BeagleBone Black: boot from eMMC: «Card did not respond to voltage select»

[Sergey Manucharian]

Does anybody know why when I run FreeBSD 11.1 or 12.0 form eMMC I get several
hundreds of lines:

Card did not respond to voltage select!

Eventually FreeBSD boots and works properly. The same BBB boots fine from an SD card.
I'm using "official" images.

Those warnings start right after u-boot jumps to ubldr.bin address.
They are not harmful, just annoying.

Thanks for advises,
Sergey