linux-kernel - Re: post 3.14 serial regression

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Date:	Wed, 09 Apr 2014 14:19:34 -0700
From:	Dave Hansen <dave.hansen@...el.com>
To:	Geert Uytterhoeven <geert@...ux-m68k.org>,
	Dave Hansen <dave@...1.net>
CC:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>,
	Geert Uytterhoeven <geert+renesas@...ux-m68k.org>,
	LKML <linux-kernel@...r.kernel.org>,
	linux-serial@...r.kernel.org, Jiri Slaby <jslaby@...e.cz>
Subject: Re: post 3.14 serial regression

On 04/09/2014 01:59 PM, Geert Uytterhoeven wrote:
> On Wed, Apr 9, 2014 at 10:04 PM, Dave Hansen <dave@...1.net> wrote:
>> On 04/09/2014 12:41 PM, Geert Uytterhoeven wrote:
>>> Dave: If I understand it correctly, you use console=ttyS2, while the kernel
>>> suddenly changed the order of the serial devices, so your port is no
>>> longer ttyS2, but ttyS4. Hence the serial port is not found, and
>>> uart_remove_one_port() is called on it, taking away your /dev/console for
>>> userspace?
>>
>> Right.
> 
> Does it work with console=ttyS4?

Yes, after raising SERIAL_8250_NR_UARTS to >=6.  It had been set to 4
(the Kconfig default).

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