Unique Universal Identification (UUID)

[gavin14]

Hi,

I was hoping someone could help me with the following.

When flashing the Jetson Xavier NX

• Is the device given an unique universal ID (UUID) or is this something I would have to create myself?

If this is part of the flashing process

• Is it a security measure?
• If I were to flash a number of devices would it be possible to flash them so they have the same UUID?

Thank you in advance,

Gavin

[JerryChang]

hello gavin14,

are you going to enable Jetson security? or, simply for image flashing?
you may using https://developer.nvidia.com/drive/sdk-manager for setting up development environment.

[linuxdev]

Note that if this is an eMMC model, then there are security fuses you can burn with a key. Once you do that though much of the content can only be flashed with that key (this is not encryption). I don’t think there is such an ability with SD card models.

[gavin14]

Hello JerryChang and linuxdev,

Thank you both for your reply.

When flashing the dev kit, I am flashing to an external eMMC SSD, which has an image of various scripts and content.

The dev kit I am working on was originally flashed this way by my predecessor. He has set me the challenge of recreating his method, but I was having difficulty until he briefly explained that there is a UUID file in the “bootloader” folder of the NVIDIA filesystem used for flashing (I am not using the SDK Manager).

I am trying to understand;

• Was the UUID (file) created when flashing, or was it created manually?
    ◦ (Where does the UUID come from?)

• Can it be changed?
    ◦ (IF the UUID is created when flashing (not created manually), is it created randomly  each time and is it possible to make the UUID the same if I were to flash a number of devices?)

• How is the UUID used?
    ◦ (Would I be correct to believe that there is a script on the external eMMC SSD that verifies the presents of the UUID when the dev kit starts up?)

Are you aware of any documentation that could give me a better understanding of a UUID?

Thank you for your time.

Gavin

[JerryChang]

hello gavin14,

typically, you can find the UUID of all the disk partitions by running blkid commands.
this UUID doesn’t change unless you format/delete the disk, it’ll generate a new UUID for the new filesystem.

[gavin14]

Hello JerryChang,

Thank you for your reply, it was very helpful!

Kind Regards,

Gavin