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startup file problem using micro 80C51SND1C

We are using microcontroller 80C51SND1C in my project and I'm using 2 512KB RAM and 2 512 KB Flash Memory for code in the first I'm putiing my Bootloader . What changes I have to do in the default startup file. I'm using Large memroy model so to save my data in External RAM whether I have to use 'far' keyword with variable body declaration. please guide ... If anybody have exp of 80C51SND1C microcontroller