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Linux/AM5728: DFU flashing via SPL

Part Number: AM5728

Tool/software: Linux

I'm trying to load u-boot.img to eMMC via USB on my customboard, based on sitara am5728.
I've got only USB and eMMC boot modes.
I've loaded u-boot-spl.bin, as it describes in this guide .
But after loading it outputs following messages:

U-Boot SPL 2016.05-00304-g323bf10-dirty (Mar 28 2017 - 15:54:02)
DRA752-GP ES2.0
Trying to boot from MMC2
** First descriptor is NOT a primary desc on 1:1 **
Expected Linux image is not found. Trying to start U-boot

I've got two questions:
1. Does SPL checks currently setted boot mode from sysboot pins and changes it's u-boot loading mode, depending on this settings?
2. If it's right, why it attempts to boot from MMC2, when sysboot pins is setted on USB mode?