Sun3 doesn't have OF
When I was first developing Open Boot for the SPARCstation-1, I was also simultaneously trying to do it for a Sun-3 system that was being built at the same time.
It proved to be too much to do both jobs at the same time, especially in light of all the hardware debugging that is part of a new system bringup. So I gave up on Sun 3 and just focused on SS-1.
That particular Sun-3 machine never sold very well, while the SS-1 was very popular. That was Sun's last 680x0 machine.
Personally, I think that continuing to support Sun-3 in Linux is not useful in a practical sense. To the extent that supporting long-obsolete platforms and devices makes the job harder for current systems, it is actually harmful. Portability and generality is good in some theoretical "rightness" sense, but there are practical limits. Code can become so heavily layered that approaching it requires a huge commitment of effort to learn all the artificial layers. Sometimes you have to prune the dead branches so the living ones can get light and air.
Taking this one step further, I don't see any real good reason to continue supporting Sun4 going forward. I got rid of my Sun4 systems long ago because it was just too hard to keep them working - after having used them long after most people had moved on. Dropping Sun3 and Sun4 eliminates all vestiges of the sunmon interface and also allows dropping support for OBP version 1, which only shipped on SS1-class machines - the first machines in the Sun4c subclass.
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