external memory configuration/support

Hello,

We are using the AT89c51rd2 micro-controller for a mass production product.
We are currently using both external flash and RAM memories(RAM = 64K, Flash = 1MB).
This architecture are working as expected.

We are requested to extend our external RAM memory support to 128KB (additional 64KB are required). For that matter we made a hardware modification to our current hardware by connecting P1.2 GPIO as an additional address line(A16) to a 128KB external memory RAM chip.
In addition we modified the L51_BANK.A51 file, for supporting this hardware modification.
Unfortunately, after modifying the L51_BANK.A51 file, it seems that the application is not started(main function is not called).
The following lines describes the changes which have been made to the L51_BANK.A51 file:

; $NOCOND DEBUGPUBLICS
;------------------------------------------------------------------------------
; This file is part of the BL51 Banked Linker/Locater package
; Copyright KEIL ELEKTRONIK GmbH 1991
; Version 1.2
;------------------------------------------------------------------------------
;************************ Configuration Section *******************************
?B_NBANKS EQU 32 ; Define max. Number of Banks *
; *
?B_MODE EQU 1 ; 0 for Bank-Switching via 8051 Port *
; ; 1 for Bank-Switching via XDATA Port *
; *
IF ?B_MODE = 1; *
;-----------------------------------------------------------------------------*
; if ?BANK?MODE is 1 define the following values *
; For Bank-Switching via XDATA Port define XDATA Port Address / Bits *
?B_XDATAPORT EQU 0FFE5H ; default is XDATA Port Address 0FFFFH *
?B_BANKMASK EQU 0F0H ; the bank mask (4 bits) *
?B_FIRSTBIT EQU 2 ; default is Bit 0 *
?B_BANKS EQU 2 ; *
?B_XDATAIO EQU 1 ; *
?B_PORT EQU P1 ; *
;-----------------------------------------------------------------------------*
ENDIF; *
; *
;******************************************************************************

Please advice,

Avner