init_ice.s

USB的驱动编程实例

;init the mem map no the integrate board


	include hardware_gfd.h


	AREA INIT, CODE, READONLY                                                     
	       ENTRY                           ; Mark first instruction to execute 
		
	LDR		RTA, =0x10000000
	LDR		RTB, =0x0	
	STR		RTB, [RTA]
	
	LDR		RTA, =0x10000008
	LDR		RTB, =0xffffffff	
	STR		RTB, [RTA]
	
	LDR		RTA, =0x1100100c
	LDR		RTB, =0x0	
	STR		RTB, [RTA]
	
	LDR		RTA, =0X10008000
	LDR		RTB, =0x1	
	STR		RTB, [RTA]
	
	LDR		RTA, =0X10008000
	LDR		RTB, =0x0	
	STR		RTB, [RTA]
	;/////////////////////////////
	;init sp_svc
	ldr		sp, =SP_SVC 
	
	
	;chmod to irq and init sp_irq                                       
	mov		RTA, #0xD2                                                  
	msr		cpsr_cf, RTA                                                
	ldr		sp, =SP_IRQ                                                 
                                                                    
                                                                    
	;chomod to fiq and init sp_fiq                                      
	mov		RTA, #0XD1                                                  
	msr		cpsr_cf, RTA                                                
	ldr		sp, =SP_FIQ                                                 
                                                                    
	;chomod to abt and init sp_ABT                                      
	mov		RTA, #0XD7                                                  
	msr		cpsr_cf, RTA                                                
	ldr		sp, =SP_ABT                                                 
                                                                    
	;chomod to undf and init sp_UNDF                                    
	mov		RTA, #0XDB                                                  
	msr		cpsr_cf, RTA                                                
	ldr		sp, =SP_UND 	                                            
                                                                    
	;CHMOD TO SYS AND INTI SP_SYS                                       
	mov 	RTA, #0xDF		;@all interrupts disabled,                  
	msr		cpsr_cxsf, RTA   ; @SYSTEM mode, @32-bit code mode          
	ldr		sp, =SP_SYS   ;INIT SYS_SP                                  
                                                                    
	;chmod to svc modle                                                 
	mov		RTA, #0XD3                                                  
	msr		cpsr_c, RTA   
	
;****************************************************************
; 	init the EMI and get the memory space
;****************************************************************
  
	ldr		RTA, =0x11000004    ;THE ADD OF EMI_CSGBAB   
  	ldr		RTB, =0x24002000	                       
  	str		RTB, [ RTA ]     
 
	 
	ldr		RTA, =0x11000008    ;THE ADD OF EMI_CSGBCD   
	ldr		RTB, =0x2c002800	                       
	str		RTB, [ RTA ]     
	 
	ldr		RTA, =0x1100000c    ;THE ADD OF EMI_CSGBEF   
	ldr		RTB, =0x34003000	                       
	str		RTB, [ RTA ]     
	    
	                              
	ldr		RTA, =0x11000000        ;THE ADD OF EMIADDR_SMCONF
	ldr		RTB, =0x9b0133ff	
	str		RTB, [ RTA ]
	  
	ldr		RTA, =0x11000014        ;THE ADD OF EMIADDR_SMCONF1
	ldr		RTB, =0x0110a077	
	str		RTB, [ RTA ]
	  
	ldr		RTA, =0x11000018        ;THE ADD OF EMIADDR_SMCONF2
	ldr		RTB, =0x80000500	
	str		RTB, [ RTA ]
	  
	ldr		RTA, =0x11000010        ;REMAP 0 ADDRESS TO SDRAM 
	ldr		RTB, =0x0b	
	str		RTB, [ RTA ]
	    
	
;***************************************************************
;    	enable CPSR IRQ bit
;***************************************************************
  	mrs		RTA, cpsr
	bic		RTA, RTA, #0x80  		;set bit7 to zero
	msr		cpsr_c, RTA     

	
	
	IMPORT	__main
	
	B	__main
	
	END