Example 6.1. b_flashwrapper.s template

;************************************************************************/
; b_flashwrapper.s
; Sample board level wrapper code for RVD flash algorithms
;
; 27/3/2003 ARM Ltd.
; Revision: A
; Date: 21/03/2003
;
;************************************************************************/
;************************************************************************/
;* DEFINE MACROS AND EQUATES                                            */
;************************************************************************/
P_WIDTH   EQU     NumberofFlashROMs ; number of FlashROMs in parallel across bus.
WIDTH     EQU     FlashWidth        ; Define resultant width of flash.
                                    ; 32bit=4, 16bit=2, byte=1.
;************************************************************************/
;* DEFINE SMALL STACK AREA                                              */
;************************************************************************/
        AREA   FLASH_STACK, CODE
        DCD    0,0,0,0,0,0,0,0,0,0,0,0 ; 12 words for call depth
stack_top
;************************************************************************/
;************************************************************************/
;* FLASH_init - initialize the board (memory access controls, etc).     */
;************************************************************************/
;  This function is exported and called directly by RVD.
;
;  Should contain any board specific initialisation code.
;
;  RVD API register useage as follows
;  In: R1 will contain base of flash
;  Out: R0=status code   (0=OK, else error)
;  Scratch registers available for use in your code: R6,R7,R8.
;************************************************************************/
        AREA    FLASH_TEXT, CODE, READONLY
        EXPORT          FLASH_init
        ENTRY
FLASH_init
        ldr SP, = stack_top
;   ------------------------------------------------------------------- */
;  Your board specific code goes below
;
;  Examples include disabling watchdogs, enabling
;  chip selectors/enables to allow write to this memory, etc.
;   ------------------------------------------------------------------- */
;       not required for ARM Evaluator7T board
;        place_your_code_here
;   ------------------------------------------------------------------- */
;  end of board specific code
;   ------------------------------------------------------------------- */
        ;bl      check_status            ; check Flash status and return in R0
                                         ; not used for SST flash
        b       Local_init              ; finish init, then Stop on breakpoint
;************************************************************************/
;* Include the appropriate Flash algorithm here to do actual work       */
;************************************************************************/
        INCLUDE flash_algorithm_assembly_code ; include appropriate flash algorithm
;************************************************************************/
;* DEFINE BUFFER FOR WRITE/VERIFY                                       */
;************************************************************************/
        AREA BUFFER, NOINIT
buffer  % Size ; define area of RAM for RVD to buffer data in
               ; prior to writing to flash
        END