Xdata Variables not accessable - Keil forum - Support forums

Thanks for the help.
Here is the modified STARTUP.A51, with which the code hangs after executing a couple of functions. I am sorry for asking to analyze the whole file.
-RD
$NOMOD51

STACKSIZE   EQU 0x85                    ; must not exceed IDATA SEG

;------------------------------------------------------------------------------
;
;  User-defined <h> Power-On Initialization of Memory
;
;  With the following EQU statements the initialization of memory
;  at processor reset can be defined:
;
; <o> IDATALEN: IDATA memory size <0x0-0x100>
;      Note: The absolute start-address of IDATA memory is always 0
;            The IDATA space overlaps physically the DATA and BIT areas.
IDATALEN        EQU     0 ;080H
;
; <o> XDATASTART: XDATA memory start address <0x0100-0xFFFF>
;      The absolute start address of XDATA memory
;XDATASTART      EQU     0x0100
XDATASTART      EQU     0x0
;
; <o> XDATALEN: XDATA memory size <0xE000-0xFD55>
;      The length of XDATA memory in bytes.
;XDATALEN        EQU     0x1000
XDATALEN        EQU     0x0
;
; <o> PDATASTART: PDATA memory start address <0x0-0xFFFF>
;      The absolute start address of PDATA memory
PDATASTART      EQU     0x00
;
; <o> PDATALEN: PDATA memory size <0x0-0xFF>
;      The length of PDATA memory in bytes.
PDATALEN        EQU     0H
;
;</h>
;------------------------------------------------------------------------------
;
;<h> Reentrant Stack Initialization
;
;  The following EQU statements define the stack pointer for reentrant
;  functions and initialized it:
;
; <h> Stack Space for reentrant functions in the SMALL model.
;  <q> IBPSTACK: Enable SMALL model reentrant stack
;      Stack space for reentrant functions in the SMALL model.
IBPSTACK        EQU     0       ; set to 1 if small reentrant is used.
;  <o> IBPSTACKTOP: End address of SMALL model stack <0x0-0xFF>
;      Set the top of the stack to the highest location.
IBPSTACKTOP     EQU     0xFF +1     ; default 0FFH+1
; </h>
;
; <h> Stack Space for reentrant functions in the LARGE model.
;  <q> XBPSTACK: Enable LARGE model reentrant stack
;      Stack space for reentrant functions in the LARGE model.
XBPSTACK        EQU     1       ; set to 1 if large reentrant is used.
;  <o> XBPSTACKTOP: End address of LARGE model stack <0x0-0xFFFF>
;      Set the top of the stack to the highest location.
XBPSTACKTOP     EQU     0x1EFF +1 ; 0x1EFF +1
; </h>
;
; <h> Stack Space for reentrant functions in the COMPACT model.
;  <q> PBPSTACK: Enable COMPACT model reentrant stack
;      Stack space for reentrant functions in the COMPACT model.
PBPSTACK        EQU     0       ; set to 1 if compact reentrant is used.
;
;   <o> PBPSTACKTOP: End address of COMPACT model stack <0x0-0xFFFF>
;      Set the top of the stack to the highest location.
PBPSTACKTOP     EQU     0xFF +1     ; default 0FFH+1
; </h>
;</h>
;------------------------------------------------------------------------------
;
;  Memory Page for Using the Compact Model with 64 KByte xdata RAM
;  <e>Compact Model Page Definition
;
;  Define the XDATA page used for PDATA variables.
;  PPAGE must conform with the PPAGE set in the linker invocation.
;
; Enable pdata memory page initalization
PPAGEENABLE     EQU     0       ; set to 1 if pdata object are used.
;
; <o> PPAGE number <0x0-0xFF>
;  uppermost 256-byte address of the page used for PDATA variables.
PPAGE           EQU     0
;
; <o> SFR address which supplies uppermost address byte <0x0-0xFF>
;  most 8051 variants use P2 as uppermost address byte
PPAGE_SFR       DATA    0A0H
;
; </e>
;------------------------------------------------------------------------------

; Standard SFR Symbols
;
ACC     DATA    0E0H
B       DATA    0F0H
SP      DATA    81H
DPL0    DATA    82H
DPH0    DATA    83H
DPL1    DATA    84H
DPH1    DATA    85H
DPS     DATA    92H

                NAME    ?C_STARTUP


?C_C51STARTUP   SEGMENT   CODE


?STACK                                 SEGMENT   IDATA
                                                                RSEG     ?STACK
                                                                DS           STACKSIZE


                EXTRN CODE (?C_START)
                PUBLIC  ?C_STARTUP

                CSEG    AT      0
?C_STARTUP:     LJMP    STARTUP1

                RSEG    ?C_C51STARTUP

STARTUP1:

IF IDATALEN <> 0
                MOV     R0,#IDATALEN - 1
                CLR     A
IDATALOOP:      MOV     @R0,A
                DJNZ    R0,IDATALOOP
ENDIF

IF XDATALEN <> 0
                MOV     DPTR,#XDATASTART
                MOV     R7,#LOW (XDATALEN)
  IF (LOW (XDATALEN)) <> 0
                MOV     R6,#(HIGH (XDATALEN)) +1
  ELSE
                MOV     R6,#HIGH (XDATALEN)
  ENDIF
                CLR     A
XDATALOOP:      MOVX    @DPTR,A
                INC     DPTR
                DJNZ    R7,XDATALOOP
                DJNZ    R6,XDATALOOP
ENDIF

IF PPAGEENABLE <> 0
                MOV     PPAGE_SFR,#PPAGE
ENDIF

IF PDATALEN <> 0
                MOV     R0,#LOW (PDATASTART)
                MOV     R7,#LOW (PDATALEN)
                CLR     A
PDATALOOP:      MOVX    @R0,A
                INC     R0
                DJNZ    R7,PDATALOOP
ENDIF

IF IBPSTACK <> 0
EXTRN DATA (?C_IBP)

                MOV     ?C_IBP,#LOW IBPSTACKTOP
ENDIF

IF XBPSTACK <> 0
EXTRN DATA (?C_XBP)

                MOV     ?C_XBP,#HIGH XBPSTACKTOP
                MOV     ?C_XBP+1,#LOW XBPSTACKTOP
ENDIF

IF PBPSTACK <> 0
EXTRN DATA (?C_PBP)
                MOV     ?C_PBP,#LOW PBPSTACKTOP
ENDIF

                MOV     SP,#?STACK-1

; This code is required if you use L51_BANK.A51 with Banking Mode 4
;<h> Code Banking
; <q> Select Bank 0 for L51_BANK.A51 Mode 4
#if 0
;      Initialize bank mechanism to code bank 0 when using L51_BANK.A51 with Banking Mode 4.
EXTRN CODE (?B_SWITCH0)
                CALL    ?B_SWITCH0      ; init bank mechanism to code bank 0
#endif
;</h>
                LJMP    ?C_START

                END