@Autodesk Ember 3D printer: “The main board integrates a clone of the BeagleBone Black and an AVR-based motor controller. The major changes from a stock BeagleBone are the addition of a USB hub (to support the included WiFi adapter), double the flash memory (8GB), and improved power management.”
http://learn.ember.autodesk.com/blog/ember-open-source-electronics-and-firmware