no Boot screen.
flashed SD-Card, mounted Samsung 980Pro 1TB NVMe ssd
adjusted jumpers — can boot from SD but no luck with NVMe image (202306)
i assume i need to use the USB2TTL connector (part of the bundle) to displaying the boot messages. unfortunately there is nothing to be found in the docs on how to connecting. (the USB2TTL connector has 4 pins (green, black, red and white)
With serial (if it is 3.3 volt) it is safest to use only 3 wires ground(UART)==ground(VisionFive 2), TX(serial)=>RX(VF2) and RX(UART)<=TX(VF2).
It is best to never connect the voltage wire (+3.3 volt and especially not +5 volt), since the board is powered up already, and there is no way that the wire used could carry enough current to fully power up the board. And permanent damage will occur if the GPIO pins (except for the +5V) are accidentally connected to 5 volts.
But an even safer option, if you only want to see the output, would be to use only 2 wires (there is never any voltage generated by the USB2TTL connector entering the VF2 board, so even if the TX pin on the USB2TTL was 5 volt TTL it can not cause any damage, if it is not connected):