查看F1C的源代码

== Reboot failed ==

<source lang=bash>
# reboot
# Stopping network: OK
Saving random seed... done.
Stopping logging: OK
The system is going down NOW!
Sent SIGTERM to all processes
Sent SIGKILL to   20.550344 reboot: Restarting system
   21.549981 Reboot failed -- System halted
</source>

原因：未使能看门狗。系统 Restart 时，是利用取消喂狗来触发看门狗超时，从而引发复位。

修正： 内核配置时，选择 

  Device Drivers → Watchdog Timer Support  → WatchDog Timer Driver Core 和 Allwinner SoCs watchdog support

确保如下选项打开：

<source lang=bash>
CONFIG_WATCHDOG=y
CONFIG_WATCHDOG_CORE=y
CONFIG_WATCHDOG_HANDLE_BOOT_ENABLED=y
CONFIG_SUNXI_WATCHDOG=y
</source>

重新编译内核即可：

<source lang=bash>
$ make ARCH=arm CROSS_COMPILE=arm-linux-gnueabi- zImage -j8
</source>

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