why can i select both PHYSMAP and MULTI_PHYSMAP?

[Robert P. J. Day]

  patched my 2.6.11.7 kernel tree with the latest mtd CVS to get the
mphysmap.c and i'm a bit confused.  in the

  Mapping drivers for chip access -->

menu, i can apparently select, simultaneously,

  <*> CFI Flash device in physical memory map
  <*> multiple CFI Flash devices in physical memory map

this seems contradictory, especially since i can deselect the first
while still select the second.  am i misreading what these mean?  or
is this some non-intuitive stuff to be backward-compatible?

rday