Share variables between verilog file and niosII application file(.c file)

Sorry, I have one doubt over here,

Implementing MM slave will allow me to share maximum 16 regs of HDL. What if i want to fill 10Mbytes of SDRAM location in HDL and later on use it in NiosII application?

Will the MM slave still be the answer to this.

I doubt this because in MM slave i found only 16 regs were available.

In my application, I want to fill the video data (Around 10Mbytes) in SDRAM using HDL and later on retrieve the Data from SDRAM in niosII application for sending it to external world.

-Jagdish