I have a bunch of Rockchip R2S devices which I would like to generate static identifiers for that stick to a given device. I did use the MAC-Address in the past but for the R2S this can't be used anymore. Are there any other components you could think of that are unique to a device and can be queried from userland? I did try to find a uid under /sys/* but without any success so far.

Thanks a lot for any ideas.