From: Alper Nebi Yasak <alpernebiyasak@gmail•com>
To: Andy Shevchenko <andy.shevchenko@gmail•com>
Cc: Petr Mladek <pmladek@suse•com>, Feng Tang <feng.tang@intel•com>,
Benjamin Herrenschmidt <benh@kernel•crashing.org>,
Eric Biggers <ebiggers@google•com>,
Greg Kroah-Hartman <gregkh@linuxfoundation•org>,
Nicolas Pitre <nico@fluxnic•net>,
Linux Kernel Mailing List <linux-kernel@vger•kernel.org>,
Steven Rostedt <rostedt@goodmis•org>,
Daniel Vetter <daniel.vetter@ffwll•ch>,
Sergey Senozhatsky <sergey.senozhatsky@gmail•com>,
Arvind Sankar <nivedita@alum•mit.edu>,
Grzegorz Halat <ghalat@redhat•com>,
"open list:SERIAL DRIVERS" <linux-serial@vger•kernel.org>,
Jiri Slaby <jslaby@suse•com>, Lukas Wunner <lukas@wunner•de>,
Andrew Morton <akpm@linux-foundation•org>,
Andy Shevchenko <andriy.shevchenko@linux•intel.com>,
Sam Ravnborg <sam@ravnborg•org>,
"David S. Miller" <davem@davemloft•net>,
linux-arm Mailing List <linux-arm-kernel@lists•infradead.org>
Subject: Re: [RFC PATCH v2 0/3] Prefer working VT console over SPCR and device-tree chosen stdout-path
Date: Fri, 1 May 2020 18:07:10 +0300 [thread overview]
Message-ID: <3cd630dd-9bb9-e975-7466-c3125aa6afa3@gmail.com> (raw)
In-Reply-To: <CAHp75VeZRwUp+CpOct4dCAQAfyJZBAY7=qSKwRQh935KEMWw+g@mail.gmail.com>
On 01/05/2020 16:16, Andy Shevchenko wrote:
> On Fri, May 1, 2020 at 2:11 PM Alper Nebi Yasak
> <alpernebiyasak@gmail•com> wrote:
>> I'm assuming "by default" here means "without console arguments"
>> regardless of firmware requests. This paragraph (with small changes) is
>> repeated on many other Kconfig descriptions (drivers/tty/serial/Kconfig,
>> drivers/tty/serial/8250/Kconfig, arch/sparc/Kconfig from grepping for
>> '/dev/tty0' on **/Kconfig).
>>
>> From Documentation/admin-guide/serial-console.rst:
>>
>>> You can specify multiple console= options on the kernel command line.
>>> [...]
>>> Note that you can only define one console per device type (serial, video).
>>>
>>> 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.
>>
>> and later on:
>>
>>> Note that if you boot without a ``console=`` option (or with
>>> ``console=/dev/tty0``), ``/dev/console`` is the same as ``/dev/tty0``.
>>> In that case everything will still work.
>
> I'm wondering if behaviour is changed if you put console=tty1 instead
> of console=tty0.
Just tested again with the QEMU aarch64 VM. Comparing console=tty1 and
console=tty0 cases: /proc/consoles has tty1 instead of tty0 (both also
has ttyAMA0), and `echo '/dev/console is here' >>/dev/console` goes to
vt1 instead of the currently visible vt. Same difference before and
after this patchset.
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next prev parent reply other threads:[~2020-05-01 15:07 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-04-30 16:14 [RFC PATCH v2 0/3] Prefer working VT console over SPCR and device-tree chosen stdout-path Alper Nebi Yasak
2020-04-30 16:14 ` [RFC PATCH v2 1/3] printk: Add function to set console to preferred console's driver Alper Nebi Yasak
2020-04-30 16:46 ` Andy Shevchenko
2020-05-01 1:44 ` Sergey Senozhatsky
2020-05-01 11:48 ` Alper Nebi Yasak
2020-05-13 5:35 ` Sergey Senozhatsky
2020-05-24 10:01 ` Daniel Vetter
2020-04-30 16:14 ` [RFC PATCH v2 2/3] vt: Set as preferred console when a non-dummy backend is bound Alper Nebi Yasak
2020-04-30 16:14 ` [RFC PATCH v2 3/3] printk: Preset tty0 as a pseudo-preferred console Alper Nebi Yasak
2020-04-30 16:44 ` [RFC PATCH v2 0/3] Prefer working VT console over SPCR and device-tree chosen stdout-path Andy Shevchenko
2020-04-30 19:32 ` Alper Nebi Yasak
2020-05-01 1:30 ` Sergey Senozhatsky
2020-05-01 11:08 ` Alper Nebi Yasak
2020-05-01 13:16 ` Andy Shevchenko
2020-05-01 15:07 ` Alper Nebi Yasak [this message]
2020-05-13 14:37 ` Petr Mladek
2020-05-13 22:22 ` Benjamin Herrenschmidt
2020-05-15 19:27 ` Alper Nebi Yasak
2020-05-25 13:04 ` Petr Mladek
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