[fedora-arm] Re: Disabling serial console in u-boot

On Fri, 1 Nov 2024 at 17:36, Chris Adams via arm
<arm@lists.fedoraproject.org> wrote:
>
> Once upon a time, Peter Robinson <pbrobinson@gmail.com> said:
> > Can you clarify this? The "stop at u-boot about 20-30 seconds after
> > boot" doesn't make sense, you should be well into the kernel and even
> > login after 20-30 seconds, well past U-Boot. Also not sure how PPS on
> > a gpio would affect early boot.
>
> Oh it boots fine, then crashes after about 20-30 seconds back to a
> u-boot prompt. IIRC when I hooked up a monitor, I didn't see any kernel
> oops, just back to u-boot.
>
> https://bugzilla.redhat.com/show_bug.cgi?id=2264560
>
> It's very weird, and I'm just speculating that the 20-30 seconds is
> about how long it takes for the GPS HAT to start sending PPS pulses.

Oh yes, I remember that one now.

> I need to swap out the SD card for a clean Fedora 41 server image and
> see if it still happens (I expect it will since kernel 6.11 on F39 still
> does). I was kind of hoping I could reproduce it with the other GPS
> HAT, but it doesn't happen there. That's when I thought about the
> difference between the two being which GPIO PIN the PPS signal is on
> (think I had it backwards before - the one that crashes has PPS on the
> default pin, 18, while the one that doesn't has PPS on GPIO pin 4).
>
> It doesn't make much sense for the GPIO PPS signal to be the issue (even
> when the overlay configuring PPS isn't loaded), but... not sure what
> else it might be. The only other difference between the two HATs is
> that the one on the crashing Pi has an integrated RTC, while the other
> one does not.

What's the integrated RTC? Does it have an integrated watchdog
feature? I wonder if the kernel driver had a update to enable a
watchdog or some similar feature on the RTC and it's triggering a
reset because something isn't clearing it as the HW is expecting.
--
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