linux reboot flow

kernel_restart

==>>kmsg_dump

==>>machine_restart

==>arm_pm_restart(reboot_mode, cmd);

==> sun8i_restart(char mode, const char *cmd)

log:

root@camdroid:/ # reboot

[ 256.064771] SysRq : Emergency Remount R/O

[ 256.069375] The process is "reboot" (pid 119)

[ 256.074455] Emergency Remount complete

[ 257.083158] [VFE]vfe_opened_num = 1

[ 257.087131] [VFE]mclk off

[ 257.160681] [VFE]Vfe Shutdown!

[ 257.164160] [audiocodec] headphone_mute_used type err!

[ 257.780059] [mmc]: shutdown_mmc: is not card 2, return

[ 257.785907] [mmc]: shutdown_mmc: mmc 1 shutdown exit..ok

[ 257.791895] [mmc]: shutdown_mmc: is not card 2, return

[ 257.797715] [mmc]: shutdown_mmc: mmc 0 shutdown exit..ok

[ 257.803684] wdt_enable, write reg 0xf1c20cb8 val 0x000000b0

[ 257.900022] LCD_panel_exit: enter sleep

[ 258.210269] [DISP] disp_sys_gpio_set_value,line:374:OSAL_GPIO_DevWRITE_ONEPIN_DATA, hdl is NULL

[ 258.240052] [alarmtimer] have no shutdown alarm! alarmtimer_shutdown 315

[ 258.247574] hci: ERR: sunxi_ohci is disable, need not shutdown

[ 258.254180] hci: ERR: sunxi_ehci is disable, need not shutdown

[ 258.261285] pmu_shutdown_chgcur = 1000000

[ 258.266236] Restarting system.

[ 258.269684] [richard] step 1

[ 258.272957] [richard] step 2

[ 258.276267]

[ 258.277979] Restarting Linux version 3.4.39