[U-Boot] Partition UUIDs in U-Boot and Linux (blkid vs 'part list')

[U-Boot] Partition UUIDs in U-Boot and Linux (blkid vs 'part list')

[Simon Glass]

Hi,

I find that blkid provides different output from 'part list' and I'm
not sure why:

=> part list scsi 0

Partition Map for SCSI device 0  --   Partition Type: EFI

Part Start LBA End LBA Name
Attributes
Type GUID
Partition GUID
  1 0x00000800 0x001007ff ""
attrs: 0x0000000000000000
type: c12a7328-f81f-11d2-ba4b-00a0c93ec93b
guid: 9d02e8e4-4d59-408f-a9b0-fd497bc9291c
  2 0x00100800 0x037d8fff ""
attrs: 0x0000000000000000
type: 0fc63daf-8483-4772-8e79-3d69d8477de4
guid: 965c59ee-1822-4326-90d2-b02446050059
  3 0x037d9000 0x03ba27ff ""
attrs: 0x0000000000000000
type: 0657fd6d-a4ab-43c4-84e5-0933c84b4f4f
guid: 2c4282bd-1e82-4bcf-a5ff-51dedbf39f17

$ sudo blkid
/dev/sda1: UUID="819A-4923" TYPE="vfat"
/dev/sda2: UUID="b2aaf743-0418-4d90-94cc-3e6108d7d968" TYPE="ext4"
/dev/sda3: UUID="742df38d-6a50-4b47-a39a-c0076b0cc057" TYPE="swap"

Does anyone know? I'd like U-Boot to be able to show the same
information as well as the TYPE.

Regards,
Simon

[U-Boot] Partition UUIDs in U-Boot and Linux (blkid vs 'part list')

[Tom Rini]

On Sat, May 07, 2016 at 11:51:12AM -0600, Simon Glass wrote:
> Hi,
> 
> I find that blkid provides different output from 'part list' and I'm
> not sure why:
> 
> => part list scsi 0
> 
> Partition Map for SCSI device 0  --   Partition Type: EFI
> 
> Part Start LBA End LBA Name
> Attributes
> Type GUID
> Partition GUID
>   1 0x00000800 0x001007ff ""
> attrs: 0x0000000000000000
> type: c12a7328-f81f-11d2-ba4b-00a0c93ec93b
> guid: 9d02e8e4-4d59-408f-a9b0-fd497bc9291c
>   2 0x00100800 0x037d8fff ""
> attrs: 0x0000000000000000
> type: 0fc63daf-8483-4772-8e79-3d69d8477de4
> guid: 965c59ee-1822-4326-90d2-b02446050059
>   3 0x037d9000 0x03ba27ff ""
> attrs: 0x0000000000000000
> type: 0657fd6d-a4ab-43c4-84e5-0933c84b4f4f
> guid: 2c4282bd-1e82-4bcf-a5ff-51dedbf39f17
> 
> $ sudo blkid
> /dev/sda1: UUID="819A-4923" TYPE="vfat"
> /dev/sda2: UUID="b2aaf743-0418-4d90-94cc-3e6108d7d968" TYPE="ext4"
> /dev/sda3: UUID="742df38d-6a50-4b47-a39a-c0076b0cc057" TYPE="swap"
> 
> Does anyone know? I'd like U-Boot to be able to show the same
> information as well as the TYPE.

Hmm.  A quick test here shows that it _is_ matching for MBR style
partition tables (which is what is common for TI/armv7 and why
ti_armv7_common.h grabs the likely rootfs PARTUUID and boots with
root=PARTUUID= like I imagine you're trying).

-- 
Tom
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[U-Boot] Partition UUIDs in U-Boot and Linux (blkid vs 'part list')

[Stephen Warren]

On 05/07/2016 11:51 AM, Simon Glass wrote:
> Hi,
>
> I find that blkid provides different output from 'part list' and I'm
> not sure why:

"part list" prints partition UUIDs (from the partition table), whereas I 
/think/ blkid prints filesystem UUIDs (from the fs superblock).

The kernel will accept either on its cmdline root= parameter, but you 
have to tell it which you're using, e.g. root=PARTUUID=partition_uuid, 
or IIRC root=UUID=fs_uuid.