From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756966AbcJ3QBp (ORCPT ); Sun, 30 Oct 2016 12:01:45 -0400 Received: from relay2.sgi.com ([192.48.180.65]:46639 "EHLO relay.sgi.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1752089AbcJ3QBn (ORCPT ); Sun, 30 Oct 2016 12:01:43 -0400 Subject: Re: console issue since 3.6, console=ttyS1 hangs To: Sean Young References: <20161019090719.GA1764@gofer.mess.org> <29b311e3-a26e-81de-82cf-e0a202db6d96@sgi.com> <20161020201051.GA29324@gofer.mess.org> <49f038af-5cb7-e76f-e4e9-57fad876710d@sgi.com> <20161024135235.GA29984@gofer.mess.org> <20161024214925.GA143272@stormcage.americas.sgi.com> <20161025204139.GA22268@gofer.mess.org> <20161027201916.GA7718@gofer.mess.org> <20161028194225.GA233549@stormcage.americas.sgi.com> <20161029211647.GA25740@gofer.mess.org> CC: , , , , "Rafael J. Wysocki" From: Nathan Message-ID: <532703ec-357f-24a9-cd0e-268d0430e194@sgi.com> Date: Sun, 30 Oct 2016 11:01:39 -0500 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.4.0 MIME-Version: 1.0 In-Reply-To: <20161029211647.GA25740@gofer.mess.org> Content-Type: text/plain; charset="windows-1252"; format=flowed Content-Transfer-Encoding: 7bit X-Originating-IP: [134.15.1.64] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 10/29/2016 04:16 PM, Sean Young wrote: > On Fri, Oct 28, 2016 at 02:42:25PM -0500, Nathan Zimmer wrote: >> On Thu, Oct 27, 2016 at 09:19:16PM +0100, Sean Young wrote: >>> On Wed, Oct 26, 2016 at 01:16:16PM -0500, Nathan Zimmer wrote: >>>> On 10/25/2016 03:41 PM, Sean Young wrote: >>>>> On Mon, Oct 24, 2016 at 04:49:25PM -0500, Nathan Zimmer wrote: >>>>>> [ 1.565062] serial8250: ttyS1 at I/O 0x2f8 (irq = 3) is a 16550A >>>>> The isa probe driver find the serial port. >>>>> >>>>>> [ 1.566453] serial 00:04: pnp_assign_resources, try dependent set 0 >>>>>> [ 1.567383] serial 00:04: couldn't assign io 0 (min 0x2f8 max 0x2f8) >>>>> But then decides that the port is already in use (the existing serial driver). >>>>>> [ 1.568366] serial 00:04: pnp_assign_resources failed (-16) >>>>>> [ 1.569188] serial 00:04: unable to assign resources >>>>>> [ 1.569924] serial: probe of 00:04 failed with error -16 >>>>> Please try and boot 3.7.0 with "8250.share_irqs=1", maybe it will pick >>>>> irq 3 and it will be happy again, but that is just a guess. >>>>> >>>>> I think I have not fully understood what the failure is. Does the serial >>>>> port not work or does the boot hang? What are the symptoms? >>>> With console=ttyS1 the boot will "hang", sometimes it makes it all the way >>>> through but may take 30 minutes, instead of the 2-4 minutes this box >>> Where does it hang? Any error messages? >>> >> Shortly after mounting the root. >> After that I get no more output... >> >> Here is a failure log from 4.8. > So does the console on the serial port work on 4.8? Also what does > "cat /proc/interrupts" say with and without my change of ordering the > serial pnp probe before the isa probe? > > It could be that the serial driver picking a different irq caused another > driver to be forced to pick another irq which does not work. > > > Sean Works is a strong word. It produces output until it hangs in boot. It certainly could be another driver but I don't see another irq12 in the dmesg log. I'll grab some data once I back in the office tomorrow. Nate