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

I have a couple of Raspberry Pi 4Bs with a couple of different GPS HATs.
Both GPS HATs work similar - they use the main serial port pins to
transmit the NMEA sentences, several every second once they have GPS
sync. Since u-boot stops on serial input, this keeps them from booting
unattended.

With a fresh Fedora 41 install, I see u-boot start and then get the EFI
boot menu, which stops until I hit ENTER when the GPS HAT is attached.

I tried setting bootdelay to -2 but that seems to stop the EFI boot menu
from autobooting no matter what (e.g. pulled the HAT off and it still
stopped there).

I also changed stdin/stdout/stderr to remove serial, that didn't seem to
have any effect.

I assume people don't have these problems with the "official" Raspberry
Pi OS - do they build u-boot with different options from Fedora that
allow fully disabling the u-boot serial console mode?
--
Chris Adams <linux@cmadams.net>
--
_______________________________________________
arm mailing list -- arm@lists.fedoraproject.org
To unsubscribe send an email to arm-leave@lists.fedoraproject.org
Fedora Code of Conduct: https://docs.fedoraproject.org/en-US/project/code-of-conduct/
List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines
List Archives: https://lists.fedoraproject.org/archives/list/arm@lists.fedoraproject.org
Do not reply to spam, report it: https://pagure.io/fedora-infrastructure/new_issue