bootloader中的唤醒部分
WAKEUP_SLEEP
;Release SCLKn after wake-up from the SLEEP mode.
ldr r1,=MISCCR
ldr r0,[r1]
bic r0,r0,#(7SCLK, SCKE:0->=SCKE.
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
0
ldr r3, [r0], #4
str r3, [r1], #4
cmp r2, r0
bne %B0
mov r0, #0x2000
;0 subs r1,r1,#1 ;1) wait until the SelfRefresh is released.
0 subs r0, r0, #1
bne %B0
;ldr r1,=GSTATUS3 ;GSTATUS3 has the start address just after SLEEP wake-up
;ldr r0,[r1]
;mov pc,r0
;------------------------------------------------------------------------------
; Recover Process : Starting Point
;
; 1. Checksum Calculation saved Data
ldr r5, =SLEEPDATA_BASE_PHYSICAL ; pointer to physical address of reserved Sleep mode info data structure
mov r3, r5 ; pointer for checksum calculation
ldr r2, =0x0
ldr r0, =(SLEEPDATA_SIZE-1) ; get size of data structure to do checksum on
50
ldr r1, [r3], #4 ; pointer to SLEEPDATA
and r1, r1, #0x1
mov r1, r1, ROR #31
add r2, r2, r1
subs r0, r0, #1 ; dec the count
bne %b50 ; loop till done
ldr r0,=GSTATUS3
ldr r3, [r0] ; get the Sleep data checksum from the Power Manager Scratch pad register
cmp r2, r3 ; compare to what we saved before going to sleep
bne BringUpWinCE ; bad news - do a cold boot
; 2. MMU Enable
ldr r10, [r5, #SleepState_MMUDOMAIN] ; load the MMU domain access info
ldr r9, [r5, #SleepState_MMUTTB] ; load the MMU TTB info
ldr r8, [r5, #SleepState_MMUCTL] ; load the MMU control info
ldr r7, [r5, #SleepState_WakeAddr ] ; load the LR address
nop
nop
nop
nop
nop
; if software reset
mov r1, #0
teq r1, r7
bne %f60
b BringUpWinCE
; wakeup routine
60 mcr p15, 0, r10, c3, c0, 0 ; setup access to domain 0
mcr p15, 0, r9, c2, c0, 0 ; PT address
mcr p15, 0, r0, c8, c7, 0 ; flush I+D TLBs
mcr p15, 0, r8, c1, c0, 0 ; restore MMU control
; 3. Jump to Kernel Image's fw.s (Awake_address)
mov pc, r7 ; jump to new VA (back up Power management stack)
nop
BringUpWinCE
; bad news, data lose, bring up wince again
mov r0, #2
ldr r1, =GSTATUS2
str r0, [r1]
复制代码
休眠唤醒代码都是参考网上帖子修改的，自己没完全消化，看来还得一步步看看代码哪出问题。 买的开发板没引出PWR_EN管脚是个问题。
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