linux-kernel - Re: console issue since 3.6, console=ttyS1 hangs

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Date:   Sat, 5 Nov 2016 23:44:34 +0000 (GMT)
From:   "Maciej W. Rozycki" <macro@...ux-mips.org>
To:     Peter Hurley <peter@...leysoftware.com>
cc:     Nathan Zimmer <nzimmer@....com>, Sean Young <sean@...s.org>,
        Linux kernel mailing list <linux-kernel@...r.kernel.org>,
        "linux-serial@...r.kernel.org" <linux-serial@...r.kernel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Alan Cox <alan@...ux.intel.com>,
        "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>
Subject: Re: console issue since 3.6, console=ttyS1 hangs

On Fri, 4 Nov 2016, Peter Hurley wrote:

> > These bios screens do not have any mention of PNP settings.
> > I am getting output over the console (via ipmi) until the boot hangs.
> 
> Yeah, probably the device actually decodes io address access anyway,
> but in the disabled state probably has not routed IRQ.
> 
> I have no idea how to help you with the bios, sorry.

 I'd look out for serial port, Super-I/O or COM1 port (which is how PC-DOS 
named the device some 35 years ago) settings rather than anything to do 
with PNP.  Typically you'd be able to choose from a few classic combined 
I/O space address and IRQ assignments in addition to a `Disabled' setting.

 There might be a genuine BIOS bug there as well of course as serial ports 
seem to be less used these days and the issue may have escaped validation.

  Maciej