[BH] Issues booting from eMMC with NON-BOOTABLE SD card inserted

[Boern]

I think it's looking for u-boot somewhere in the first MB or so of the card. If you had an OS on there and just deleted everything from the partitions u-boot might still be on there. You have to overwrite everything with zeroes, i think 8k from the start to the start of the first partition.
Something along the lines of

Code:

dd if=/dev/zero of=/dev/mmcblk0 bs=8k seek=1 count=64

will probably be enough.