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

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.

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.

--
Chris Adams <linux@cmadams.net>
--
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