this appears to be caused by eeh's bus_space_mmap() changes for the sparc*
ports that also changed the sparc port's bus_addr_t to a 64 bit value..
this then caused an `int' vs `u_int64_t' comparison to sign extend the
address of e000.0000 causing it to not match.  indeed, my ss20 just told me:

	root on sd0a dumps on sd0b


i will commit my fixes and close the PR shortly.


.mrg.