www.pudn.com > JPEGMotion.rar > boot.asm

            .title  "Flash bootup utility for DM642 EVM" 
            .option D,T 
            .length 102 
            .width  140 
 
COPY_TABLE  .equ    0x90000400 
EMIF_BASE   .equ    0x01800000 
 
            .sect ".boot_load" 
            .global _boot 
 
_boot:       
;************************************************************************ 
;* Debug Loop -  Comment out B for Normal Operation 
;************************************************************************ 
 
            zero B1 
_myloop:  ; [!B1] B _myloop   
            nop  5 
_myloopend: nop 
 
;************************************************************************ 
;* Configure EMIF 
;************************************************************************ 
 
        mvkl  emif_values, a3  ; load pointer to emif values 
        mvkh  emif_values, a3 
         
        mvkl  EMIF_BASE, a4    ; load EMIF base address 
        mvkh  EMIF_BASE, a4 
 
        mvkl  0x0009, b0       ; load number of registers to set 
        mvkh  0x0000, b0 
 
emif_loop: 
        ldw   *a3++, b5        ; load register value 
        sub   b0,1,b0          ; decrement counter 
        nop   2 
 [ b0]  b     emif_loop 
        stw   b5, *a4++        ; store register value 
        nop   4   
 
;**************************************************************************** 
;* Copy code sections 
;**************************************************************************** 
        mvkl  COPY_TABLE, a3   ; load table pointer 
        mvkh  COPY_TABLE, a3 
 
        ldw   *a3++, b1        ; Load entry point 
 
copy_section_top: 
        ldw   *a3++, b0        ; byte count  
        ldw   *a3++, a4        ; ram start address 
        nop   3 
 
 [!b0]  b copy_done            ; have we copied all sections? 
        nop   5 
 
copy_loop: 
        ldb   *a3++,b5 
        sub   b0,1,b0          ; decrement counter 
 [ b0]  b     copy_loop        ; setup branch if not done 
 [!b0]  b     copy_section_top 
        zero  a1 
 [!b0]  and   3,a3,a1 
        stb   b5,*a4++ 
 [!b0]  and   -4,a3,a5         ; round address up to next multiple of 4 
 [ a1]  add   4,a5,a3          ; round address up to next multiple of 4 
 
;**************************************************************************** 
;* Jump to entry point 
;**************************************************************************** 
copy_done: 
        b    .S2 b1 
        nop   5 
 
emif_values: 
        .long 0x00052078      ; GBLCTL 
        .long 0x73a28e01      ; CECTL1 (Flash/FPGA) 
        .long 0xffffffd3      ; CECTL0 (SDRAM) 
        .long 0x00000000      ; Reserved 
        .long 0x22a28a22      ; CECTL2 
        .long 0x22a28a22      ; CECTL3 
        .long 0x57115000      ; SDCTL 
        .long 0x0000081b      ; SDTIM (refresh period) 
        .long 0x001faf4d      ; SDEXT