[PATCH v3 0/5] Add partition type GUID support for environment

[Balaji Selvanathan]

On 4/20/2026 7:07 PM, Sumit Garg wrote:
> On Sun, Apr 19, 2026 at 03:54:02PM +0530, Balaji Selvanathan wrote:
>> This series adds support for locating partitions using GPT partition
>> type GUID instead of unique partition UUID. This enables the saveenv
>> command to work with partitions identified by their type rather than
>> unique identifiers, providing flexibility for systems where partition
>> UUIDs may vary across devices but types remain constant.
> Why don't we rather rely on partition name/label instead? That can be
> common across platforms too. I would rather prefer a config fragment for
> eg. UFS based environment or eMMC based environment and so on.
>
> -Sumit

Hi Sumit,

Using type GUIDs as they offer following advantages: they are 
standardized across vendors (e.g., ChromeOS kernel GUID, Linux 
filesystem GUID) unlike arbitrary partition names that vary by OEM or 
firmware version, they are immutable and set at partition creation, 
making them more robust than easily-modified partition names.

Regards,

Balaji

>
>> Patch 1 adds part_get_info_by_type_guid() function support
>> Patch 2 adds scsi_get_blk_by_type_guid() function support
>> Patch 3 adds support for partition type GUID based environment
>> Patch 4 enables partition type GUID configs for QCM6490 and QCS615
>> Patch 5 adds unit test for the partition type GUID lookup functionality
>>
>> Signed-off-by: Balaji Selvanathan <balaji.selvanathan at oss.qualcomm.com>
>> ---
>> Changes in v3:
>> - Addressed minor corrections in Patch 1 in part_get_info_by_type_guid function
>> - Refactor env_scsi_get_part and env_scsi_load functions based
>>    on the choice configs in Patch 3
>> - Add unit test for the partition type GUID lookup functionality in Patch 5
>> - Link to v2: https://lore.kernel.org/u-boot/20260109070912.4106466-1-balaji.selvanathan@oss.qualcomm.com/
>>
>> Changes in v2:
>> - Compute blk_find_max_devnum(UCLASS_SCSI) only once in scsi_get_blk_by_type_guid()
>> - Introduce a Kconfig choice config to select between UUID-based
>> and type GUID-based partition lookup methods.
>> - Enable above new config in qcom_qcs615_defconfig and qcm6490_defconfig
>> - Link to v1: https://lore.kernel.org/u-boot/20260108064947.3237361-1-balaji.selvanathan@oss.qualcomm.com/
>>
>> ---
>> Balaji Selvanathan (5):
>>        disk: Add partition lookup by type GUID functionality
>>        scsi: Add partition lookup by type GUID for SCSI devices
>>        env: scsi: Add support for partition type GUID based environment
>>        configs: Enable partition type GUID for QCM6490 and QCS615 boards
>>        test: dm: Add partition type GUID lookup test
>>
>>   configs/qcm6490_defconfig     |  5 +++++
>>   configs/qcom_qcs615_defconfig |  5 +++++
>>   disk/part.c                   | 37 +++++++++++++++++++++++++++++++
>>   drivers/scsi/scsi-uclass.c    | 28 ++++++++++++++++++++++--
>>   env/Kconfig                   | 51 ++++++++++++++++++++++++++++++++++++-------
>>   env/scsi.c                    | 45 +++++++++++++++++++++++---------------
>>   include/part.h                | 21 ++++++++++++++++++
>>   include/scsi.h                | 11 ++++++++++
>>   test/dm/part.c                | 48 ++++++++++++++++++++++++++++++++++++++++
>>   9 files changed, 223 insertions(+), 28 deletions(-)
>> ---
>> base-commit: e3405917a1806971d9e72a94186b299f05581e1a
>> change-id: 20260419-type-c6a48a1c273d
>>
>> Best regards,
>> -- 
>> Balaji Selvanathan <balaji.selvanathan at oss.qualcomm.com>
>>