ZHCU875Z August 2001 – October 2023 SM320F28335-EP
; ======== boot_c671x.s62 ========
; global EMIF symbols defined for the c671x family
.include boot_c671x.h62
.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
;************************************************************************
;****************************************************************
; *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 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