Leon Anavi was at the recent Tizen Developer Conference, and presented a session entitled Porting Tizen to open source hardware devices for beginners. He discusses Open Source hardware and provides details about the porting process, as well as guidelines on how to select appropriate developer boards and to build DIY devices, like the Tizen tablet and Tizen laptop that he showed off.
Slides
Video
https://www.youtube.com/watch?v=ZeAL7Mi-wQw
You can also find further information on his post How to build a Tizen laptop with open source hardware components.