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Using on-chip XRAM in P89LPC932

Hi,

I'm using P89LPC932 chip and I have the following question:
how can I access to on-chip ram?

I've check the checkbox "Use on-chip ram"
of menu:

Options for Target --> Target

in uvision3 IDE and I've written the following code

#include <stdlib.h>
#include <absacc.h>
char *BuffTX;
char Var = 0x00;

main {

//Reserve memory
init_mempool (&XBYTE [0x0], 0x200);

BuffTX = calloc (10, sizeof (char));
if (BuffTX == NULL)
{
 //Allocating failed
 ...
} else
   {
     *BuffTX = 0x01;
      Var = *BuffTX;
    }

The variable "Var" is always zero!!

Thanx in advance

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