Topic: serial connection to hackerboard via bus pirate
Using the bus pirate to access the Chumby Hackerboard.
gnd to gnd
MOSI to Rx
MISO to Tx
Select mode "UART", 115200bps, Bits/Parity 8/none (default), a stop bit (default), default polarity, "normal" H=3.3V output (*not* default). Run the "Transparent UART bridge" macro (that's "(1)" on my bus pirate, other revisions may vary) for a typical interactive terminal - easiest to connect the bus pirate, set up the serial connection, then power up the chumby and watch it boot.