Watchdog Reboot Detection Issue on BX-21A Hardware

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Erdogan, Fatih Alperen

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Nov 25, 2025, 4:12:01 AM (yesterday) Nov 25

to efibootg...@googlegroups.com, cedric.h...@siemens.com, Cakir, Erhan Recep, Cetin, Gokhan

Hello,

I am writing to report an issue we have encountered with Efibootguard(v0.21) on BX-21A hardware, where watchdog reboots are not being properly detected.

Issue Description:

After a watchdog reboot, the system fails to detect and report the reset event on subsequent boot.

We have identified that the watchdog configuration in "efibootguard/drivers/watchdog/ipcbx21a.c" is preventing proper watchdog reboot detection.

Observed Behavior:

The bootstatus file (/sys/class/watchdog/watchdog0/bootstatus) does not show any flags indicating a watchdog reset

Expected Behavior:

The bootstatus file should display flags indicating a watchdog reset

Thank you for your assistance.

Best regards,

Fatih Alperen Erdoğan

cedric.h...@siemens.com

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Nov 25, 2025, 5:05:37 AM (yesterday) Nov 25

to Erdogan, Fatih Alperen, efibootg...@googlegroups.com, Cakir, Erhan Recep, Cetin, Gokhan

On Tue, 2025-11-25 at 09:11 +0000, Erdoğan, Fatih Alperen (FT D EU TR

C&E IE 4) wrote:
>
>
> Hello,
>
> I am writing to report an issue we have encountered with
> Efibootguard(v0.21) on BX-21A hardware, where watchdog reboots are
> not being properly detected.
>
> Issue Description:

> * After a watchdog reboot, the system fails to detect and report the

> reset event on subsequent boot.
> We have identified that the watchdog configuration in
> "efibootguard/drivers/watchdog/ipcbx21a.c" is preventing proper
> watchdog reboot detection.
>
> Observed Behavior:

> * The bootstatus file (/sys/class/watchdog/watchdog0/bootstatus)

> does not show any flags indicating a watchdog reset

thanks for reporting. in the future, please use plain/text rather than
HTML

I will investigate (will need to get my hands on the hardware
documentation to make sure it is ok to program the watchdog without
getting/clearing the status flag)

>
> Expected Behavior:
> * The bootstatus file should display flags indicating a watchdog
> reset

Your mileage may vary from one device/driver to another. Not all
watchdog implementations may provide that information reliably (in
other words, while we may be able to fix this issue for BX-21A, other
devices may not support this bootstatus file)

>
> Thank you for your assistance.
>
> Best regards,
>
> Fatih Alperen Erdoğan
>