📄 boot.s
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pISR_USBH EQU (_ISR_STARTADDRESS+0x88)
pISR_IIC EQU (_ISR_STARTADDRESS+0x8c)
pISR_UART0 EQU (_ISR_STARTADDRESS+0x90)
pISR_SPI1 EQU (_ISR_STARTADDRESS+0x94)
pISR_RTC EQU (_ISR_STARTADDRESS+0x98)
pISR_ADC EQU (_ISR_STARTADDRESS+0xa0)
;=================
; PENDING BIT
;=================
BIT_EINT0 EQU (0x1)
BIT_EINT1 EQU (0x1<<1)
BIT_EINT2 EQU (0x1<<2)
BIT_EINT3 EQU (0x1<<3)
BIT_EINT4_7 EQU (0x1<<4)
BIT_EINT8_23 EQU (0x1<<5)
BIT_NOTUSED6 EQU (0x1<<6)
BIT_BAT_FLT EQU (0x1<<7)
BIT_TICK EQU (0x1<<8)
BIT_WDT EQU (0x1<<9)
BIT_TIMER0 EQU (0x1<<10)
BIT_TIMER1 EQU (0x1<<11)
BIT_TIMER2 EQU (0x1<<12)
BIT_TIMER3 EQU (0x1<<13)
BIT_TIMER4 EQU (0x1<<14)
BIT_UART2 EQU (0x1<<15)
BIT_LCD EQU (0x1<<16)
BIT_DMA0 EQU (0x1<<17)
BIT_DMA1 EQU (0x1<<18)
BIT_DMA2 EQU (0x1<<19)
BIT_DMA3 EQU (0x1<<20)
BIT_SDI EQU (0x1<<21)
BIT_SPI0 EQU (0x1<<22)
BIT_UART1 EQU (0x1<<23)
BIT_NOTUSED24 EQU (0x1<<24)
BIT_USBD EQU (0x1<<25)
BIT_USBH EQU (0x1<<26)
BIT_IIC EQU (0x1<<27)
BIT_UART0 EQU (0x1<<28)
BIT_SPI1 EQU (0x1<<29)
BIT_RTC EQU (0x1<<30)
BIT_ADC EQU (0x1<<31)
BIT_ALLMSK EQU (0xffffffff)
;=================
; CPSR CPU_MODE BIT
;=================
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) ;0x31ff4800 ~
SVCStack EQU (_STACK_BASEADDRESS-0x2800) ;0x31ff5800 ~ // 256 byte stack
UndefStack EQU (_STACK_BASEADDRESS-0x2400) ;0x31ff5c00 ~
AbortStack EQU (_STACK_BASEADDRESS-0x2000) ;0x31ff6000 ~
IRQStack EQU (_STACK_BASEADDRESS-0x1000) ;0x31ff7000 ~
FIQStack EQU (_STACK_BASEADDRESS-0x0) ;0x31ff8000 ~
;;;;;;;;;; Initialization args
SDRAM_CLEAR EQU 0x0
DELAY EQU 0x200
R1_iA EQU (1<<31)
R1_nF EQU (1<<30)
;;;;;;;;;; Handlers call
MACRO
$HandlerLabel HANDLER $HandleLabel
$HandlerLabel
sub r13,r13,#4 ;decrement sp(to store jump address)
stmfd r13!,{r0} ;PUSH the work register to stack(lr doesnot push because it return to original address)
ldr r0,=$HandleLabel ;load the address of HandleXXX to r0
ldr r0,[r0] ;load the contents(service routine start address) of HandleXXX
str r0,[r13,#4] ;store the contents(ISR) of HandleXXX to stack
ldmfd r13!,{r0,pc} ;POP the work register and pc(jump to ISR)
MEND
;;;;;;;;;; C implements
IMPORT Starting
IMPORT Port_Init
;;;;;;;;;; Boot entry
AREA Init,CODE,READONLY
ENTRY
;1) all little endian code here.
;2) DCD cannot be used here cause ADSlinker generates error.
;3) 0x0 and _ISR_STARTADDRESS both have a ISR table.
b ResetHandler ; 0x00 Reset
b . ; 0x04 Undefined
b . ; 0x08 Supervisor
b . ; 0x0c Prefetch Abort
b . ; 0x10 Data Abort
b . ; 0x14 Reserved
b ISRJump ; 0x18 IRQ
b . ; 0x1c FIQ
;;;;;;;;;; ISR Jump table
ISRJump
stmfd r13!,{r12}
ldr r12,=INTPND
ldr r12,[r12]
cmp r12,#BIT_WDT
beq L_WDT
cmp r12,#BIT_UART1
beq L_UART1
cmp r12,#BIT_EINT0
beq L_EINT0
L_WDT
ldmfd r13!,{r12}
HANDLER HandleWDT
L_UART1
ldmfd r13!,{r12}
HANDLER HandleUART1
L_EINT0
ldmfd r13!,{r12}
HANDLER HandleEINT0
LTORG
;;;;;;;;;; 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]
;;;;;;;;;; Configure GPIO pins
bl Port_Init
;;;;;;;;;; Clkdivn
ldr r0,=CLKDIVN
ldr r1,=0x3 ; 1:2:4
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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