Help with I/O mapping

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Good day!
I'm working with MPC8349 CPU and Linux 2.6.11.
My board has a FLASH and DPRAM memories in addition to SDRAM DDR and I'd
like to map these I/O areas to user space using mmap().
Mmap() call is returned a pointer but it's not valid pointer to on-board
DPRAM memory.
Should I set some mappings in Linux sources for DPRAM and how can I do so?
Thanks for advice!

Best regards,
Miloserdin Oleg

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