CPU：S3C2410
NandFlash: k9f1208
NorFlash:29lv800
SDRAM:两片32M并联成64M
问题描述：
最近采用S3C2410_BOIS引导程序。它能够将程序烧写到NANDFLASH的几个分区：
{0, 0x00040000, "bootloader"}, //256K
{0x00040000, 0x02000000, "Wince"}, //32M
{0x02040000, 0x01fc0000, "Flash"}, //32M-256k
{0, 0 , 0}
将其修改为能够驱动TFT LCD的测试程序，并且能够从NANDFLASH启动，并最终能够烧写到第2个分区，采用原来的loader程序引导。其中发现了一个问题，S3C2410_BOIS原来在ADS中RO base默认设置是:0x30100000,我就按照其默认设置编译生成BIN文件(内嵌入图片数据，大小为5M左右)，，采用DNW (download address 为0x30100000)load到内存运行很正常。
将RO base设置是:0x30200000后重新编译成BIN再LOAD到内存（(download address 为0x30200000)）运行却发现运行速度明显变慢了(从LCD显示图片的速度看出)。
请问各位高手为什么会出现这种情况，该如何解决？
以下是这个S3C2410_BIOS中的 start.s文件,本人没有做任何修改。
;=========================================
; NAME: START.S
; DESC: C start up codes
; Configure memory, ISR ,stacks
; Initialize C-variables
; HISTORY:
; 2002.02.25:kwtark: ver 0.0
; 2002.03.20:purnnamu: Add some functions for testing STOP,POWER_OFF mode
;=========================================
GET option.inc
GET memcfg.inc
GET 2410addr.inc
BIT_SELFREFRESH EQU (1<<22)
;Pre-defined constants
USERMODE EQU 0x10
FIQMODE EQU 0x11
IRQMODE EQU 0x12
SVCMODE EQU 0x13
ABORTMODE EQU 0x17
UNDEFMODE EQU 0x1b
MODEMASK EQU 0x1f
NOINT EQU 0xc0
;The location of stacks
UserStack EQU (_STACK_BASEADDRESS-0x3800) ;0x33ff4800 ~
SVCStack EQU (_STACK_BASEADDRESS-0x2800) ;0x33ff5800 ~
UndefStack EQU (_STACK_BASEADDRESS-0x2400) ;0x33ff5c00 ~
AbortStack EQU (_STACK_BASEADDRESS-0x2000) ;0x33ff6000 ~
IRQStack EQU (_STACK_BASEADDRESS-0x1000) ;0x33ff7000 ~
FIQStack EQU (_STACK_BASEADDRESS-0x0) ;0x33ff8000 ~
;Check if tasm.exe(armasm -16 ...@ADS 1.0) is used.
GBLL THUMBCODE
[ {CONFIG} = 16
THUMBCODE SETL {TRUE}
CODE32
|
THUMBCODE SETL {FALSE}
]
MACRO
MOV_PC_LR
[ THUMBCODE
bx lr
|
mov pc,lr
]
MEND
MACRO
MOVEQ_PC_LR
[ THUMBCODE
bxeq lr
|
moveq pc,lr
]
MEND
MACRO
$HandlerLabel HANDLER $HandleLabel
$HandlerLabel
sub sp,sp,#4 ;decrement sp(to store jump address)
stmfd sp!,{r0} ;PUSH the work register to stack(lr does't push because it return to original address)
ldr r0,=$HandleLabel;load the address of HandleXXX to r0
ldr r0,[r0] ;load the contents(service routine start address) of HandleXXX
str r0,[sp,#4] ;store the contents(ISR) of HandleXXX to stack
ldmfd sp!,{r0,pc} ;POP the work register and pc(jump to ISR)
MEND
IMPORT |Image$$RO$$Base| ; Base of ROM code
IMPORT |Image$$RO$$Limit| ; End of ROM code (=start of ROM data)
IMPORT |Image$$RW$$Base| ; Base of RAM to initialise
IMPORT |Image$$ZI$$Base| ; Base and limit of area
IMPORT |Image$$ZI$$Limit| ; to zero initialise
AREA SelfBoot, CODE, READONLY
ENTRY
EXPORT __ENTRY
__ENTRY
ResetEntry
;1)The code, which converts to Big-endian, should be in little endian code.
;2)The following little endian code will be compiled in Big-Endian mode.
; The code byte order should be changed as the memory bus width.
;3)The pseudo instruction,DCD can't be used here because the linker generates error.
ASSERT :DEF:ENDIAN_CHANGE
[ ENDIAN_CHANGE
ASSERT :DEF:ENTRY_BUS_WIDTH
][ ENTRY_BUS_WIDTH=32
b ChangeBigEndian ;DCD 0xea000007
]
[ ENTRY_BUS_WIDTH=16
andeq r14,r7,r0,lsl #20 ;DCD 0x0007ea00
]
[ ENTRY_BUS_WIDTH=8
streq r0,][r0,-r10,ror #1] ;DCD 0x070000ea
]
|
b ResetHandler
]
b HandlerUndef ;handler for Undefined mode
b HandlerSWI ;handler for SWI interrupt
b HandlerPabort ;handler for PAbort
b HandlerDabort ;handler for DAbort
b . ;reserved
b HandlerIRQ ;handler for IRQ interrupt
b HandlerFIQ ;handler for FIQ interrupt
;@0x20
b EnterPWDN
ChangeBigEndian
;@0x24
[ ENTRY_BUS_WIDTH=32
DCD 0xee110f10 ;0xee110f10 => mrc p15,0,r0,c1,c0,0
DCD 0xe3800080 ;0xe3800080 => orr r0,r0,#0x80; //Big-endian
DCD 0xee010f10 ;0xee010f10 => mcr p15,0,r0,c1,c0,0
]
[ ENTRY_BUS_WIDTH=16
DCD 0x0f10ee11
DCD 0x0080e380
DCD 0x0f10ee01
]
[ ENTRY_BUS_WIDTH=8
DCD 0x100f11ee
DCD 0x800080e3
DCD 0x100f01ee
]
DCD 0xffffffff ;swinv 0xffffff is similar with NOP and run well in both endian mode.
DCD 0xffffffff
DCD 0xffffffff
DCD 0xffffffff
DCD 0xffffffff
b ResetHandler
;Function for entering power down mode
; 1. SDRAM should be in self-refresh mode.
; 2. All interrupt should be maksked for SDRAM/DRAM self-refresh.
; 3. LCD controller should be disabled for SDRAM/DRAM self-refresh.
; 4. The I-cache may have to be turned on.
; 5. The location of the following code may have not to be changed.
;void EnterPWDN(int CLKCON);
EnterPWDN
mov r2,r0 ;r2=rCLKCON
tst r0,#0x8 ;POWER_OFF mode?
bne ENTER_POWER_OFF
ENTER_STOP
ldr r0,=REFRESH
ldr r3,[r0] ;r3=rREFRESH
mov r1, r3
orr r1, r1, #BIT_SELFREFRESH
str r1, [r0] ;Enable SDRAM self-refresh
mov r1,#16 ;wait until self-refresh is issued. may not be needed.
0 subs r1,r1,#1
bne %B0
ldr r0,=CLKCON ;enter STOP mode.
str r2,[r0]
mov r1,#32
0 subs r1,r1,#1 ;1) wait until the STOP mode is in effect.
bne %B0 ;2) Or wait here until the CPU&Peripherals will be turned-off
; Entering POWER_OFF mode, only the reset by wake-up is available.
ldr r0,=REFRESH ;exit from SDRAM self refresh mode.
str r3,[r0]
MOV_PC_LR
ENTER_POWER_OFF
;NOTE.
;1) rGSTATUS3 should have the return address after wake-up from POWER_OFF mode.
ldr r0,=REFRESH
ldr r1,[r0] ;r1=rREFRESH
orr r1, r1, #BIT_SELFREFRESH
str r1, [r0] ;Enable SDRAM self-refresh
mov r1,#16 ;Wait until self-refresh is issued,which may not be needed.
0 subs r1,r1,#1
bne %B0
ldr r1,=MISCCR
ldr r0,[r1]
orr r0,r0,#(7<<17) ;Make sure that SCLK0:SCLK->0, SCLK1:SCLK->0, SCKE=L during boot-up
str r0,[r1]
ldr r0,=CLKCON
str r2,[r0]
b . ;CPU will die here.
WAKEUP_POWER_OFF
;Release SCLKn after wake-up from the POWER_OFF mode.
ldr r1,=MISCCR
ldr r0,[r1]
bic r0,r0,#(7<<17) ;SCLK0:0->SCLK, SCLK1:0->SCLK, SCKE:L->H
str r0,[r1]
;Set memory control registers
ldr r0,=SMRDATA
ldr r1,=BWSCON ;BWSCON Address
add r2, r0, #52 ;End address of SMRDATA
0
ldr r3, [r0], #4
str r3, [r1], #4
cmp r2, r0
bne %B0
mov r1,#256
0 subs r1,r1,#1 ;1) wait until the SelfRefresh is released.
bne %B0
ldr r1,=GSTATUS3 ;GSTATUS3 has the start address just after POWER_OFF wake-up
ldr r0,[r1]
mov pc,r0
LTORG
HandlerFIQ HANDLER HandleFIQ
HandlerIRQ HANDLER HandleIRQ
HandlerUndef HANDLER HandleUndef
;HandlerUndef
; sub sp, sp, #4 ;decrement sp(to store jump address)
; stmfd sp!, {r14} ;PUSH the work register to stack(lr does't push because it return to original address)
; ldr r0, =HandleUndef ;load the address of HandleXXX to r0
; ldr r0, [r0] ;load the contents(service routine start address) of HandleXXX
; str r0, [sp, #4] ;store the contents(ISR) of HandleXXX to stack
; ldmfd sp!, {r0, pc}
HandlerSWI HANDLER HandleSWI
HandlerDabort HANDLER HandleDabort
HandlerPabort HANDLER HandlePabort
IsrIRQ
sub sp, sp, #4 ;reserved for PC
stmfd sp!, {r8-r9}
ldr r9, =INTOFFSET
ldr r9, [r9]
ldr r8, =HandleEINT0
add r8, r8,r9,lsl #2
ldr r8, [r8]
str r8, [sp,#8]
ldmfd sp!,{r8-r9,pc}
;=======
; ENTRY
;=======
ResetHandler
ldr r0,=WTCON ;watch dog disable
ldr r1,=0x0
str r1,[r0]
ldr r0,=INTMSK
ldr r1,=0xffffffff ;all interrupt disable
str r1,[r0]
ldr r0,=INTSUBMSK
ldr r1,=0x3ff ;all sub interrupt disable
str r1,[r0]
[ {FALSE}
; rGPFDAT = (rGPFDAT & ~(0xf<<4)) | ((~data & 0xf)<<4);
; Led_Display
ldr r0,=GPFCON
ldr r1,=0x5500
str r1,][r0]
ldr r0,=GPFDAT
ldr r1,=0x10
str r1,[r0]
]
;To reduce PLL lock time, adjust the LOCKTIME register.
ldr r0,=LOCKTIME
ldr r1,=0xffffff
str r1,[r0]
[ PLL_ON_START
;Configure MPLL
ldr r0,=MPLLCON
ldr r1,=((M_MDIV<<12)+(M_PDIV<<4)+M_SDIV) ;Fin=12MHz,Fout=50MHz
str r1,][r0]
]
;Check if the boot is caused by the wake-up from POWER_OFF mode.
; ldr r1,=GSTATUS2
; ldr r0,[r1]
; tst r0,#0x2
;In case of the wake-up from POWER_OFF mode, go to POWER_OFF_WAKEUP handler.
; bne WAKEUP_POWER_OFF
EXPORT StartPointAfterPowerOffWakeUp
StartPointAfterPowerOffWakeUp
;Set memory control registers
adr r0, SMRDATA ;can't use ldr r0, =xxxx important!!!
ldr r1, =BWSCON ;BWSCON Address
add r2, r0, #52 ;End address of SMRDATA
0
ldr r3, [r0], #4
str r3, [r1], #4
cmp r2, r0
bne %B0
;Initialize stacks
bl InitStacks
; Setup IRQ handler
ldr r0,=HandleIRQ ;This routine is needed
ldr r1,=IsrIRQ ;if there isn't 'subs pc,lr,#4' at 0x18, 0x1c
str r1,[r0]
ldr r0, =BWSCON
ldr r0, [r0]
ands r0, r0, #6 ;OM[1:0] != 0, NOR FLash boot
bne copy_proc_beg ;don't read nand flash
adr r0, ResetEntry ;OM[1:0] == 0, NAND FLash boot
cmp r0, #0 ;if use Multi-ice,
bne copy_proc_beg ;don't read nand flash for boot
;===========================================================
nand_boot_beg
mov r5, #NFCONF
ldr r0, =(1<<15)|(1<<12)|(1<<11)|(7<<8)|(7<<4)|(7)
str r0, [r5]
bl ReadNandID
mov r6, #0
ldr r0, =0xec73
cmp r5, r0
beq %F1
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, #5
strb r1,[r5,#8] ;WrNFAddr(5)
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 = 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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