init.s

基于S3C4510B的应用程序开发

    
   AREA    Init, CODE, READONLY
		CODE32
		GET snds.s
		
        ENTRY

 
 ;part1
 
    MRS	r0, cpsr
	BIC	r0, r0, #MASK_MODE
	ORR	r0, r0, #MODE_SVC32
	ORR r0, r0, #I_BIT
	ORR r0, r0, #F_BIT
	MSR	cpsr_c, r0
	
    LDR   r0, =ARM7_SYSCFG                       ;
    LDR   r1, =0xE7FFFF80                      ;SYSCFG的初始值（根据实际需要设置SYSCFG的值）
    STR   r1, [r0]
	
;part2
	LDR	r1, =rEXTDBWTH 				;EXTDBWTH          		
	LDR	r2, =rROMCON0  				;ROMCON0	@ 0M ~ 2M	
	LDR	r3, =rROMCON1				;ROMCON1	@ DISABLED
	LDR	r4, =rROMCON2				;ROMCON1	@ DISABLED
	LDR	r5, =rROMCON3				;ROMCON1	@ DISABLED
	LDR	r6, =rROMCON4				;ROMCON1	@ DISABLED
	LDR	r7, =rROMCON5				;ROMCON1	@ DISABLED
	LDR	r8, =rSDRAMCON0				;SDRAMCON0 	@ 2M ~ 18M
	LDR	r9, =rSDRAMCON1				;SDRAMCON1 	@ DISABLED
	LDR	r10,=rSDRAMCON2				;SDRAMCON2 	@ DISABLED
	LDR	r11,=rSDRAMCON3				;SDRAMCON3 	@ DISABLED
	LDR	r12,=rSREFEXTCON			
	
	LDR	r0, =ARM7_EXTDBWTH 			
	STMIA	r0, {r1-r12}

    ;LDR	r0, =ARM7_SYSCFG
	;LDR	r1, =0xE7FFFF80		;0x87ffffA0		;config SYSCFG
	;STR	r1, [r0] 					;Cache & WB disabled
	
	;LDR r0, =ARM7_EXTDBWTH
	;LDR r1, =0x3002
	;STR r1, [r0]
	
	;LDR r0, =ARM7_ROMCON0
	;LDR r1, =0x2000060
	;STR r1, [r0]

	;LDR r0, =ARM7_DRAMCON0
	;LDR r1, =0x12008390
	;STR r1, [r0]
	
    ;LDR r0, =ARM7_REFEXTCON
	;LDR r1, =0x9c218360
	;STR r1, [r0]
	
;part3

	 IMPORT |Image$$RO$$Base|    
	IMPORT |Image$$RO$$Limit|   
	IMPORT |Image$$RW$$Base|   
	IMPORT |Image$$RW$$Limit| 	
	IMPORT |Image$$ZI$$Base| 	
	IMPORT |Image$$ZI$$Limit| 
	
	;***************************************************************
;Self copy from FLASH to SDRAM

	LDR		r0, =|Image$$RO$$Base|      
	LDR		r1, =|Image$$RO$$Limit|      
	LDR		r2, =|Image$$RW$$Base|      
	LDR		r3, =|Image$$RW$$Limit|     

	SUB 	r1, r1, r0
	SUB		r3, r3, r2
	ADD		r1, r1, r3
	
	LDR		r2, =0x200000   ;@2M
    ;ADD     r2,r2,r0             ;确保从重新映象后的数据是完全一致的
	
COPY
	LDR		r3, [r0], #4
	STR		r3, [r2], #4
	SUBS	r1, r1,   #4
	BNE		COPY

    LDR	r1, =rEXTDBWTH_R 			;EXTDBWTH          		
	LDR	r2, =rROMCON0_R  			;ROMCON0	@ 16M ~ 18M	
	LDR	r3, =rROMCON1_R				;ROMCON1	@ DISABLED
	LDR	r4, =rROMCON2_R				;ROMCON2	@ DISABLED
	LDR	r5, =rROMCON3_R				;ROMCON3	@ DISABLED
	LDR	r6, =rROMCON4_R				;ROMCON4	@ DISABLED
	LDR	r7, =rROMCON5_R				;ROMCON4	@ DISABLED
	LDR	r8, =rSDRAMCON0_R			;SDRAMCON0 	@ 0M ~ 16M
	LDR	r9, =rSDRAMCON1_R			;SDRAMCON1 	@ DISABLED
	LDR	r10,=rSDRAMCON2_R			;SDRAMCON2 	@ DISABLED
	LDR	r11,=rSDRAMCON3_R			;SDRAMCON3 	@ DISABLED
	LDR	r12,=rSREFEXTCON_R			

	LDR	r0, =ARM7_EXTDBWTH 			
	STMIA	r0, {r1-r12}

    
	LDR		sp, =0x400000
	
    IMPORT	main
	LDR		pc, =main

        END