Here's a snippet from way back then. If I recall correctly, stability wasn't there with 40+ usbs. I eventually went to a linux nettop controller - it ran 118 usb miners and still runs 24/7 almost a year later (usbs are long gone). The BBB is collecting dust. I'm sure RasbPi would be in the same dusty box if I owned one.
Update and bump for this cool platform.
I've been playing around with the BBB and the mineninja image and through dumb luck managed to get cgminer 3.4.3 to compile and run.
...snip
Neither libudev nor udev-dev would install, seems to be an issue with BBB or Angstrom. After banging my head against the desk trying to figure out how to install libudev, I found a google group post for a BBB libudev problem. The BBB group post recommended systemd-dev. After I tried it, smooth sailing.
opkg install systemd-dev
libsub-1.0.16-rc10 - http://sourceforge.net/projects/libusb/files/libusb-1.0/libusb-1.0.16-rc10/
Compile CGminer 3.4.3. ...snip...
YMMV. Have a backup. I messed with udev and libudev for quite a while figuring this out. I have not reflashed the BBB to recreate the solution.
Seemed pretty happy around 50-55 erupters. Really dogged out over 60 and crashed at 66. I ran 48 all night on the same hub which previously gave me problems earlier in this thread.
My experience - you can make the BBB work. But a 50 watt ubuntu box will work better.