Help with I/O mapping

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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