startup.a51

Hello,
I'm using a 8051 chip with 2K of internal data RAM (T89C51SND1). (I'm not using any external memory). May I know how should I set the IDATALEN, XDATASTART, XDATALEN variable in the startup.a51 file?
Is this extended internal memory (after 256bytes) considered as IDATA or XDATA?
How should I address it in C code?
Regards
KC

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