Hello Torsten I will flash U-boot to the SPI as soon as I feel confident enough. Having the stuff on a SD-card seems to work fine for now, although admittedly, it is a bodge. My 60 watt PD seems to combine well with the Rock 5 and so far there have been no issues. I'm not trying to trouble-shoot anything as things work well. It was just my curiosity that got triggered. "What voltage do I get?" A side effect of that simple question is that I now am trying to understand why I can't get the answer to the seemingly simple voltage question. You've created a HCL page: https://en.opensuse.org/HCL:ROCK_Pi_5 I did see the page but... Could I humbly suggest some changes? https://forums.opensuse.org/t/does-the-os-know-what-voltage-the-sbc-gets/173... (Please, I'm trying to be clear, not harsh). About the sensors... The users at the Radxa forum suggested that it might have something to do with the fact that my Tumbleweed system uses ACPI. If so, then how do I make the OS recognize the sensors? ...like the SARADC unit? Friendly greetings --hukka