* How to enable output to serial console at run-time?
@ 2017-11-02 15:39 Paul Menzel
2017-11-02 16:53 ` Greg KH
0 siblings, 1 reply; 4+ messages in thread
From: Paul Menzel @ 2017-11-02 15:39 UTC (permalink / raw)
To: linux-serial; +Cc: linux-kernel
Dear Linux folks,
If I want to output the Linux kernel messages to the serial console, but
the `console=ttyS…` line is missing on the Linux command line, is there
a way to activate that during run-time by, for example, using the sysfs
interface?
Kind regards,
Paul
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: How to enable output to serial console at run-time?
2017-11-02 15:39 How to enable output to serial console at run-time? Paul Menzel
@ 2017-11-02 16:53 ` Greg KH
2017-11-02 19:01 ` Paul Menzel
0 siblings, 1 reply; 4+ messages in thread
From: Greg KH @ 2017-11-02 16:53 UTC (permalink / raw)
To: Paul Menzel; +Cc: linux-serial, linux-kernel
On Thu, Nov 02, 2017 at 04:39:36PM +0100, Paul Menzel wrote:
> Dear Linux folks,
>
>
> If I want to output the Linux kernel messages to the serial console, but the
> `console=ttyS…` line is missing on the Linux command line, is there a way to
> activate that during run-time by, for example, using the sysfs interface?
Why not change the command line to enable it properly?
thanks,
greg k-h
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: How to enable output to serial console at run-time?
2017-11-02 16:53 ` Greg KH
@ 2017-11-02 19:01 ` Paul Menzel
2017-11-02 22:29 ` Alan Cox
0 siblings, 1 reply; 4+ messages in thread
From: Paul Menzel @ 2017-11-02 19:01 UTC (permalink / raw)
To: Greg KH; +Cc: linux-serial, linux-kernel
Dear Greg,
Am 02.11.2017 um 17:53 schrieb Greg KH:
> On Thu, Nov 02, 2017 at 04:39:36PM +0100, Paul Menzel wrote:
>> If I want to output the Linux kernel messages to the serial console, but the
>> `console=ttyS…` line is missing on the Linux command line, is there a way to
>> activate that during run-time by, for example, using the sysfs interface?
>
> Why not change the command line to enable it properly?
Sometimes it’s not possible or very inconvenient to reboot the system.
Kind regards,
Paul
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: How to enable output to serial console at run-time?
2017-11-02 19:01 ` Paul Menzel
@ 2017-11-02 22:29 ` Alan Cox
0 siblings, 0 replies; 4+ messages in thread
From: Alan Cox @ 2017-11-02 22:29 UTC (permalink / raw)
To: Paul Menzel; +Cc: Greg KH, linux-serial, linux-kernel
On Thu, 2 Nov 2017 20:01:07 +0100
Paul Menzel <pmenzel+linux-serial@molgen.mpg.de> wrote:
> Dear Greg,
>
>
> Am 02.11.2017 um 17:53 schrieb Greg KH:
> > On Thu, Nov 02, 2017 at 04:39:36PM +0100, Paul Menzel wrote:
>
> >> If I want to output the Linux kernel messages to the serial console, but the
> >> `console=ttyS…` line is missing on the Linux command line, is there a way to
> >> activate that during run-time by, for example, using the sysfs interface?
> >
> > Why not change the command line to enable it properly?
>
> Sometimes it’s not possible or very inconvenient to reboot the system.
Try "man 2 ioctl_tty"
Alan
^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2017-11-02 22:29 UTC | newest]
Thread overview: 4+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2017-11-02 15:39 How to enable output to serial console at run-time? Paul Menzel
2017-11-02 16:53 ` Greg KH
2017-11-02 19:01 ` Paul Menzel
2017-11-02 22:29 ` Alan Cox
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).