linux-kernel - Re: [PATCH v2 3/7] tty/serial: convert 8250 to generic earlycon

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Date:	Mon, 9 Jun 2014 15:25:37 -0700
From:	Tony Luck <tony.luck@...il.com>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:	Rob Herring <robherring2@...il.com>,
	Yinghai Lu <yinghai@...nel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"linux-serial@...r.kernel.org" <linux-serial@...r.kernel.org>,
	Jiri Slaby <jslaby@...e.cz>,
	Catalin Marinas <catalin.marinas@....com>,
	Russell King <linux@....linux.org.uk>,
	Will Deacon <will.deacon@....com>,
	Arnd Bergmann <arnd@...db.de>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH v2 3/7] tty/serial: convert 8250 to generic earlycon

On Sat, May 3, 2014 at 3:16 PM, Greg Kroah-Hartman
<gregkh@...uxfoundation.org> wrote:
>> > >>  drivers/tty/serial/8250/8250_early.c | 138 ++++-------------------------------
>> > >>  drivers/tty/serial/8250/Kconfig      |   1 +
>> > >>  2 files changed, 16 insertions(+), 123 deletions(-)
>> > >
>> > > Hi Greg, Rob
>> > >
>> > > This one in tty-next breaks booting: "console=uart8250,io,0x3f8,115200".
>> > > No early console and regular console anymore.
>> > >
>> > > It should produce "early con and regular con".
>> >
>> > This is what I get for running checkpatch and converting
>> > simple_strtoul to kstrto* which are not so equivalent. kstrto* will
>> > not convert things such as 115200n8 to a number.
>> >
>> > Greg, Do you want a fix or for me to respin the series? The fix looks like this:
>>
>> As this is in my tree now (right?), I need a fix to apply to it.
>
> Nevermind, you already sent it...

Linus' tree (HEAD=963649d735c8) is spitting out all sorts of garbage
on the serial console - as if the baud rate is being periodically set
to something weird, and then back to 112500.  I see over a dozen
blocks of junk interspersed with good output.

This in on ia64 with "console=uart,io,0x3f8" on the command line.

git bisect pointed me here:

d2fd6810a823bcde1ee232668f5689837aafa772 is first bad commit
commit d2fd6810a823bcde1ee232668f5689837aafa772
Author: Rob Herring <robh@...nel.org>
Date:   Fri Apr 18 17:19:56 2014 -0500

    tty/serial: convert 8250 to generic earlycon

-Tony
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