Unable to read file hello_world.elf

I’m trying to load hello_world.elf to M4 through u-boot like here but u-boot throws this error:

Colibri iMX7 # fatload mmc 0:1 ${loadaddr} hello_world.elf
reading hello_world.elf
** Unable to read file hello_world.elf **

The sd card is working ok.

1GB version of colibri im7 uses eMMC instead of NAND flash. Number 0 is used for internal eMMC.