I looked at the current state of affairs
https://wiki.netbsd.org/ports/riscv/#index4h2

and what people are actually working on
https://www.youtube.com/watch?v=RNHTYV4MI8Y

I don't think it will be possible to run #NetBSD on #Tangnano20k so quickly.

NetBSD/riscv

ISEVIC HDMI Output for Commodore 64 - The Oasis BBS

Install and tune the ISEVIC HDMI output for your Commodore 64 using a Tang Nano 20K FPGA and enjoy crisp 720p digital video.

The Oasis BBS
@splinedrive 's #riscv thing is running Linux on #tangnano20k . 🤣 But that's not the news, the news is that this is the work of a new #apicula that will allow support for the cool GW5A series #fpga!
Ladies and gentlemen, Himbaechel-#gowin supports #tangnano20k to the extent necessary for #riscv to function correctly (example attosoc). Hooray!
#apicula #sipeed #nextpnr #fpga