But if there was a Tech Talk, when GHI was ready, that gave one complete, step by step example for one set of desired periperals on one specific board; that would sure be a great starting point. For example, using one of the more capable STM Discovery boards (see Suggested Tech Talk: Intro to Porting TinyCLR OS - #3 by ianlee74), you could start with mapping additional external RAM and ROM (because they takes a lot of pins out of the mix and will probably require some special fiddling with the memory map or the loader or something), add an ETH Phy and/or map some pins for a popular WiFi Module, configure whatever UARTs are still available and then some I2C and SPI. Man, that would be awesome.