strcc r1, [r2], #4

bcc %B0

mov r0, #0

ldr r3, EndOfBSS

1

cmp r2, r3

strcc r0, [r2], #4

bcc %B1

ldr pc, =%F2 ;gotocompiler address

2

; [CLKDIV_VAL>1 ; meansFclk:Hclk is not 1:1.

; bl MMU_SetAsyncBusMode

; |

; blMMU_SetFastBusMode ; default value.

; ]

;===========================================================

; Setup IRQ handler

; 把中断服务函数的总入口地址，赋给HandleIRQ地址（文件最低端定义）

ldr r0,=HandleIRQ ;Thisroutine is needed

ldr r1,=IsrIRQ ;ifthere is not 'subs pc,lr,#4' at 0x18, 0x1c

str r1,[r0]

[:LNOT:THUMBCODE

bl Main ;Do not use main() because ......

b .

]

[THUMBCODE ;for start-up code for Thumbmode

orr lr,pc,#1

bx lr

CODE16

bl Main ;Do not use main() because ......

b .

CODE32

]

;function initializing stacks

InitStacks ; 初始化栈空间（各个模式下的），为c函数运行做准备

;Donot use DRAM,such as stmfd,ldmfd......

;SVCstackis initialized before

;Undertoolkit 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 ; UndefStack=0x33FF_5C00

orr r1,r0,#ABORTMODE|NOINT

msr cpsr_cxsf,r1 ;AbortMode

ldr sp,=AbortStack ; AbortStack=0x33FF_6000

orr r1,r0,#IRQMODE|NOINT

msr cpsr_cxsf,r1 ;IRQMode

ldr sp,=IRQStack ;IRQStack=0x33FF_7000

orr r1,r0,#FIQMODE|NOINT

msr cpsr_cxsf,r1 ;FIQMode

ldr sp,=FIQStack ;FIQStack=0x33FF_8000

bic r0,r0,#MODEMASK|NOINT

orr r1,r0,#SVCMODE

msr cpsr_cxsf,r1 ;SVCMode

ldr sp,=SVCStack ;SVCStack=0x33FF_5800

;USERmode has not be initialized.

mov pc,lr

;TheLR register will not be valid if the current mode is not SVC mode.

LTORG

SMRDATA DATA

;配置存储器的管理方式

; Memory configuration should be optimizedfor 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 forHCLK<=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((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)+(Tsrc<<18)+(Tchr<<16)+REFCNT)

DCD0x32 ;SCLK power saving mode, BANKSIZE 128M/128M

DCD0x30 ;MRSR6 CL=3clk

DCD0x30 ;MRSR7 CL=3clk

;分配一个字的空间，并用后边的数值来初始化该空间 ，这里命名有些混乱

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|

ALIGN

;Function for entering power down mode

; 1. SDRAM should be in self-refresh mode.

; 2. All interrupt should be maksked forSDRAM/DRAM self-refresh.

; 3. LCD controller should be disabled forSDRAM/DRAM self-refresh.

; 4. The I-cache may have to be turned on.