📄 boot.s
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cmp r12,#BIT_WDT
beq L_WDT
cmp r12,#BIT_UART1
beq L_UART1
cmp r12,#BIT_EINT0
beq L_EINT0
cmp r12,#BIT_EINT1
beq L_EINT1
cmp r12,#BIT_EINT2
beq L_EINT2
cmp r12,#BIT_EINT3
beq L_EINT3
cmp r12,#BIT_EINT4_7
beq L_EINT4_7
cmp r12,#BIT_EINT8_23
beq L_EINT8_23
cmp r12,#BIT_LCD
beq L_LCD
cmp r12,#BIT_USBD
beq L_USBD
cmp r12,#BIT_USBH
beq L_USBH
cmp r12,#BIT_ADC
beq L_ADC
cmp r12,#BIT_RTC
beq L_RTC
cmp r12,#BIT_TIMER0
beq L_TIMER0
b L_Default
;;;;; Following Handle can be added if you want :)
;HandleRSV6 # 4
;HandleBATFLT # 4
;HandleTICK # 4
;HandleTIMER1 # 4
;HandleTIMER2 # 4
;HandleTIMER3 # 4
;HandleTIMER4 # 4
;HandleUART2 # 4
;HandleMMC # 4
;HandleSPI0 # 4
;HandleRSV24 # 4
;HandleIIC # 4
;HandleUART0 # 4
;HandleSPI1 # 4
L_WDT
ldmfd r13!,{r12}
HANDLER HandleWDT
L_UART1
ldmfd r13!,{r12}
HANDLER HandleUART1
L_EINT0
ldmfd r13!,{r12}
HANDLER HandleEINT0
L_EINT1
ldmfd r13!,{r12}
HANDLER HandleEINT1
L_EINT2
ldmfd r13!,{r12}
HANDLER HandleEINT2
L_EINT3
ldmfd r13!,{r12}
HANDLER HandleEINT3
L_EINT4_7
ldmfd r13!,{r12}
HANDLER HandleEINT4_7
L_EINT8_23
ldmfd r13!,{r12}
HANDLER HandleEINT8_23
L_LCD
ldmfd r13!,{r12}
HANDLER HandleLCD
L_USBD
ldmfd r13!,{r12}
HANDLER HandleUSBD
L_USBH
ldmfd r13!,{r12}
HANDLER HandleUSBH
L_ADC
ldmfd r13!,{r12}
HANDLER HandleADC
L_RTC
ldmfd r13!,{r12}
HANDLER HandleRTC
L_TIMER0
ldmfd r13!,{r12}
HANDLER HandleTIMER0
L_Default
ldmfd r13!,{r12}
HANDLER HandleIRQ
;;;;;;;;;; Reset to here
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,=0x7ff ; all sub interrupt disable
str r1,[r0]
ldr r0, = INTMOD
mov r1, #0x0 ; set all interrupt as IRQ (not FIQ)
str r1, [r0]
; :::::::::::::::::::::::::::::::::::::::::::::
; BEGIN: Power Management
; - - - - - - - - - - - - - - - - - - - - - - -
ldr r1, =GSTATUS2 ; Determine Booting Mode
ldr r10, [r1]
tst r10, #0x2
beq %F2 ; if not wakeup from PowerOffmode Skip
; MISCCR setting
ldr r1, =MISCCR ; MISCCRs Bit 17, 18, 19 -> 0
ldr r0, [r1] ; I donnot know why, Just fallow Sample Code.
bic r0, r0, #(7 << 17) ; SCLK0:0->SCLK, SCLK1:0->SCLK, SCKE:L->H
str r0, [r1]
; Set memory control registers
add r0, pc, #SMRDATA - (. + 8)
ldr r1, =BWSCON ; BWSCON Address
add r2, r0, #52 ; End address of SMRDATA
loop10
ldr r3, [r0], #4
str r3, [r1], #4
cmp r2, r0
bne loop10
mov r1, #256
loop11
subs r1, r1, #1 ; wait until the SelfRefresh is released.
bne loop11
; ldr r2, =0x41000 ; offset into the RAM
; add r2, r2, #0x32000000 ; add physical base
ldr r2, =0x201000 ; offset into the RAM
add r2, r2, #0x30000000 ; add physical base
mov pc, r2 ; & jump to StartUp address
nop
nop
nop
b .
b %F3 ; if wakeup from PowerOff mode
; goto Power-up code.
; Watchdog reset
2
tst r10, #0x4 ; In case of the wake-up from Watchdog reset,
; go to SDRAM start address(0x3000_0000)
beq %F4 ; If not wakeup from Watchdog reset,
; goto Normal Mode.
mov r0, #4
str r0, [r1] ; Clear the GSTATUS2. Because same code is located in memory address.
; Set memory control registers
ldr r0, =SMRDATA
ldr r1, =BWSCON ; BWSCON Address
add r2, r0, #52 ; End address of SMRDATA
loop0
ldr r3, [r0], #4
str r3, [r1], #4
cmp r2, r0
bne loop0
mov r1, #256
loop1
subs r1, r1, #1 ; wait until the SelfRefresh is released.
bne loop1
ldr r2, =0x201000 ; offset into the RAM
add r2, r2, #0x30000000 ; add physical base
mov pc, r2 ; & jump to StartUp address
b .
; Case of Power off reset
3
ldr r1, =MISCCR ; MISCCRs Bit 17, 18, 19 -> 0
ldr r0, [r1] ; I donnot know why, Just fallow Sample Code.
bic r0, r0, #(7 << 17) ; SCLK0:0->SCLK, SCLK1:0->SCLK, SCKE:L->H
str r0, [r1]
; - - - - - - - - - - - - - - - - - - - - - - -
; END: Power Management
; :::::::::::::::::::::::::::::::::::::::::::::
4
;;;;;;;;;; Configure GPIO pins
bl Port_Init
;;;;;;;;;; Clk div n
ldr r0,=CLKDIVN
ldr r1,=0x3 ; 1:2:4
str r1,[r0]
; delay
mov r0, #DELAY
5 subs r0, r0, #1
bne %B5
;;;;;;;;;; MMU_SetAsyncBusMode FCLK:HCLK= 1:2
ands r1, r1, #0x2
beq %F1
mrc p15,0,r0,c1,c0,0
orr r0,r0,#R1_nF:OR:R1_iA
mcr p15,0,r0,c1,c0,0
1
;To reduce PLL lock time, adjust the LOCKTIME register.
ldr r0,=LOCKTIME
ldr r1,=0xffffff
str r1,[r0]
; delay
mov r0, #DELAY
5 subs r0, r0, #1
bne %B5
;;;;;;;;;; Configure MPLL
ldr r0,=MPLLCON
ldr r1,=((0x5c<<12)+(0x4<<4)+0x0) ;Fin=12MHz,Fout=200MHz
str r1,[r0]
; delay
mov r0, #DELAY
5 subs r0, r0, #1
bne %B5
;;;;;;;;;; Configure UPLL
ldr r0, =UPLLCON
ldr r1, =((0x48<<12)+(0x3<<4)+0x2) ;Fin=12MHz, Fout=48MHz
str r1, [r0]
; delay
mov r0, #0x200
5 subs r0, r0, #1
bne %B5
;;;;;;;;;; Configure memory controller
;ldr r0,=SMRDATA
add r0, pc, #SMRDATA - (. + 8)
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
nop
;;;;;;;;;; Zero SDRAM
ldr r1,=SDRAM_CLEAR
ldr r2,=SDRAM_CLEAR
ldr r3,=SDRAM_CLEAR
ldr r4,=SDRAM_CLEAR
ldr r5,=SDRAM_CLEAR
ldr r6,=SDRAM_CLEAR
ldr r7,=SDRAM_CLEAR
ldr r8,=SDRAM_CLEAR
ldr r9,=SDRAM_SIZE
ldr r0,=SDRAM_BASE
3
stmia r0!,{r1-r8}
subs r9,r9,#32
bne %B3
;;;;;;;;;; Initialize stack
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.
;;;;;;;;;; Load codes in C
b Starting
LTORG
SMRDATA DATA
; 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 ((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)+(B3_Tacs<<13)+(B3_Tcos<<11)+(B3_Tacc<<8)+(B3_Tcoh<<6)+(B3_Tah<<4)+(B3_Tacp<<2)+(B3_PMC))
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
ALIGN
AREA ISR_TABLE,DATA,READWRITE
^ _ISR_STARTADDRESS
; DO NOT use DCD here
; cause we fill Handle in C after boot.s
HandleReset # 4
HandleUndef # 4
HandleSWI # 4
HandlePabort # 4
HandleDabort # 4
HandleReserved # 4
HandleIRQ # 4
HandleFIQ # 4
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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