uboot启动后进入待机模式--流程

uboot进入suspend模式:

static int do_suspend (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
{
#ifndef CONFIG_M6TV
run_command("video dev bl_off",1);
run_command("video dev disable",1);
#endif
meson_pm_suspend();
return 0;
}


U_BOOT_CMD(
suspend, 1, 0, do_suspend,
"suspend",
"/N\n"
"This command will into suspend\n"
);
##################################################################
void meson_pm_suspend(void)
{


writel(0x87654321, P_AO_RTI_STATUS_REG2);//set flag for u-boot suspend cmd
    meson_power_suspend();------------------->下面
    printf("Elvis ~.~!\n");
elvis_array[3] = get_adc_sample(4);


}


meson_power_suspend()
{
....
addr = 0x9FF04400;
pwrtest_entry = (void (*)(unsigned,unsigned,unsigned,unsigned))addr;//这个地址是把start_arc.S 链接在这里么?
if(test_flag != 1234){
test_flag = 1234;
printf("initial appf\n");
pwrtest_entry(APPF_INITIALIZE,0,0,0);
}
printf("power down cpu --\n");
pwrtest_entry(APPF_POWER_DOWN_CPU,0,0,APPF_SAVE_PMU|APPF_SAVE_VFP|APPF_SAVE_L2);
} ----->调用start_arc.s


   .global _start
;; -- start of program section --------------------------
    .text
;; -- auto-vector space, jump to start of code ---------- 
_start:
    j boot_start
    ; reserved for arm reboot code. (0x220 bytes)
.....
boot_start:
; Disable Instruction  Cache 
; Disable Data Cache 
; Release power on pins except test_n, which always need pull_up


; Initialize stack pointer registers
  mov  sp, 0x8000;_STACK_END         
  ;mov sp , 0xE000


; Initialise small data pointer registers
;    mov  gp, 0xc1001e00         


; Direct to main entry
;disable caches
; lr r0,[0x47]
; or r0,r0,1
; sr r0,[0x47]
; lr r0,[0x11]
; or r0,r0,1
; sr r0,[0x11]


;clear bss segment
mov r0,0
mov r1, __bss_start
clear_loop:
st  r0,[r1]
add r1,r1,4
cmp r1,_end
bne clear_loop

    bl      main===================>跳到power_arc.c 中的main
    nop


; Jump to memory location where boot_loader is moved in
    b .
nop

./bin2code arc_code $(obj)code_elf.bin $(SRCTREE)/build/include2/arc_code.dat