The P2D2 is designed with components on one side only but that is not strictly true, putting aside the optional flip-side microSD and LEDs etc. By designing a small thin PCB with HyperRAM and other local peripherals I can mate this onto the back of the P2D2 as an SMD component. Part of the PCB will act as an additional heatsink.
Now here are some questions I'd like to ask.
1) Is there some consensus on how best to connect the HyperRAM and clocks?
2) Although I could use an ESP8266 for WiFi, I'd like to incorporate BLE as well. Any suggestions?
3) What about a raw microUSB connector?
The P2D2 Mate will also have a DS3231 type RTC with supercap backup and maybe some LEDs etc.
There's also a P2D2 DEV motherboard that incorporates quite a number of connectors and functions for audio and LAN and VGA etc.