There is a bug in the pinout for the Olimex USB-Serial-Cable in the section BeagleBone_Black_Serial
Fragment of a discussion from User talk:Wmat
It is protected, tried just now.
You're correct, any pages in the Beagleboard: namespace are indeed protected. I've gone ahead and corrected the error.
Still can't http://i.imgur.com/UxOn7j1.png