ioremap addresses

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hi,
      i have this doubt regarding the addresses returned by
ioremap.
  i mapped my devices's registers using ioremap. again when i try to
retrieve the physical address from the virtual address got from ioremap
using __pa(va) i see that the physical address is not the same which i
gave to ioremap function !!
  
  can anybody explain this please.
  
  regards
  Srinivas Bakki

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