Unfortunately there appears to be no detailed documentation at all (unless you count a pile of Linux and bootloader patches, which I don't) for the peripherals, etc, outside of the core complex on the SoC:
> unless you count a pile of Linux and bootloader patches, which I don't
This is what drives me crazy. Vendor claims "open source" which means an outdated linux image and the source code is wrapped up inside of a megalith build monstrosity like penguintronix or yocto. Utter junk these things are.
This is why so much hardware ends up in landfills. No thanks to undocumented junk.