内核不断重启，串口打印信息如下，是什么原因呢？

[   14.839781] systemd-shutdown[1]: Syncing filesystems and block devices.
[   14.844389] systemd-shutdown[1]: Sending SIGTERM to remaining processes...
[   14.853899] systemd-journald[225]: Received SIGTERM from PID 1 (systemd-shutdow).
[   14.860146] systemd-shutdown[1]: Sending SIGKILL to remaining processes...
[   14.868470] systemd-shutdown[1]: Hardware watchdog 'Synopsys DesignWare Watchdog', version 0
[   14.872293] systemd-shutdown[1]: Unmounting file systems.
[   14.876212] [339]: Remounting '/' read-only in with options ''.
[   14.879276] systemd-shutdown[1]: All filesystems unmounted.
[   14.881723] systemd-shutdown[1]: Deactivating swaps.
[   14.884097] systemd-shutdown[1]: All swaps deactivated.
[   14.886442] systemd-shutdown[1]: Detaching loop devices.
[   14.890994] systemd-shutdown[1]: All loop devices detached.
[   14.893040] systemd-shutdown[1]: Detaching DM devices.
[   14.895101] systemd-shutdown[1]: All DM devices detached.
[   14.898680] systemd-shutdown[1]: Syncing filesystems and block devices.
[   14.901760] systemd-shutdown[1]: Rebooting.
[   14.903561] cpu cpu4: min=816000, max=816000
[   14.906771] cpu cpu0: min=816000, max=816000
[   14.918820] I : [File] : drivers/gpu/arm/midgard/platform/rk/mali_kbase_config_rk.c; [Line] : 274; [Func] : kbase_platform_rk_shutdown(); to make vdd_gpu enabled for turning off pd_gpu in pm_framework.
[   14.924824] rk-vcodec ff660000.rkvdec: shutdown
[   14.927475] rk-vcodec ff650000.vpu_service: shutdown
[   14.935788] reboot: Restarting system
DDR Version 1.24 20191016
In
soft reset
SRX
channel 0
CS = 0
MR0=0x18

我们使用的是LPDDR4 416MHZ

是加载到fedora的rootfs时候导致了重启，具体是什么原因呢

就是加载ext4超过maximal mount，导致了加载不成功fedora的根文件系统，导致后面重启了，具体是哪个硬件导致的呢？

Starting Toybrick teec daemon...
[   14.777233] EXT4-fs (mmcblk1p3): mounting ext2 file system using the ext4 subsystem
[   14.780949] EXT4-fs (mmcblk1p3): warning: maximal mount count reached, running e2fsck is recommended
[   14.786843] EXT4-fs (mmcblk1p3): mounted filesystem without journal. Opts: (null)
[  OK  ] Stopped target Timers.
[  OK  ] Stopped target Remote File Systems.
[  OK  ] Stopped target Remote File Systems (Pre).
         Starting Show Plymouth Reboot Screen...
[  OK  ] Stopped target Initrd Root Device.
[  OK  ] Stopped Toybrick teec daemon.
[  OK  ] Stopped target Initrd Root File System.
         Unmounting /sysroot...

你是直接用 Toybrick 给的固件刷写的吗？我刷写 Debian 的系统，开机日志没有输出到串口啊？需要系统内配置什么吗？