?? start.s
字號(hào):
ldr r0, =0xec75
cmp r5, r0
beq %F1
mov r6, #1
1
bl ReadNandStatus
mov r8, #0
ldr r9, =ResetEntry
2
ands r0, r8, #0x1f
bne %F3
mov r0, r8
bl CheckBadBlk
cmp r0, #0
addne r8, r8, #32
bne %F4
3
mov r0, r8
mov r1, r9
bl ReadNandPage
add r9, r9, #512
add r8, r8, #1
4
cmp r8, #256
bcc %B2
mov r5, #NFCONF ;DsNandFlash
ldr r0, [r5]
and r0, r0, #~0x8000
str r0, [r5]
ldr pc, =copy_proc_beg
;===========================================================
copy_proc_beg
adr r0, ResetEntry
ldr r2, BaseOfROM
cmp r0, r1
ldreq r0, TopOfROM
beq InitRam
ldr r3, TopOfROM
0
ldmia r0!, {r4-r7}
stmia r2!, {r4-r7}
cmp r2, r3
bcc %B0
sub r2, r2, r3
sub r0, r0, r2
InitRam
ldr r2, BaseOfBSS
ldr r3, BaseOfZero
0
cmp r2, r3
ldrcc r1, [r0], #4
strcc r1, [r2], #4
bcc %B0
mov r0, #0
ldr r3, EndOfBSS
1
cmp r2, r3
strcc r0, [r2], #4
bcc %B1
;send reset status to main function
ldr r1, =GSTATUS2
ldr r0, [r1]
str r0, [r1] ;clear reset status
[ :LNOT:THUMBCODE
ldr pc, GotoMain ;bl Main ;Don't use main() because ......
b .
]
[ THUMBCODE ;for start-up code for Thumb mode
orr lr,pc,#1
bx lr
CODE16
bl Main ;Don't use main() because ......
b .
CODE32
]
;===========================================================
EXPORT disable_irq
disable_irq
mrs r0, cpsr ;enter svc mode and disable irq,fiq
orr r0, r0, #0xc0
msr cpsr_c, r0
mov pc, lr
ReadNandID
mov r7,#NFCONF
ldr r0,[r7,#0] ;NFChipEn();
bic r0,r0,#0x800
str r0,[r7,#0]
mov r0,#0x90 ;WrNFCmd(RdIDCMD);
strb r0,[r7,#4]
mov r4,#0 ;WrNFAddr(0);
strb r4,[r7,#8]
1 ;while(NFIsBusy());
ldr r0,[r7,#0x10]
tst r0,#1
beq %B1
ldrb r0,[r7,#0xc] ;id = RdNFDat()<<8;
mov r0,r0,lsl #8
ldrb r1,[r7,#0xc] ;id |= RdNFDat();
orr r5,r1,r0
ldr r0,[r7,#0] ;NFChipDs();
orr r0,r0,#0x800
str r0,[r7,#0]
mov pc,lr
ReadNandStatus
mov r7,#NFCONF
ldr r0,[r7,#0] ;NFChipEn();
bic r0,r0,#0x800
str r0,[r7,#0]
mov r0,#0x70 ;WrNFCmd(QUERYCMD);
strb r0,[r7,#4]
ldrb r1,[r7,#0xc] ;r1 = RdNFDat();
ldr r0,[r7,#0] ;NFChipDs();
orr r0,r0,#0x800
str r0,[r7,#0]
mov pc,lr
WaitNandBusy
mov r0,#0x70 ;WrNFCmd(QUERYCMD);
mov r1,#NFCONF
strb r0,[r1,#4]
1 ;while(!(RdNFDat()&0x40));
ldrb r0,[r1,#0xc]
tst r0,#0x40
beq %B1
mov r0,#0 ;WrNFCmd(READCMD0);
strb r0,[r1,#4]
mov pc,lr
CheckBadBlk
mov r7, lr
mov r5, #NFCONF
bic r0, r0, #0x1f ;addr &= ~0x1f;
ldr r1,[r5,#0] ;NFChipEn()
bic r1,r1,#0x800
str r1,[r5,#0]
mov r1,#0x50 ;WrNFCmd(READCMD2)
strb r1,[r5,#4]
mov r1, #6
strb r1,[r5,#8] ;WrNFAddr(6)
strb r0,[r5,#8] ;WrNFAddr(addr)
mov r1,r0,lsr #8 ;WrNFAddr(addr>>8)
strb r1,[r5,#8]
cmp r6,#0 ;if(NandAddr)
movne r0,r0,lsr #16 ;WrNFAddr(addr>>16)
strneb r0,[r5,#8]
bl WaitNandBusy ;WaitNFBusy()
ldrb r0, [r5,#0xc] ;RdNFDat()
sub r0, r0, #0xff
mov r1,#0 ;WrNFCmd(READCMD0)
strb r1,[r5,#4]
ldr r1,[r5,#0] ;NFChipDs()
orr r1,r1,#0x800
str r1,[r5,#0]
mov pc, r7
ReadNandPage
mov r7,lr
mov r4,r1
mov r5,#NFCONF
ldr r1,[r5,#0] ;NFChipEn()
bic r1,r1,#0x800
str r1,[r5,#0]
mov r1,#0 ;WrNFCmd(READCMD0)
strb r1,[r5,#4]
strb r1,[r5,#8] ;WrNFAddr(0)
strb r0,[r5,#8] ;WrNFAddr(addr)
mov r1,r0,lsr #8 ;WrNFAddr(addr>>8)
strb r1,[r5,#8]
cmp r6,#0 ;if(NandAddr)
movne r0,r0,lsr #16 ;WrNFAddr(addr>>16)
strneb r0,[r5,#8]
ldr r0,[r5,#0] ;InitEcc()
orr r0,r0,#0x1000
str r0,[r5,#0]
bl WaitNandBusy ;WaitNFBusy()
mov r0,#0 ;for(i=0; i<512; i++)
1
ldrb r1,[r5,#0xc] ;buf[i] = RdNFDat()
strb r1,[r4,r0]
add r0,r0,#1
bic r0,r0,#0x10000
cmp r0,#0x200
bcc %B1
ldr r0,[r5,#0] ;NFChipDs()
orr r0,r0,#0x800
str r0,[r5,#0]
mov pc,r7
;===========================================================
;function initializing stacks
InitStacks
;Don't use DRAM,such as stmfd,ldmfd......
;SVCstack is initialized before
;Under toolkit ver 2.5, 'msr cpsr,r1' can be used instead of 'msr cpsr_cxsf,r1'
mrs r0,cpsr
bic r0,r0,#MODEMASK
orr r1,r0,#UNDEFMODE|NOINT
msr cpsr_cxsf,r1 ;UndefMode
ldr sp,=UndefStack
orr r1,r0,#ABORTMODE|NOINT
msr cpsr_cxsf,r1 ;AbortMode
ldr sp,=AbortStack
orr r1,r0,#IRQMODE|NOINT
msr cpsr_cxsf,r1 ;IRQMode
ldr sp,=IRQStack
orr r1,r0,#FIQMODE|NOINT
msr cpsr_cxsf,r1 ;FIQMode
ldr sp,=FIQStack
bic r0,r0,#MODEMASK|NOINT
orr r1,r0,#SVCMODE
msr cpsr_cxsf,r1 ;SVCMode
ldr sp,=SVCStack
;USER mode has not be initialized.
mov pc,lr
;The LR register won't be valid if the current mode is not SVC mode.
LTORG
SMRDATA DATA
; Memory configuration should be optimized for best performance
; The following parameter is not optimized.
; Memory access cycle parameter strategy
; 1) The memory settings is safe parameters even at HCLK=75Mhz.
; 2) SDRAM refresh period is for HCLK=75Mhz.
DCD (0+(B1_BWSCON<<4)+(B2_BWSCON<<8)+(B3_BWSCON<<12)+(B4_BWSCON<<16)+(B5_BWSCON<<20)+(B6_BWSCON<<24)+(B7_BWSCON<<28))
DCD ((B0_Tacs<<13)+(B0_Tcos<<11)+(B0_Tacc<<8)+(B0_Tcoh<<6)+(B0_Tah<<4)+(B0_Tacp<<2)+(B0_PMC)) ;GCS0
DCD ((B1_Tacs<<13)+(B1_Tcos<<11)+(B1_Tacc<<8)+(B1_Tcoh<<6)+(B1_Tah<<4)+(B1_Tacp<<2)+(B1_PMC)) ;GCS1
DCD ((B2_Tacs<<13)+(B2_Tcos<<11)+(B2_Tacc<<8)+(B2_Tcoh<<6)+(B2_Tah<<4)+(B2_Tacp<<2)+(B2_PMC)) ;GCS2
DCD 0x1f7c;((B3_Tacs<<13)+(B3_Tcos<<11)+(B3_Tacc<<8)+(B3_Tcoh<<6)+(B3_Tah<<4)+(B3_Tacp<<2)+(B3_PMC)) ;GCS3
DCD ((B4_Tacs<<13)+(B4_Tcos<<11)+(B4_Tacc<<8)+(B4_Tcoh<<6)+(B4_Tah<<4)+(B4_Tacp<<2)+(B4_PMC)) ;GCS4
DCD ((B5_Tacs<<13)+(B5_Tcos<<11)+(B5_Tacc<<8)+(B5_Tcoh<<6)+(B5_Tah<<4)+(B5_Tacp<<2)+(B5_PMC)) ;GCS5
DCD ((B6_MT<<15)+(B6_Trcd<<2)+(B6_SCAN)) ;GCS6
DCD ((B7_MT<<15)+(B7_Trcd<<2)+(B7_SCAN)) ;GCS7
DCD ((REFEN<<23)+(TREFMD<<22)+(Trp<<20)+(Trc<<18)+(Tchr<<16)+REFCNT)
DCD 0x32 ;SCLK power saving mode, BANKSIZE 128M/128M
DCD 0x30 ;MRSR6 CL=3clk
DCD 0x30 ;MRSR7
; DCD 0x20 ;MRSR6 CL=2clk
; DCD 0x20 ;MRSR7
BaseOfROM DCD |Image$$RO$$Base|
TopOfROM DCD |Image$$RO$$Limit|
BaseOfBSS DCD |Image$$RW$$Base|
BaseOfZero DCD |Image$$ZI$$Base|
EndOfBSS DCD |Image$$ZI$$Limit|
GBLS main_entry
main_entry SETS "Main"
IMPORT $main_entry
GotoMain DCD $main_entry
ALIGN
AREA RamData, DATA, READWRITE
^ _ISR_STARTADDRESS
HandleReset # 4
HandleUndef # 4
HandleSWI # 4
HandlePabort # 4
HandleDabort # 4
HandleReserved # 4
HandleIRQ # 4
HandleFIQ # 4
;Don't use the label 'IntVectorTable',
;The value of IntVectorTable is different with the address you think it may be.
;IntVectorTable
HandleEINT0 # 4
HandleEINT1 # 4
HandleEINT2 # 4
HandleEINT3 # 4
HandleEINT4_7 # 4
HandleEINT8_23 # 4
HandleRSV6 # 4
HandleBATFLT # 4
HandleTICK # 4
HandleWDT # 4
HandleTIMER0 # 4
HandleTIMER1 # 4
HandleTIMER2 # 4
HandleTIMER3 # 4
HandleTIMER4 # 4
HandleUART2 # 4
HandleLCD # 4
HandleDMA0 # 4
HandleDMA1 # 4
HandleDMA2 # 4
HandleDMA3 # 4
HandleMMC # 4
HandleSPI0 # 4
HandleUART1 # 4
HandleRSV24 # 4
HandleUSBD # 4
HandleUSBH # 4
HandleIIC # 4
HandleUART0 # 4
HandleSPI1 # 4
HandleRTC # 4
HandleADC # 4
END
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