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

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Date:   Tue, 18 Oct 2016 11:40:04 -0500
From:   Nathan Zimmer <nzimmer@....com>
To:     Nathan Zimmer <nzimmer@....com>
Cc:     Sean Young <sean@...s.org>, linux-kernel@...r.kernel.org,
        linux-serial@...r.kernel.org, gregkh@...uxfoundation.org,
        alan@...ux.intel.com
Subject: Re: console issue since 3.6, console=ttyS1 hangs

3.7.0
cat /sys/bus/pnp/drivers/serial/*/resources
state = active
io 0x2f8-0x2ff
irq 12
dma disabled

3.6.0
:~ # cat /sys/bus/pnp/drivers/serial/*/resources
cat: /sys/bus/pnp/drivers/serial/*/resources: No such file or directory

Which is intresting.
So I thought tacking on "tail /sys/devices/pnp0/*/resources" might be helpful.



On Mon, Oct 17, 2016 at 11:41:40AM -0500, Nathan Zimmer wrote:
> Ok I'll get that sometime tomorrow.  Right now they pulled it down maintenance...
> 
> On Mon, Oct 17, 2016 at 04:19:07PM +0100, Sean Young wrote:
> > On Mon, Oct 17, 2016 at 09:49:51AM -0500, Nathan Zimmer wrote:
> > > A cluster client recently tried to update from Sles11 to Sles12 and found in
> > > some cases the boxes would hang in early boot.  It came down to console=ttyS1
> > > on the command line.  After a bisection I found it happended in here:
> > > 
> > > commit 835d844d1a28efba81d5aca7385e24c29d3a6db2
> > > Author: Sean Young <sean@...s.org>
> > > Date:   Fri Sep 7 19:06:23 2012 +0100
> > > 
> > >     8250_pnp: do pnp probe before legacy probe
> > > 
> > > 
> > > I found I can revert the part of the patch in 8250.c (now 8250_core.c) and
> > > the hangs do not happen.
> > > 
> > > Bios of the offending box ( I don't know if there a bios update )
> > > Version 2.15.1234. Copyright (C) 2012 American Megatrends, Inc.
> > > BIOS Date: 02/05/2014 13:45:09
> > > Ver: ma2e2054.16I
> > > 
> > > I don't have much more info but will collect anything that is asked.
> > > Any help would be appeciated.
> > 
> > The console output would be helpful (both before 3.6 and with 3.6). It 
> > could be that what the bios provides in pnp does not match the actual
> > config.
> > 
> > The output of:
> > 
> > cat /sys/bus/pnp/drivers/serial/*/resources
> > 
> > Would be helpful, thanks.
> > 
> > 
> > Sean

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