@geekmaster: thanks a lot for the explanations, that was very helpful! I'll try to "ssh-enable" my diags now, and will report back.
Just one question:
Originally Posted by geekmaster
You can still use MfgTool or imx_usb_loader with the custom u-boots I made, to boot to a selected mode.
Yes, sure... but that assumes that the device can be put into usb downloader mode in the first place. Did you succeed in doing so, and if so, how?