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how to access the DATA space of F2407,using C?

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I attach a interface chip (TL16C550) to F2407,and mapped to 0x9000~0x90ff of DATA space of F2407.Now I want to access the dedicated locations of TL16C550 to initialize, or configure it. But I don't know how to access the DATA space of F2407, using C.
I know, using #pragma DATA_SECTION can allocate variables into special DATA space, then access it. But , to access a variable is different from accessing an allocation.
Could you help me? Thanks!
 

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