U-boot error (How to make it work without kernel)

Hello Guys,

I got bit into a trouble,
i have downloaded the u-boot, build and rkbin from radxa
and with this link i have followed to create the u-boot bin and ibt files so that i want to check just the boot is working fine i am getting this below error and after loading it is still in maskrom mode

image

i ahve used this for CM3-IO module
https://wiki.radxa.com/Rock5/guide/build-u-boot-on-5b
but failed.

Also thought i did something wrong, but even after using the u-boot bin and ibt file i am facng the same issue.
https://wiki.radxa.com/Rock3/install/spi-cm3io


U-Boot SPL board init
U-Boot SPL 2017.09-ga1f6fc00a0-210413 #ldq (Apr 13 2021 - 11:35:00)
unknown raw ID phN
unrecognized JEDEC id bytes: 00, 00, 00
Trying to boot from MMC2
MMC error: The cmd index is 1, ret is -110
Card did not respond to voltage select!
mmc_init: -95, time 10
spl: mmc init failed with error: -95
Trying to boot from MMC1
spl: partition error
SPL: failed to boot from all boot devices

ERROR ### Please RESET the board

Reset the board to bootrom

please let me out how to solve this issue