Power & Source of Big Ideas

Hi, Currently I'm testing with a NanoPC-T6. Can anyone tell me what the power requirements are for the T6? Geometry Dash Scratch The specification tells "12V". The schematics show "DC12V Adapter" => "BUCK +4V". What range can I allow for? 12V +/-5% ? +/-10% ?? +/-20% ?...
What is the correct partition layout for writing a bootable SD card with U-Boot and Linux? The wikis continuously link to Google Drive and nothing can be downloaded from it since the download limits on all the files have been exceeded. I don't really care about using weird Windows utilities anyway,...