tms320c6000价格_tms320c6000_tm320c6000网盘(3)

下面的代码段名.boot_load，你将在之后的cmd文件中看到它。

代码首先对EMIF进行初始化，然后在copy_section_top中读取用户程序的段信息（段的Flash加载地址，段的RAM运行地址以及段的长度），在copy_loop中执行循环拷贝操作。

;A;
;  ======== File: boot_c671x.s62 ========
;
            .title  "Flash bootup utility"

; global EMIF symbols defined for the c671x family
            .include        boot_c671x.h62

; Address of the generated boot-table
user_size      .equ  0x00001798
user_ld_start  .equ  0x90000400
user_rn_start  .equ  0x00000400

            .sect ".boot_load"
            .global _boot

            .ref _c_int00

_boot:      
;************************************************************************
;* DEBUG LOOP -  COMMENT OUT B FOR NORMAL OPERATION
;************************************************************************

            zero B1
_myloop:  ; [!B1] B _myloop  
            nop  5
_myloopend: nop

;************************************************************************
;* CONFIGURE EMIF
;************************************************************************

        ;****************************************************************
        ; *EMIF_GCTL = EMIF_GCTL_V;
        ;****************************************************************

            mvkl  EMIF_GCTL,A4    
      ||    mvkl  EMIF_GCTL_V,B4

            mvkh  EMIF_GCTL,A4
      ||    mvkh  EMIF_GCTL_V,B4

            stw   B4,*A4

        ;****************************************************************
        ; *EMIF_CE0 = EMIF_CE0_V
        ;****************************************************************

            mvkl  EMIF_CE0,A4       
      ||    mvkl  EMIF_CE0_V,B4     

            mvkh  EMIF_CE0,A4
      ||    mvkh  EMIF_CE0_V,B4

            stw   B4,*A4

        ;****************************************************************
        ; *EMIF_CE1 = EMIF_CE1_V (setup for 8-bit async)
        ;****************************************************************

            mvkl  EMIF_CE1,A4       
      ||    mvkl  EMIF_CE1_V,B4

            mvkh  EMIF_CE1,A4
      ||    mvkh  EMIF_CE1_V,B4

            stw   B4,*A4

        ;****************************************************************
        ; *EMIF_CE2 = EMIF_CE2_V (setup for 32-bit async)
        ;****************************************************************

            mvkl  EMIF_CE2,A4       
      ||    mvkl  EMIF_CE2_V,B4

            mvkh  EMIF_CE2,A4
      ||    mvkh  EMIF_CE2_V,B4

            stw   B4,*A4

        ;****************************************************************
        ; *EMIF_CE3 = EMIF_CE3_V (setup for 32-bit async)
        ;****************************************************************

      ||    mvkl  EMIF_CE3,A4    
      ||    mvkl  EMIF_CE3_V,B4     ;

            mvkh  EMIF_CE3,A4
      ||    mvkh  EMIF_CE3_V,B4

            stw   B4,*A4

        ;****************************************************************
        ; *EMIF_SDRAMCTL = EMIF_SDRAMCTL_V
        ;****************************************************************
      ||    mvkl  EMIF_SDRAMCTL,A4      
      ||    mvkl  EMIF_SDRAMCTL_V,B4    ;

            mvkh  EMIF_SDRAMCTL,A4
      ||    mvkh  EMIF_SDRAMCTL_V,B4

            stw   B4,*A4

        ;****************************************************************
        ; *EMIF_SDRAMTIM = EMIF_SDRAMTIM_V
        ;****************************************************************
      ||    mvkl  EMIF_SDRAMTIM,A4      
      ||    mvkl  EMIF_SDRAMTIM_V,B4    ;

            mvkh  EMIF_SDRAMTIM,A4
      ||    mvkh  EMIF_SDRAMTIM_V,B4

            stw   B4,*A4

        ;****************************************************************
        ; *EMIF_SDRAMEXT = EMIF_SDRAMEXT_V
        ;****************************************************************
      ||    mvkl  EMIF_SDRAMEXT,A4      
      ||    mvkl  EMIF_SDRAMEXT_V,B4    ;

            mvkh  EMIF_SDRAMEXT,A4
      ||    mvkh  EMIF_SDRAMEXT_V,B4

            stw   B4,*A4

;****************************************************************************
; copy sections
;****************************************************************************
        mvkl  copyTable, a3 ; load table pointer
        mvkh  copyTable, a3

        ; ldw   *a3++, b1     ; Load entry point

copy_section_top:
        ldw   *a3++, b0     ; byte count 
        ldw   *a3++, b4     ; load flash start (load) address
        ldw   *a3++, a4     ; ram start address
        nop   2

 [!b0]  b copy_done         ; have we copied all sections?
        nop   5

copy_loop:
        ldb   *b4++,b5      ; fetch from flash
        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++      ; store to ram
 [!b0]  and   -4,a3,a5
 [a1]   and   4, a5,a3

;****************************************************************************
; jump to entry point
;****************************************************************************
copy_done:
        mvkl .S2 _c_int00,b0
        mvkh .S2 _c_int00,b0
        b    .S2 b0
        nop   5

copyTable: 

            ; count
            ; flash start (load) address 
            ; ram start (run) address

            ;; .text
            .word user_size
            .word user_ld_start
            .word user_rn_start    

            ;; end of table
            .word 0
            .word 0
            .word 0

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