1.核心板正常使用，在某次上电之后，无法正常启动，异常时Log表现如下：
2.按照如下操作修改启动项之后，ORIN NX 8G正常启动；
将OS chain A status 由 Unbootable修改为Normal 模式，即可正常启动。
请问，这个无法启动的根本原因是什么？如何避免这个问题发生，这个概率不高，目前不能有效复现问题。
Hi liupeng21,
Is there any error in serial console before it can not boot?
If not, please refer to Q: Why my device enters into recovery boot after successive reboots? for details.
You might reboot too fast to cause system thought you chain-A is unbootable.
1.这个启动失败之前没有捕捉到具体的Log，没办法确认；
2.nv-l4t-bootloader-config.service 这个具体是配置什么用的？
Okay, do you know how to reproduce this behavior?
It is a system service to confirm if the system boots successful and also configure few EFI variables.
You can refer to the link for its logic.
那我有个问题，如果这个系统服务（nv-l4t-bootloader-config.service）没有启动，然后系统开机后检测到其他异常，然后系统重新启动，触发了这个异常。
Have you checked Reset Timing of Boot Retry Count - #7 by KevinFFF for its logic?
Actually, there is a retry_count configured in L4TLauncher before kernel loaded and nv-l4t-bootloader-config.service will reset it if boot completed.
If there’s the issue about this service not working as expected and other errors trigger the reboot for 3 times by default, it would also enter into recovery kernel. It should be the expected behavior since there’s the errors during boot up.
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