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

Once upon a time, Peter Robinson <pbrobinson@gmail.com> said:
> Oh yes, I remember that one now.

Heh I do find the weird problems.

> > 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.

The RTC is an rv3028. The GPS HAT is the Uputronics GPS/RTC board.

I do normally have the watchdog service running, configured for
/dev/watchdog (habit on headless servers which is how I'm using this).
I only see /dev/watchdog0, which is the Pi's BCM2835 watchdog.

The reboot does also happen with a default config.txt, which means the
RTC and PPC aren't configured and recognized by the kernel.

I'll start with a plain clean F41 server image on a different card, hook
up a monitor, start from a cold boot, and see what I can see.

Thanks for your help. I've used Linux on non-x86 type hardware, but not
in a long time, and not like ARM until more recently, so still a
learning curve for me.
--
Chris Adams <linux@cmadams.net>
--
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