[Buildroot] [PATCH] systemd: let getty instead of serial-getty handle /dev/console
Peter Seiderer
ps.report at gmx.net
Thu Sep 22 18:50:12 UTC 2016
Hello Floris,
On Wed, 21 Sep 2016 23:47:02 +0200, Floris Bos <bos at je-eigen-domein.nl> wrote:
> On 09/21/2016 10:05 PM, Peter Seiderer wrote:
> > Hello *,
> >
> > On Wed, 21 Sep 2016 09:01:37 +0200, Peter Korsgaard <peter at korsgaard.com> wrote:
> >
> >>>>>>> "Yann" == Yann E MORIN <yann.morin.1998 at free.fr> writes:
> >> > Floris, All,
> >> > On 2016-09-09 18:10 +0200, Floris Bos spake thusly:
> >> >> The serial-getty unit depends on dev-%i.device which does not
> >> >> seem to be created for /dev/console
> >> >> Workaround this by letting normal getty unit handle things
> >> >> if BR2_TARGET_GENERIC_GETTY_PORT is set to 'console'
> >> >>
> >> >> Signed-off-by: Floris Bos <bos at je-eigen-domein.nl>
> >>
> >> > I haven't tested that, but I think this is OK just on principle.
> >>
> >> > I just wonder if that behaves correctly when console is a serial line or
> >> > anything else (e.g. a VT on HDMI, or through a debug channel...)
> >>
> >> Yeah, me too. Does anybody know what the difference exactly is between
> >> getty/serial-getty, and when one should be used over the other?
> >>
> > Tested for the rpi3/glibc/systemd case and failed: I get a doubled
> > (and unusable) ' Welcome to Buildroot/buildroot login:' on serial and
> > no login on hdmi...
>
> Empty cmdline.txt will give hdmi.
>
> Recall you need "console=serial0,115200 console=tty1" with tty1 last in
> cmdline.txt if you want them simultaneous.
Changed cmdline.txt to:
root=/dev/mmcblk0p2 rootwait console=ttyAMA0,115200 console=tty1
Which gives me two (functional) logins on serial and hdmi.
But I think changing package/rpi-firmware/cmdline.txt unconditional will
break the other Init systems, see commit log from last patch touching
cmdline.txt ([1):
...change BR2_TARGET_GENERIC_GETTY_PORT to "console", so it starts a
getty on the last console= passed to the kernel, ttyAMA0...
Regards,
Peter
[1] https://git.buildroot.net/buildroot/commit/?id=20878a1017e2bf7eb8c5f870dc6d2641493cb0f9
> So that tty1 becomes /dev/console and serial is handled by systemd's
> automatic getty generator.
>
> Perhaps there is an issue if you have the order swapped, and both
> systemd's automatic stuff and the manual symlink try to display a getty
> on serial.
> Not sure how to disable systemd's automatic behavior.
>
>
>
> Yours sincerely,
>
> Floris Bos
>
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