为 uboot 添加 wince 唤醒功能

前一段时间，做了uboot启动wince，但是一直没有实现wince在uboot下的唤醒功能，在这里就不再讲述wince 休眠唤醒的原理了（网上有很多资料），给出解决方法：

 

修改uboot源码目录下的

cpu\arm920t\start.S 文件

 

 

/*      * we do sys-critical inits only at reboot,      * not when booting from       */ #ifndef CONFIG_SKIP_LOWLEVEL_INIT     bl    cpu_init_crit #endif /* 从这个地方开始添加代码 */ /* Apollo +*/ /* Power Manage Check if this is a wake-up from sleep */   ldr r1, =0x560000B4                /* GSTATUS2 */   ldr r0, [r1]   tst r0, #0x02   beq BringUpWinCE WakeupStart:     ldr     r1, =0x56000080 /* ; MISCCR's Bit 17, 18, 19 -> 0 */     ldr    r0, [r1] /*; I don't know why, Just fallow Sample Code. */     bic    r0, r0, #(7 << 17) /*; SCLK0:0->SCLK, SCLK1:0->SCLK, SCKE:L->H */     str    r0, [r1] /* 1. Checksum Calculation saved Data */     ldr r5, =0x30028000 /* pointer to physical address of reserved Sleep mode info data structure */     mov r3, r5 /* pointer for checksum calculation*/     ldr r2, =0x0     ldr r0, =(25-1) /* get size of data structure to do checksum on*/ again:     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 again /*; loop till done */     ldr r0,=0x560000B8                                    /* 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, #12] /*; load the MMU domain access info*/     ldr r9, [r5, #8] /*; load the MMU TTB info */     ldr r8, [r5, #4] /*; load the MMU control info */     ldr r7, [r5, #0 ] /*; load the LR address*/     nop      nop     nop     nop     nop /* if software reset*/     mov r1, #0     teq r1, r7     bne wakeup     b     BringUpWinCE /*; wakeup routine*/ wakeup:     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: /* Apollo -*/ /*添加代码结束*/ /***************** CHECK_CODE_POSITION ******************************************/     adr    r0, _start        /* r0 <- current position of code */     ldr    r1, _TEXT_BASE        /* test if we run from flash or RAM */     cmp r0, r1 /* don't reloc during debug */     beq stack_setup /***************** CHECK_CODE_POSITION ******************************************/

http://blog.chinaunix.net/uid-8087110-id-1989043.html