linux-kernel - Re: How to enable output to serial console at run-time?

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Message-ID: <677939ab-22d3-d220-46fd-0f45be6c9226@molgen.mpg.de>
Date:   Thu, 2 Nov 2017 20:01:07 +0100
From:   Paul Menzel <pmenzel+linux-serial@...gen.mpg.de>
To:     Greg KH <gregkh@...uxfoundation.org>
Cc:     linux-serial@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: How to enable output to serial console at run-time?

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