I just was playing around a little running the Carambola SoC stand alone (without dev-board). The picture blow shows what needs to be connected to boot the Carambola, access it through serial line (by using a TTL USB to serial converter), and optionally connect USB (I used a web cam):
Some notes about power consumption:
- You need to supply at least 300mA, otherwise the Carambola is starving.
Some notes about the USB connection:
- For using USB, 5V has to be provided to pin 21 (when not using USB, there is no need to provide 5V).
- UPHY (pin 40) needs to be grounded to tell the USB controller to run in master mode.
- No ESD protection when connecting as described! Thus, I recommend not to hot-plug devices when using this unprotected approach!