Yesterday I was playing around the Texas Instruments 4.4 real-time kernel. After installing the image it turned out the script copying the contents of the SD card to the eMMC script was broken.
After some poking around, and debugging I found the source of the mystery, and opened an issue with the solution.
https://github.com/RobertCNelson/boot-scripts/issues/20
Just after some hour, RobertCNelson, the maintainer of everything in the BeagleBone Black project issued a fix. That was fast!
