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  I take it that the probe routines should call bus_space_unmap on
allocated things if they fail to find a card?
  What is an invalid value for bus_space_handle_t? 0? ~0? 

  Should a probe routine unmap everything and let the attach routine
map it back in?

   :!mcr!:            |  Network security consulting and 
   Michael Richardson |      contract programming
 WWW: mcr@sandelman.ottawa.on.ca. PGP key available.

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