"pidin map" will only show a single "Mapped Phys Memory".  This occurs  on x86 and PPC (600).  I have a number of 
drivers that map multiple regions - usually a control region and a data region but only a single region is reported.  
 A nand file system with control registers at 0xe0005000 (4Kb) and data at 0x10000000 (256Mb).  But with 6.4.0/1 only 
one region is shown

6.4.0 and 6.4.1

# pidin -Pfs-yaffs map
     pid tid name               prio STATE            code  data        stack
  131095   1 sbin/fs-yaffs       10r RECEIVE          272K  652K  8192(516K)*
             Mapped Phys Memory @80100000 (e0005000)        256M  S
#
# pidin -Pfs-yaffs me
     pid tid name               prio STATE            code  data        stack
  131095   1 sbin/fs-yaffs       10r RECEIVE          272K  652K  8192(516K)*
            /dev/mem           @80100000 (       0)        256M
#


6.3.2
# pidin -Pfs-yaffs me
     pid tid name               prio STATE           code  data         stack
    8203   1 proc/boot/fs-yaffs  10r RECEIVE          260K  656K  8192(516K)*
            mem                @80100000             4096  4096
            mem                @80102000             256M
#

btw just tried the latest sin and it has the same problem.  a single mem region only