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From:   Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Date:   Fri, 1 May 2020 10:30:44 +0900
To:     Alper Nebi Yasak <alpernebiyasak@gmail.com>
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Jiri Slaby <jslaby@suse.com>, Petr Mladek <pmladek@suse.com>,
        Sergey Senozhatsky <sergey.senozhatsky@gmail.com>,
        linux-serial@vger.kernel.org, Steven Rostedt <rostedt@goodmis.org>,
        linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org,
        Andrew Morton <akpm@linux-foundation.org>,
        Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
        Arvind Sankar <nivedita@alum.mit.edu>,
        Benjamin Herrenschmidt <benh@kernel.crashing.org>,
        Daniel Vetter <daniel.vetter@ffwll.ch>,
        "David S. Miller" <davem@davemloft.net>,
        Eric Biggers <ebiggers@google.com>,
        Feng Tang <feng.tang@intel.com>,
        Grzegorz Halat <ghalat@redhat.com>,
        Lukas Wunner <lukas@wunner.de>,
        Nicolas Pitre <nico@fluxnic.net>,
        Sam Ravnborg <sam@ravnborg.org>
Subject: Re: [RFC PATCH v2 0/3] Prefer working VT console over SPCR and
 device-tree chosen stdout-path
Message-ID: <20200501013044.GA288759@jagdpanzerIV.localdomain>
References: <20200430161438.17640-1-alpernebiyasak@gmail.com>
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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