Mostly in the IEEE 1275 specification. Look at the "reg" and "assigned-address" properties, and the semantics of "map-in".
On SBus machines, the FCode of the SBus cards would created these properties indicating where the PIO space of video card would be, on PCI machines, the BARs will do this and be reflected in the "reg" and "assigned-address" properties.
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I started playing with the OpenFirmware(I got a SunBlade in the meanwhile). But i'm not able to get an instance of the SUNW,m64B, and as a matter of fact of nothing, as I get a Fast Data Access MMU Miss every time i try the open-dev command. I know I don't need an instance to get the .properties of the device, but I think that MUU miss couldn't be a good thing...