OpenBSD-7.1beta aarch64 on RPI4 black screen after "Booting sd0a:"

Hi list,

Copied 7.1beta latest snapshot to 256Gb MicroSD card and trying to boot RPI4. No external USB disks attached except MicroSD.

There is no any text after "Booting sd0a: ...", but monitor stays in normal power mode, just no video output with text kernel messages.

I'm not sure is it normal or not, because I try to run OpenBSD first time on latest RPI.

Does it intended behavior? Please advice.

Martin