I recently made several improvements to the community Beaglebone BSP available on Codeplex.

The BSP now support all three serial communication ports. These ports are 2-wire (Rx and TX only) and available on the expansion P9 connector. Also added support for the third instance of the SDHC controller. These, along with the I2C and SPI bus are also available on the expansion connectors. I have included managed (C#) test programs to exorcise these buses. 

Added a define file for the TPS65217 PMIC (Power Management IC). This PMIC has some nice features, like built in LCD backlight support and a Li battery charger. I have battery support working and will release additional code soon. Support for WEC7 and WEC2013.