📄 44binit.s
字号:
str r1,[r0]
# ****************************************
# * change BDMACON reset value for BDMA *
# ****************************************
ldr r0,=BDIDES0
ldr r1,=0x40000000 /* BDIDESn reset value should be 0x40000000 */
str r1,[r0]
ldr r0,=BDIDES1
ldr r1,=0x40000000 /* BDIDESn reset value should be 0x40000000 */
str r1,[r0]
# ****************************************************
# * Set memory control registers *
# ****************************************************
ldr r0, =SMRDATA
.ifdef EXEC_FROM_RAM
ldr r1, =Image_RO_Base
sub r0, r0, r1
.endif
ldmia r0, {r1-r13}
ldr r0, =0x01c80000 /* BWSCON Address */
stmia r0, {r1-r13}
.ifdef EXEC_FROM_RAM
mov r0, #0
ldr r1, =Image_RO_Base
ldr r3, =Image_ZI_Limit
LoopRw:
cmp r1, r3
ldrcc r2, [r0], #4
strcc r2, [r1], #4
bcc LoopRw
ldr pc, =Jump
Jump:
nop
nop
nop
.endif
# ****************************************************
# * Initialize stacks *
# ****************************************************
InitStacks:
# Don't use DRAM,such as stmfd,ldmfd......
# SVCstack is initialized before
# Under toolkit ver 2.50, 'msr cpsr,r1' can be used instead of 'msr cpsr_cxsf,r1'
mrs r0,cpsr
bic r0,r0,#MODEMASK|NOINT
orr r1,r0,#UNDEFMODE
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|IRQ_MODE
msr cpsr_cxsf,r1 /* IRQMode */
ldr sp,=IRQStack
orr r1,r0,#FIQMODE|FIQ_MODE
msr cpsr_cxsf,r1 /* FIQMode */
ldr sp,=FIQStack
bic r0,r0,#MODEMASK
orr r1,r0,#SVCMODE
msr cpsr_cxsf,r1 /* SVCMode */
ldr sp,=SVCStack
# ****************************************************
# * 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]
# ********************************************************
# * Copy and paste RW data/zero initialized data *
# ********************************************************
LDR r0, =Image_RO_Limit /* Get pointer to ROM data */
LDR r1, =Image_RW_Base /* and RAM copy */
LDR r3, =Image_ZI_Base
/* Zero init base => top of initialised data */
CMP r0, r1 /* Check that they are different */
BEQ F1
F0:
CMP r1, r3 /* Copy init data */
LDRCC r2, [r0], #4 /* --> LDRCC r2, [r0] + ADD r0, r0, #4 */
STRCC r2, [r1], #4 /* --> STRCC r2, [r1] + ADD r1, r1, #4 */
BCC F0
F1:
LDR r1, =Image_ZI_Limit /* Top of zero init segment */
MOV r2, #0
F2:
CMP r3, r1 /* Zero init */
STRCC r2, [r3], #4
BCC F2
MRS r0, CPSR
BIC r0, r0, #NOINT /* enable interrupt */
MSR CPSR_cxsf, r0
/* jump to main() */
BL Main
B .
# ****************************************************
# * The function for entering power down mode *
# ****************************************************
# void EnterPWDN(int CLKCON);
EnterPWDN:
mov r2,r0 /* r0=CLKCON */
ldr r0,=REFRESH
ldr r3,[r0]
mov r1, r3
orr r1, r1, # 0x400000 /* self-refresh enable */
str r1, [r0]
nop /* Wait until self-refresh is issued. May not be needed. */
nop /* If the other bus master holds the bus, ... */
nop /* mov r0, r0 */
nop
nop
nop
nop
# enter POWERDN mode
ldr r0,=CLKCON
str r2,[r0]
# wait until enter SL_IDLE,STOP mode and until wake-up
ldr r0,=0x10
U0: subs r0,r0,#1
bne U0
# exit from DRAM/SDRAM self refresh mode.
ldr r0,=REFRESH
str r3,[r0]
mov pc,lr
.ltorg
SMRDATA:
# *****************************************************************
# * Memory configuration has to be optimized for best performance *
# * The following parameter is not optimized. *
# *****************************************************************
# *** memory access cycle parameter strategy ***
# 1) Even FP-DRAM, EDO setting has more late fetch point by half-clock
# 2) The memory settings,here, are made the safe parameters even at 66Mhz.
# 3) FP-DRAM Parameters:tRCD=3 for tRAC, tcas=2 for pad delay, tcp=2 for bus load.
# 4) DRAM refresh rate is for 40Mhz.
# bank0 16bit BOOT ROM
# bank1 NandFlash(8bit)/IDE/USB/rtl8019as/LCD
# bank2 No use
# bank3 Keyboard
# bank4 No use
# bank5 No use
# bank6 16bit SDRAM
# bank7 No use
.ifeq BUSWIDTH-16
.long 0x11110102 /* Bank0=16bit BootRom(AT29C010A*2) :0x0 */
.else
.long 0x22222220 /* Bank0=OM[1:0], Bank1~Bank7=32bit */
.endif
.long ((B0_Tacs<<13)+(B0_Tcos<<11)+(B0_Tacc<<8)+(B0_Tcoh<<6)+(B0_Tah<<4)+(B0_Tacp<<2)+(B0_PMC)) /* GCS0 */
.long ((B1_Tacs<<13)+(B1_Tcos<<11)+(B1_Tacc<<8)+(B1_Tcoh<<6)+(B1_Tah<<4)+(B1_Tacp<<2)+(B1_PMC)) /* GCS1 */
.long ((B2_Tacs<<13)+(B2_Tcos<<11)+(B2_Tacc<<8)+(B2_Tcoh<<6)+(B2_Tah<<4)+(B2_Tacp<<2)+(B2_PMC)) /* GCS2 */
.long ((B3_Tacs<<13)+(B3_Tcos<<11)+(B3_Tacc<<8)+(B3_Tcoh<<6)+(B3_Tah<<4)+(B3_Tacp<<2)+(B3_PMC)) /* GCS3 */
.long ((B4_Tacs<<13)+(B4_Tcos<<11)+(B4_Tacc<<8)+(B4_Tcoh<<6)+(B4_Tah<<4)+(B4_Tacp<<2)+(B4_PMC)) /* GCS4 */
.long ((B5_Tacs<<13)+(B5_Tcos<<11)+(B5_Tacc<<8)+(B5_Tcoh<<6)+(B5_Tah<<4)+(B5_Tacp<<2)+(B5_PMC)) /* GCS5 */
.ifc "DRAM",BDRAMTYPE
.long ((B6_MT<<15)+(B6_Trcd<<4)+(B6_Tcas<<3)+(B6_Tcp<<2)+(B6_CAN)) /* GCS6 check the MT value in parameter.a */
.long ((B7_MT<<15)+(B7_Trcd<<4)+(B7_Tcas<<3)+(B7_Tcp<<2)+(B7_CAN)) /* GCS7 */
.else
.long ((B6_MT<<15)+(B6_Trcd<<2)+(B6_SCAN)) /* GCS6 */
.long ((B7_MT<<15)+(B7_Trcd<<2)+(B7_SCAN)) /* GCS7 */
.endif
.long ((REFEN<<23)+(TREFMD<<22)+(Trp<<20)+(Trc<<18)+(Tchr<<16)+REFCNT) /* REFRESH RFEN=1, TREFMD=0, trp=3clk, trc=5clk, tchr=3clk,count=1019 */
.long 0x10 /* SCLK power down mode, BANKSIZE 32M/32M */
.long 0x20 /* MRSR6 CL=2clk */
.long 0x20 /* MRSR7 */
.equ UserStack, _ISR_STARTADDRESS-0xf00 /* c7ff000 */
.equ SVCStack, _ISR_STARTADDRESS-0xf00+256 /* c7ff100 */
.equ UndefStack, _ISR_STARTADDRESS-0xf00+256*2 /* c7ff200 */
.equ AbortStack, _ISR_STARTADDRESS-0xf00+256*3 /* c7ff300 */
.equ IRQStack, _ISR_STARTADDRESS-0xf00+256*4 /* c7ff400 */
.equ FIQStack, _ISR_STARTADDRESS-0xf00+256*5 /* c7ff500 */
.equ HandleReset, _ISR_STARTADDRESS
.equ HandleUndef, _ISR_STARTADDRESS+4
.equ HandleSWI, _ISR_STARTADDRESS+4*2
.equ HandlePabort, _ISR_STARTADDRESS+4*3
.equ HandleDabort, _ISR_STARTADDRESS+4*4
.equ HandleReserved, _ISR_STARTADDRESS+4*5
.equ HandleIRQ, _ISR_STARTADDRESS+4*6
.equ HandleFIQ, _ISR_STARTADDRESS+4*7
# Don't use the label 'IntVectorTable',
# because armasm.exe cann't recognize this label correctly.
# the value is different with an address you think it may be.
# IntVectorTable
.equ HandleADC, _ISR_STARTADDRESS+4*8
.equ HandleRTC, _ISR_STARTADDRESS+4*9
.equ HandleUTXD1, _ISR_STARTADDRESS+4*10
.equ HandleUTXD0, _ISR_STARTADDRESS+4*11
.equ HandleSIO, _ISR_STARTADDRESS+4*12
.equ HandleIIC, _ISR_STARTADDRESS+4*13
.equ HandleURXD1, _ISR_STARTADDRESS+4*14
.equ HandleURXD0, _ISR_STARTADDRESS+4*15
.equ HandleTIMER5, _ISR_STARTADDRESS+4*16
.equ HandleTIMER4, _ISR_STARTADDRESS+4*17
.equ HandleTIMER3, _ISR_STARTADDRESS+4*18
.equ HandleTIMER2, _ISR_STARTADDRESS+4*19
.equ HandleTIMER1, _ISR_STARTADDRESS+4*20
.equ HandleTIMER0, _ISR_STARTADDRESS+4*21
.equ HandleUERR01, _ISR_STARTADDRESS+4*22
.equ HandleWDT, _ISR_STARTADDRESS+4*23
.equ HandleBDMA1, _ISR_STARTADDRESS+4*24
.equ HandleBDMA0, _ISR_STARTADDRESS+4*25
.equ HandleZDMA1, _ISR_STARTADDRESS+4*26
.equ HandleZDMA0, _ISR_STARTADDRESS+4*27
.equ HandleTICK, _ISR_STARTADDRESS+4*28
.equ HandleEINT4567, _ISR_STARTADDRESS+4*29
.equ HandleEINT3, _ISR_STARTADDRESS+4*30
.equ HandleEINT2, _ISR_STARTADDRESS+4*31
.equ HandleEINT1, _ISR_STARTADDRESS+4*32
.equ HandleEINT0, _ISR_STARTADDRESS+4*33 /* 0xc1(c7)fff84 */
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