Look at all the hints and tips in this thread, and also check this thread. If you can't figure out what wrong with all of that, I might be able to make something out of your u-boot output.
Other than that, I can probably not help you.
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PBI-M3 new image:ubuntu-mate-16.04-desktop-armhf-raspberry-pi-bpi-m3-sd-emmc.img 2016-07-21
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