Just a link to my GitHub repo for my SBusFPGA project.
Still some work needed to improve the drivers in NetBSD, but the micro-sd card, the 256 MiB RAM disk (for e.g. swap), the USB OHCI controller, the True Random Number Generator and a crypto accelerator are now working. There's even bw2/cg3/cg6 emulation, but the output has a very limited color range (only 2 bits per channel) so it's for prototyping - or if you want a 1920x1080 black-and-white VGA display on your SPARCstation