linux-kernel - Re: [PATCH 0/2] Add support for Gunyah Watchdog

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Message-ID: <e469548a-8d74-4d3b-9617-2b06f36013e2@oss.qualcomm.com>
Date: Tue, 23 Dec 2025 18:50:41 +0100
From: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
To: Alexander Koskovich <AKoskovich@...me>,
        Pavan Kondeti <pavan.kondeti@....qualcomm.com>,
        Bjorn Andersson <andersson@...nel.org>
Cc: Neil Armstrong <neil.armstrong@...aro.org>,
        hrishabh.rajput@....qualcomm.com,
        Konrad Dybcio <konradybcio@...nel.org>,
        Wim Van Sebroeck <wim@...ux-watchdog.org>,
        Guenter Roeck
 <linux@...ck-us.net>, Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley
 <conor+dt@...nel.org>, linux-arm-msm@...r.kernel.org,
        linux-watchdog@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/2] Add support for Gunyah Watchdog

On 12/22/25 8:02 PM, Alexander Koskovich wrote:
> 
> On 9/4/25 1:05 PM, Pavan Kondeti wrote:
>> Thanks for asking this question. I believe the overlay part needs some
>> discussion here.
>>
>> I have tried this series on 8550 MTP. The overlay failed, so watchdog
>> device did not probe. same is the case with 8750 too. It works only
>> after applying this patch. I will test and report my observation on 8650
>> later.
> 
> Hi Pavan, was linked this thread after seeing what I think to be the 
> same issue on another platform,
> but issue is a bit more serious here since bootloader fails to find a 
> DTB at all, not just overlay fails.
> When the "arch_timer" label is missing from the base DTB on Milos, 
> ufdt_apply_overlay in bootloader
> will fail and it looks like the DTB memory gets corrupted. If you are 
> booting without a dtbo image,
> then you don't see the issue. Couple logs from bootloader when it happens:
> 
>      ApplyOverlay: ufdt apply overlay failed

FWIW this comes from ABL, which is open source

https://git.codelinaro.org/clo/la/abl/tianocore/edk2/

You can probably deduce the correct tag from the boot logs

Konrad