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

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Message-ID: <508883D6.70706@wwwdotorg.org>
Date:	Wed, 24 Oct 2012 18:12:06 -0600
From:	Stephen Warren <swarren@...dotorg.org>
To:	Joe Perches <joe@...ches.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 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.
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