Meaning of 'upgrade id' when creating an DFU upgrade image?

[jorsc]

According to: https://www.xmos.com/developer/publishe ... on=&page=1
One should specify an --upgrade <id> when creating a new DFU image for upgrade. The upgrade id should be a unique number.

However I've used the 'xmosdfu' util (compiled for Linux) and made several successful upgrades using the same id.

I have not used the 'dfucons', maybe this tool uses it?

In any case I just wonder if and in that case how this id is used in the upgrade process.

[mon2]

Hi. When you perform this upgrade or any use of the xflash tool, pass the parameter of --verbose to see additional juicy information that may help the procedure.

[jorsc]

Thanks, I know the --verbose option but it does not explain how this parameter is used.