I currently don’t unfortunately. I know we’d need to connect to pins 41-46 for V_ADP_GPU for power as shown in Link 1 and the image. For the ground (GND_ADP_GPU) pins, I believe that’s 47-51. It’s also in the image’s legend as dark green, although the image doesn’t show it as dark green for some reason. I believe I could make a small connector that piggybacks off of the current interposer connection by sandwiching itself between the interposer and mainboard. An easier and more physically stable piggyback connection would be to connect to the 8 pins on the expansion bay itself that the interposer attaches to, but I can’t find any documentation as to what that pinout is.
From Link 2, the Expansion Bay Developer Program, Nirav shares part of the power map but mentioned that they haven’t defined the EC communication yet (Reply #16), so I’m not too sure where to go from there. I went ahead and asked, hopefully I can learn more!
Link 1: ExpansionBay/Electrical/Dual-channel 74P FXBeam, length 27.75mm _Rev 2_(Public version).pdf at main · FrameworkComputer/ExpansionBay · GitHub
Link 2: Expansion Bay Developer Program - #16 by nrp
