To my surprise and delight I didn’t need to mess with Rockchips ddrbin. Linux bootet fine and the full 32GB were immediately detected. I assume there is room for optimising settings for the new chips, but good enough for now.
@space (you are right on the surface tension thing) That's why on tje smt line we are a bit carefree with big enough pads in a component, because they _magically_ move into place.