linux-kernel - Re: [PATCH 1/2] printk: Track command line console positions to fix console order

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Message-ID: <ZmhYoV4ZrNwmIDS4@tlindgre-MOBL1>
Date: Tue, 11 Jun 2024 17:01:05 +0300
From: Tony Lindgren <tony.lindgren@...ux.intel.com>
To: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc: Petr Mladek <pmladek@...e.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	John Ogness <john.ogness@...utronix.de>,
	Sergey Senozhatsky <senozhatsky@...omium.org>,
	Tony Lindgren <tony@...mide.com>,
	Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>,
	linux-serial@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] printk: Track command line console positions to fix
 console order

On Tue, Jun 11, 2024 at 04:10:45PM +0300, Andy Shevchenko wrote:
> On Tue, Jun 11, 2024 at 12:56:54PM +0300, Tony Lindgren wrote:
> > On Tue, Jun 11, 2024 at 10:17:11AM +0200, Petr Mladek wrote:
> > >     I would expect:
> > > 
> > > 	serial8250:0.0	-> ttyS0
> > > 	serial8250:0.1	-> ttyS1
> > > 	serial8250:0.2	-> ttyS2
> > > 	[...]
> >  
> > I believe this would be the situation if you make CONFIG_ACPI is not set
> > in the .config.
> 
> This is interesting. So, we still have the DEVNAME differences depending on
> the kernel configuration? OTOH, I can't imagine either how we can get the
> device names more stable as long as some drivers instantiate the platform
> device instead of using 8250 core parts (port, base, core) directly.

Seems we can add translation as needed though. For example, we could add
console=serial8250:0.0 translation to the PNP port. Or console=0x3f8,115200.

Regards,

Tony