Just a quick post for anyone who may find it helpful. From what I have found by lots of searching it appears that the hexadecimal values in board-sholes.c represent voltage by the following formula: (value as decimal) * 12.5 + 600 mV. This seems to make sense. Stock speed of 550 mhz uses 0x38 as the voltage value. 56 * 12.5 + 600 mV = 1300 mV This *could* be wrong.. I'm not entirely certain and if anyone knows differently please tell me. I found this info here https://gforge.ti.com/gf/project/omapandroid/tracker/?action=TrackerItemEdit&tracker_item_id=492