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

[Konrad Dybcio]

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