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Message-ID: <2b67927057455bc91310f88a1952f808339f14cb.camel@kernel.crashing.org>
Date: Thu, 14 May 2020 08:22:33 +1000
From: Benjamin Herrenschmidt <benh@...nel.crashing.org>
To: Petr Mladek <pmladek@...e.com>,
Alper Nebi Yasak <alpernebiyasak@...il.com>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Jiri Slaby <jslaby@...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>,
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 Wed, 2020-05-13 at 16:37 +0200, Petr Mladek wrote:
> The only common rules are:
>
> + The last console on the command line should always be the
> preferred one when defined.
>
> + Consoles defined by the device (SPCR, device tree) are used
> when there is no commandline.
With the exception that on x86, SPCR is only used for early_con, we
don't do add_preferred_console() at all for it.
I sort-of understand why... the track record on BIOS quality out there
being what it is, I could see this causing a number of systems start
sending the console to a non-existent or non-wired serial port instead
of the tty/gpu because the BIOS leave SPCR set/enabled for no reason.
It may or may not be the case in practice but I don't see how we can
figure that out without either a large campain of data collection from
tons of systems (which will miss plenty) or just taking the chance &
breaking people and see who screams :-)
Cheers,
Ben.
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