IMX6 Watchdog does not reset when kernel boot hangs

取消
显示结果 
显示  仅  | 搜索替代 
您的意思是: 

IMX6 Watchdog does not reset when kernel boot hangs

3,116 次查看
vladzouth
Contributor II

I'am working on a custom board based on IMX6Solo processor and TX6S-8035 module from KARO. I would like to enable watchdog. I build an image with fsl-comminuty-bsp (krogoth) and enable watchdog which is available as /dev/watchdog - /dev/watchdog0. I enable watchdog by passing watchdog parameters on kernel command line :

noinitrd console=ttymxc1,115200 ro debug panic=1 root=PARTUUID=0cc66cc0-02 rootwait earlyprintk=serial,ttymxc1,115200 imx2-wdt.nowayout imx2-wdt.timeout=45 

I implemented to the watchdog service to kick the watchdog so that reboot can't be happens on normal using. When i stop watchdog service, the system reboot and i can see that this is du to watchdog reset. But sometimes, the kernel boot hangs and the watchdog don't reboot the system.

Does somebody has any idea for the issue
Best regards,

Vladzouth

标签 (5)
0 项奖励
3 回复数

2,639 次查看
vladzouth
Contributor II

Hi Yuri,

Thank you for the response.
I do not understand what do you means about removing power? I use a custom board based on tx6s-8035 SOM and the components are physically connected. I can not isolate the SOM power from the rest of circuit.
To come back on my issue, the watchdog reset is ok when the system boot succeeds and the services are running but when the kernel stucks on boot somewhere, the watchdog reset does not work. 

0 项奖励

2,639 次查看
Yuri
NXP Employee
NXP Employee

Hello,

  generally i.MX6 has no WDOG issues, except may be erratum ERR005768

(ROM: In rare cases, secondary image boot flow may not work due to
mis-sampling of the WDOG reset).

https://www.nxp.com/docs/en/errata/IMX6SDLCE.pdf 

   Perhaps, in Your case the WDOG reset occurs, but because of the mentioned

problems concerning improper states of external components, critical for rebooting,

the system hangs. 

Regards,

Yuri.

0 项奖励

2,639 次查看
Yuri
NXP Employee
NXP Employee

Hello,

 

      It is highly recommended to remove power (voltage source) for all components on
board even only  a processor reset occurs. This avoids problems concerning improper

states of external components, critical for rebooting the processor.

So, the POR may be recommended for reboot (via WDOG).

 

Have a great day,

Yuri

 

------------------------------------------------------------------------------

Note: If this post answers your question, please click the Correct Answer

button. Thank you!

0 项奖励