Beagleboard:BeagleBone Black Capes


 * The BeagleBone Black essential is an original BeagleBone with three virtual capes:
 * Memory Cape for on board eMMC (using MMC signals P8[25:20] and P8[6:3])
 * HDMI Cape for on board video (using LCD signals P8[46:27])
 * Audio Cape for audio through HDMI (using AUDIO signals P9[31] and P9[29:28])
 * When adding a Cape to the BeagleBone Black, if the same signals are used for the on board virtual capes, then only one of these devices can be supported at a time.
 * Each cape is listed with a column to indicate if the cape uses any of the same signals as the virtual cape for each:
 * MMC signals P8[25:20] and P8[6:3]
 * LCD signals P8[46:27]
 * AUDIO signals P9[31] and P9[29:28]