12A7328-F81F-11D2-BA4B-00A0C93EC93B)
> +
> + The GPT partitions layout and associated 'type' are also printed with the
> + :doc:`part command <part>` command by typing "part list".
> +
> gpt enumerate
> ~~~~~~~~~~~~~
>
> @@ -162,16 +179,17 @@ 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
> + => 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=user,size=512M,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;\
> + name=[ext],size=-,type=0fc63daf-8483-4772-8e79-3d69d8477de4'
> => gpt write mmc 0 $gpt_parts
>
> +Last partition "[ext]" with '-' is extended up to the end of the disk
>
> Verify that the device matches the partition layout described in the variable
> $gpt_parts::
> @@ -228,3 +246,60 @@ Swap the order of the 'boot' and 'rootfs' partition table entries::
> => gpt setenv mmc 0 boot
> => echo ${gpt_partition_entry}
> 2
> +
> +Other example: a disk with known partition types::
> +
> + => setenv gpt_parts 'name=u-boot,size=32M,type=data;\
> + name=env,size=1M,type=u-boot-env;
> + name=ESP,size=128M,type=system;
> + name=rootfs,size=3072M,type=linux;
> + name=swap,size=100M,type=swap;
> + name=user,size=-,type=linux'
> + => gpt write mmc 0 $gpt_parts
> +
> + => part list mmc 0
> + Partition Map for mmc device 0 -- Partition Type: EFI
> + Part Start LBA End LBA Name
> + Attributes
> + Type GUID
> + Partition GUID
> + 1 0x00000022 0x00010021 "u-boot"
> + attrs: 0x0000000000000000
> + type: ebd0a0a2-b9e5-4433-87c0-68b6b72699c7
> + (data)
> + guid: 502d48f6-81c0-488f-bdc0-ad602498f3ce
> + 2 0x00010022 0x00010821 "env"
> + attrs: 0x0000000000000000
> + type: 3de21764-95bd-54bd-a5c3-4abe786f38a8
> + (u-boot-env)
> + guid: 9dc62338-459a-485e-bd8f-b3fbf728d9c0
> + 3 0x00010822 0x00050821 "ESP"
> + attrs: 0x0000000000000000
> + type: c12a7328-f81f-11d2-ba4b-00a0c93ec93b
> + (EFI System Partition)
> + guid: 8a3a1168-6af8-4ba7-a95d-9cd0d14e1b3d
> + 4 0x00050822 0x00650821 "rootfs"
> + attrs: 0x0000000000000000
> + type: 0fc63daf-8483-4772-8e79-3d69d8477de4
> + (linux)
> + guid: 411ffebc-8a19-469d-99a9-0982409a6851
> + 5 0x00650822 0x00682821 "swap"
> + attrs: 0x0000000000000000
> + type: 0657fd6d-a4ab-43c4-84e5-0933c84b4f4f
> + (swap)
> + guid: f8ec0410-95ec-4e3e-8b98-fb8cf271a201
> + 6 0x00682822 0x01dacbde "user"
> + attrs: 0x0000000000000000
> + type: 0fc63daf-8483-4772-8e79-3d69d8477de4
> + (linux)
> + guid: c5543e1c-566d-4502-99ad-20545007e673
> +
> +Modifying GPT partition layout from U-Boot::
> +
> + => gpt read mmc 0 current_partitions
> + => env edit current_partitions
> + edit: uuid_disk=[...];name=part1,start=0x4000,size=0x4000,uuid=[...];
> + name=part2,start=0xc000,size=0xc000,uuid=[...];[ . . . ]
> +
> + => gpt write mmc 0 $current_partitions
> + => gpt verify mmc 0 $current_partitions
Reviewed-by: Patrice Chotard <patrice.chotard at foss.st.com>
Thanks
Patrice
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