Hi, I was wondering if I should be concerned about this crusty coating on the bottom of my new UDOO Quad: http://i.imgur.com/adHHkJU.jpg? I primarily use the SAM3X and haven't encountered any issues thus far (although it seems to be near the ethernet transceiver chip).
Get a Q-tip with some rubbing alcohol and see if you can make it go away. I suspect it is left over flux. After it is gone, look for any kind of corrosion or pits in the copper traces. If all OK, you are done!
