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The default system console is on the TTL serial interface on the TXD/RXD/GND pins of the https://pinout.xyz/ header on the board. It will be helpful to obtain an adapter (e.g. CP2102 USB-UART). If you have one, attach it to the pins and a computer; a command such as "cu -l cuaU0 -s 115200" (assuming cuaU0 is your serial port device) should connect you to the board's console. If not, note that once the kernel has started running, by default you will only see output on the serial console. To switch to displaying on the monitor instead, watch for the OpenBSD BOOTAA64 "boot>" prompt, and type "set tty fb0".
"Alternatively the system can be booted using UEFI firmware found at https://github.com/pftf/RPi4. Follow their instructions to install to an SD card and run the OpenBSD installer from USB. v1.21 is known to work; some newer versions may have problems."