Re: [poky] [PATCH 2/4] genericarm64.conf: add AMD Kria KV260 serial consoles

On 29 Oct 2024, at 12:10, Mikko Rapeli <[email protected]> wrote:
> 
> On Tue, Oct 29, 2024 at 11:58:09AM +0000, Ross Burton wrote:
>> On 29 Oct 2024, at 08:05, Mikko Rapeli via lists.yoctoproject.org <[email protected]> wrote:
>>> 
>>> Current practice is to add new device serial devices to
>>> SERIAL_CONSOLES. Enables testing and test automation with
>>> the board. Note that SERIAL_CONSOLES get added to /etc/inittab
>>> and missing physical serial consoles causes respawn warnings
>>> at runtime:
>>> 
>>> INIT: Id "S0" respawning too fast: disabled for 5 minutes
>>> INIT: Id "S1" respawning too fast: disabled for 5 minutes
>> 
>> The use of ttyrun should avoid the respawning issue, have you confirmed this still happens? If so, any idea why?
> 
> This is happening with very recent poky master builds with sysvinit, the default.
> 
> https://ledge.validation.linaro.org/scheduler/job/95628
> 
>    Starting syslogd/klogd: done
> 
>    INIT: Id "S1" respawning too fast: disabled for 5 minutes
> 
>    INIT: Id "S0" respawning too fast: disabled for 5 minutes
>    Poky (Yocto Project Reference Distro) 5.1 genericarm64 /dev/ttyPS1
> 
> Alternatively testing could focus on systemd init, or the issue is just ignored.
> Or udev based agetty starter is developed. For generic images, it should not be
> necessary to define all serial consoles via SERIAL_CONSOLES at build time.
> Kernel has a lot more drivers enabled.

Better solutions for sysv appreciated: hardcoding the list at boot time _is_ madness.  Something involving a udev triggers sounds like a better solution long term, for sure.

However, ttyrun really should be stopping this, so I’m curious what the problem is and whether the xilinx tty driver is a bit broken.

Ross