So, this is more a less a quick brain dump from my NetBSD installations on my sparcstation 5 and Ultra 1. I used a Raspberry PI 3 for DHCP/rarpd/tftp/nfs.
I based my installations on the following guides:
Below I just added a few things I thought was missing or unclear from the guides.
At OK prompt, either start the netbooting with boot net or boot net:dhcp, either works usually.
For Sparc64 install (Ultra 1), when you are asked for the installation media and you choose “local media” then you need to type in :
Base Directory: /
Binary Set Directory: /sparc64/binary/sets/
I did not edit the part about source sets location.