Booting NetBSD

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I managed to install NetBSD on eMMC by booting from an SD card with 9.3 arm64.img and running sysinst.

Now have trouble booting up the installed system. Tow-Boot on SPI complains

"Wrong image format for "source" command."
"Can't get kernel image!"

I reinstalled kernel just to be sure

Code:

install -o root -g wheel -m 555 netbsd-GENERIC64 /netbsd

and wrote u-boot into boot sector

Code:

dd if=/usr/pkg/share/u-boot/rksd_loader.img of=/dev/rld0 seek=64 conv=sync

Also copied everything in /boot of the SD card to /boot on eMMC.

Still no luck, the system won't boot.