For those of you who have a 96Boards UART adapter board (Sonic Screwdriver), I've written a user guide and the design files are available on the Linaro git tree.
https://docs.google.com/document/d/1x3g4mfZJ2GxHCUYXp_O-ShwlbhJE2bMRtjcyRPFD...
https://git.linaro.org/people/grant.likely/96boards-uart.git
g.