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

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Message-ID: <93b11bd3-6ae1-f710-d151-748ce392d666@sgi.com>
Date:   Mon, 7 Nov 2016 09:40:32 -0600
From:   Nathan Zimmer <nzimmer@....com>
To:     "Maciej W. Rozycki" <macro@...ux-mips.org>,
        Peter Hurley <peter@...leysoftware.com>
CC:     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 11/05/2016 06:44 PM, Maciej W. Rozycki wrote:
> 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

Given they hid some of the setting in the bios to keep these boxes 
uniform I will have to talk with the bios guys more about that.
Last time they were certain it wasn't a big deal.

Thanks,
Nate