@rfried, no, eMMC will continue to fail on the db410c until the fix I mentioned is merged.
Also http://git.denx.de/?p=u-boot.git;a=summary updates more frequently than its github clone.
you can find the required patch already merged in http://git.denx.de/?p=u-boot/u-boot-mmc.git;a=summary
it is just a matter of time until it is merged back to the master branch
http://git.denx.de/?p=u-boot/u-boot-mmc.git;a=search;s=Jorge+Ramirez-Ortiz;st=author