From: Alan Cox <gnomes@lxorguk.ukuu.org.uk>
To: Paul Menzel <pmenzel+linux-serial@molgen.mpg.de>
Cc: Greg KH <gregkh@linuxfoundation.org>,
linux-serial@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: How to enable output to serial console at run-time?
Date: Thu, 2 Nov 2017 22:29:12 +0000 [thread overview]
Message-ID: <20171102222912.3d0bd8ad@alans-desktop> (raw)
In-Reply-To: <677939ab-22d3-d220-46fd-0f45be6c9226@molgen.mpg.de>
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
prev parent reply other threads:[~2017-11-02 22:29 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
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 message]
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