Just as a point of information: the boot firmware is reasonably 
smart, so you can abbreviate the path by omitting the address 
specifcation when there is only one of a given device, e.g. instead of

/iommu@0,10000000/sbus@0,10001000/espdma@4,8400000/esp@4,8800000/sd@3,0:h

you could use:

/iommu/sbus/espdma/esp/sd@3,0:h

so long as your Sun only has one iommu, one sbus, one espdma on the 
sbus, etc. You only need the address information when you need to 
distinguish between two or more of a given device, at a given point 
in the path.

	Erik <fair@netbsd.org>