Hi, what logic voltage is the udoo compatable with? On the documet it says to be careful with legacy shields that use 5v logic but on the main website it says its operating voltage is 5v not 3.3v I'm seeing mixed and conflicting information everywhere. Can the udoo take 5v logic coming from another board (a shield, another arduino, etc..) ? What is the Udoo's operating voltage? Does operating voltage mean it can take 5v input 5vout if the operating voltage is 5? Thanks!