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Date:   Thu, 2 Nov 2017 22:29:12 +0000
From:   Alan Cox <gnomes@...rguk.ukuu.org.uk>
To:     Paul Menzel <pmenzel+linux-serial@...gen.mpg.de>
Cc:     Greg KH <gregkh@...uxfoundation.org>, linux-serial@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: How to enable output to serial console at run-time?

On Thu, 2 Nov 2017 20:01:07 +0100
Paul Menzel <pmenzel+linux-serial@...gen.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

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