> Does that mean that it's not possible to boot a bone from SD card if there
> is no uboot in eMMC? Or is eMMC uboot needed to provide logic that overrides
> the bootrom search order, bypassing valid boot code that is found before
> reaching the SD card?

microSD is after eMMC.  The bootrom is only looking for a simple magic
header, if it finds the magic header it jumps to that code. Otherwise
it just moves on to the next supported bootable media type.

Regards,

-- 
Robert Nelson
https://rcn-ee.com/

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