boot from eMMC with blank sd card

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You can't change boot order, SoC look first at SDCard, then eMMC, and last at SPI-NOR.

To make it boot from eMMC, the SDCard needs to be non-bootable, so that why I've said that "no u-boot sector should be present on SDCard".

You can erase it with :

dd if=/dev/zero of=/dev/mmcblk0 bs=1024 seek=8 count=512


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