> "There are so many SBCs these days it's hard to enumerate all of them, but this board looks more open than RPi. I think it uses Vivante/Etnaviv graphics. http://www.imx6rex.com/open-rex/ "

That's over 5x the price for the cheapest model (iMX6 OpenRex SBC Basic, €199 in quantity 1, http://www.voipac.com/#category3 ), at that price you'd be better off getting an x86 board.

> "Unfortunately, the current end result seems to be a Linux that doesn't even have support for USB or ethernet."

You forgot a word at the end of that statement... " yet". Furthermore, expensive outliers like the OpenRex aside, it's still currently more open than its main competition.