linux-kernel - [PATCH v8 4/4] Documentation/serial-console: Document CONFIG_NULL_TTY_DEFAULT

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Message-ID: <20250311033133.1859963-5-adamsimonelli@gmail.com>
Date: Mon, 10 Mar 2025 23:31:33 -0400
From: adamsimonelli@...il.com
To: linux-serial@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Jiri Slaby <jirislaby@...nel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Andy Shevchenko <andy.shevchenko@...il.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	John Ogness <john.ogness@...utronix.de>,
	Sergey Senozhatsky <senozhatsky@...omium.org>,
	Petr Mladek <pmladek@...e.com>
Cc: Adam Simonelli <adamsimonelli@...il.com>
Subject: [PATCH v8 4/4] Documentation/serial-console: Document CONFIG_NULL_TTY_DEFAULT_CONSOLE.

From: Adam Simonelli <adamsimonelli@...il.com>

When the kernel is compiled with CONFIG_NULL_TTY_DEFAULT_CONSOLE and
no console= options are selected, it defaults to using the ttynull
device.
---
 Documentation/admin-guide/serial-console.rst | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/Documentation/admin-guide/serial-console.rst b/Documentation/admin-guide/serial-console.rst
index a3dfc2c66e01..1609e7479249 100644
--- a/Documentation/admin-guide/serial-console.rst
+++ b/Documentation/admin-guide/serial-console.rst
@@ -78,7 +78,9 @@ If no console device is specified, the first device found capable of
 acting as a system console will be used. At this time, the system
 first looks for a VGA card and then for a serial port. So if you don't
 have a VGA card in your system the first serial port will automatically
-become the console.
+become the console, unless the kernel is configured with the
+CONFIG_NULL_TTY_DEFAULT_CONSOLE option, then it will default to using the
+ttynull device.
 
 You will need to create a new device to use ``/dev/console``. The official
 ``/dev/console`` is now character device 5,1.
-- 
2.45.2