If you have a 64 bit Mac and you want to connect over /dev/tty.usb to the BB, you need to install the 64 bit FTDI driver: here. As of this post, it was version 2.218 for Mac OS X, 64 bit. Then you should be able to access the serial console as discussed in the README.
Unfortunately, I just got this as the new BeagleBone Black was announced yesterday. If I mysteriously fry this BB I guess I won’t be too upset when I have to get the BB Black…
- BeagleBone Black packs 1GHz ARM CPU, 512MB RAM for just $45 (video) (engadget.com)
- How-To: Get Started with the BeagleBone (makezine.com)
- BeagleBone Black Has Arrived (makezine.com)