linux-kernel - Re: [RFC PATCH v2 0/3] Prefer working VT console over SPCR and device-tree chosen stdout-path

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Date:   Fri, 1 May 2020 10:30:44 +0900
From:   Sergey Senozhatsky <sergey.senozhatsky@...il.com>
To:     Alper Nebi Yasak <alpernebiyasak@...il.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jslaby@...e.com>, Petr Mladek <pmladek@...e.com>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        linux-serial@...r.kernel.org, Steven Rostedt <rostedt@...dmis.org>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Arvind Sankar <nivedita@...m.mit.edu>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Daniel Vetter <daniel.vetter@...ll.ch>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Biggers <ebiggers@...gle.com>,
        Feng Tang <feng.tang@...el.com>,
        Grzegorz Halat <ghalat@...hat.com>,
        Lukas Wunner <lukas@...ner.de>,
        Nicolas Pitre <nico@...xnic.net>,
        Sam Ravnborg <sam@...nborg.org>
Subject: Re: [RFC PATCH v2 0/3] Prefer working VT console over SPCR and
 device-tree chosen stdout-path

On (20/04/30 19:14), Alper Nebi Yasak wrote:
>                     |     "console=tty0"    |    (no console arg)   |
>   ------------------+-----------------------+-----------------------+
>   QEMU VM           | tty0     -WU (EC p  ) | ttyAMA0  -W- (EC   a) |
>   (w/ SPCR)         | ttyAMA0  -W- (E    a) |                       |
>   ------------------+-----------------------+-----------------------+
>   Chromebook Plus   | tty0     -WU (EC p  ) | ttyS2    -W- (EC p a) |
>   (w/ stdout-path)  |                       | tty0     -WU (E     ) |
>   ------------------+-----------------------+-----------------------+
>   Chromebook Plus   | tty0     -WU (EC p  ) | tty0     -WU (EC p  ) |
>   (w/o either)      |                       |                       |
>   ------------------+-----------------------+-----------------------+
> 
> This patchset tries to ensure that VT is preferred in those conditions
> even in the presence of firmware-mandated serial consoles. These should
> cleanly apply onto next-20200430.

Well, if there is a "mandated console", then why would we prefer
any other console?

	-ss