eMMC compatibility for "ROCK 3a" and "Rock pi 4"

Is Rock 3a compatible with eMMC module v1.2?

I have 3 such modules and each gives an error:

=> mmc dev 2
MMC error: The cmd index is 0, ret is -110
mmc_init: -110, time 33

Sorry to bring up this topic. I am a beginner with radxa boards.

UPD: Yes, they are compatible. I managed to make it work, but it’s more like a randomly cast magic spell.