linux-kernel - Re: [PATCH 03/23] printk: Move braille console support into separate braille.[ch] files

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Date:	Wed, 24 Oct 2012 17:31:24 -0700
From:	Joe Perches <joe@...ches.com>
To:	Stephen Warren <swarren@...dotorg.org>,
	Ming Lei <tom.leiming@...il.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, Kay Sievers <kay@...y.org>,
	Samuel Thibault <samuel.thibault@...-lyon.org>
Subject: Re: [PATCH 03/23] printk: Move braille console support into
 separate braille.[ch] files

On Wed, 2012-10-24 at 18:12 -0600, Stephen Warren wrote:
> On 10/17/2012 12:06 AM, Joe Perches wrote:
> > Create files with prototypes and static inlines for braille
> > support.  Make braille_console functions return 1 on success.
> 
> Joe,
> 
> Between next-20121022 and next-20121023, the serial console (on the ARM
> SoC Tegra at least) stopped working. The issue bisects down to this
> commit. I haven't had a chance to investigate why yet, I just finished
> bisected.
> 
> earlyprintk over the same UART works. Once the system has booted, a few
> late kernel messages do appear, and then getty/login over the UART
> works. So, it's just the printk messages that disappeared.
> 
> In case it's relevant, my command-line is:
> 
> console=ttyS0,115200n8 loglevel=8 rootwait rw earlyprintk
> root=PARTUUID=b2f82cda-2535-4779-b467-094a210fbae7
> 
> I'll continue to investigate further tomorrow, but just wanted to give
> you a heads-up in case you could immediately see anything obvious in the
> code.

Hi Stephen.

Thanks, I appreciate the heads-up.  This should be solved
by Ming Lei's patch (which I've incorporated into a V2
series I will post shortly).

https://lkml.org/lkml/2012/10/23/307


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