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Re: iTCO_wdt not finding device

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OK, I looked at the source for this module:
https://github.com/torvalds/linux/blob/master/drivers/watchdog/iTCO_wdt.c

Unless the latest version has changed drastically from 5.10.0-21, then I
should be seeing an error of some sort if it is running the probe function
iTCO_wdt_probe(). Every return in that function before "Found a %s TCO
device" is an error. What would cause the probe not to run at all?

Also, I tried disabling secure boot to no avail.

Thanks,
Perry

On Wed, Mar 8, 2023 at 11:00 AM Perry Naseck <mailinglists@perrynaseck.com>
wrote:

> Hello!
>
> I cannot get the iTCO_wdt device to be found. I'm not sure how else to
> troubleshoot at this point, so any help with that is appreciated (i.e. a
> way to manually check if the device exists or etc.).
>
> I am using Debian 11 on an Intel NUC CMCR1ABB chassis with a CM11EBi716W
> module. This is an i7 and the watchdog is enabled in the BIOS. I am using
> the latest BIOS v71. Kernel: 5.10.0-21-amd64 #1 SMP Debian 5.10.162-1
> (2023-01-21) x86_64 GNU/Linux.
>
> Every single time I run "modprobe iTCO-wdt" I see in dmesg:
>     iTCO_vendor_support: vendor-support=0
>     iTCO_wdt: Intel TCO WatchDog Timer Driver v1.11
> And that's it. No device found and no new /dev/watchdog devices or
> anything new in wdctl.
>
> I have tried:
>   1. Simply "modprobe iTCO-wdt"
>   2. Also loading "i2c-i801" and "i2c-smbus" first and then loading the
> module
>   3. Blacklisting wdat_wdt and adding nmi_watchdog=0 to GRUB, which
> correctly caused the existing /dev/watchdog software device to disappear
> but iTCO_wdt still didn't work
>
> I found one other user with the same issue several years go:
> https://forums.debian.net/viewtopic.php?t=146358
>
> I'm very certain that this device supports the watchdog, as there is a
> BIOS option to enable it and Intel has a Windows daemon to make use of it.
> Is there another Intel watchdog scheme besides iTCO_wdt? Would secureboot
> lockdown be interfering with this?
>
> Thanks,
> Perry
>

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Thread

iTCO_wdt not finding device Perry Naseck <mailinglists@perrynaseck.com> - 2023-03-08 17:20 +0100
  Re: iTCO_wdt not finding device Perry Naseck <mailinglists@perrynaseck.com> - 2023-03-08 19:00 +0100
    Re: iTCO_wdt not finding device Perry Naseck <mailinglists@perrynaseck.com> - 2023-03-08 21:30 +0100
      Re: iTCO_wdt not finding device Perry Naseck <mailinglists@perrynaseck.com> - 2023-03-09 04:10 +0100

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