problem in Writing EPCS64 Through FPGA

Hello,

I have a Cyclone III board with EPCS64 on board. I am implementing the remote update. I want to write the application image at particular address (e.g. 0x3D0000) in EPCS.

I have generated .rpd file (sof to pof and then pof to rpd) of the application image.

From the map file generated the application image size is 3.5MB.

But the .rpd file is 8MB so i am having difficulty in programming the only application image in EPCS64

how i will get the exact size .rpd file