efficient memcpy of far registers

Dear colleagues,

we are using the TINI DS80C400 platform and the KEIL PK51 development tools.
We would like to perform a fast memcpy of some physical CAN registers located in far memory to a buffer also located in far memory.

We use the following code lines:

#pragma moddp2
#include "absacc.h"

unsigned char far *SrcPtr;
unsigned char far *DestPtr;

SrcPtr = &FVAR(unsigned char, 0xFFDBF7);
/* physical register COM15D0 */
/* or alternatively: SrcPtr = (void far*)0xFFDBF7; */
DestPtr = ...;

memcpy(DestPtr, SrcPtr, 8);
/* should copy 8 bytes */

But it does not work!
What's wrong here?

Thanks for any hint.

Raoul