Here are some concise instructions for getting OpenBSD 7.3-current running on a StarFive VisionFive 2 (v1.3B, though from other reports referenced below, it sounds like the v1.2 boards can also be made to work).
You will need:
- An SD card of at least 1GB
- An eMMC module attached to the board (though see below for a variation that should work to install directly to sd card)
- Internet access
- A USB TTL serial adapter that supports 3.3V (some of these support multiple voltages, but if yours only supports other voltages and not 3.3 it will either not work or damage your board!)