From mboxrd@z Thu Jan  1 00:00:00 1970
From: Eddie Huang <eddie.huang@mediatek.com>
Subject: Re: [PATCH v2 1/4] tty: serial: Add 8250 earlycon to support
 noinit option
Date: Tue, 13 Jan 2015 09:05:29 +0800
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To: Arnd Bergmann <arnd@arndb.de>, Alan Cox <alan@linux.intel.com>
Cc: Mark Rutland <mark.rutland@arm.com>, linux-doc@vger.kernel.org, Catalin Marinas <catalin.marinas@arm.com>, Will Deacon <will.deacon@arm.com>, Jiri Slaby <jslaby@suse.cz>, Jonathan Corbet <corbet@lwn.net>, yh.chen@mediatek.com, Howard Chen <ibanezchen@gmail.com>, linux-serial@vger.kernel.org, "Joe.C" <yingjoe.chen@mediatek.com>, devicetree@vger.kernel.org, Vladimir Murzin <vladimir.murzin@arm.com>, Pawel Moll <pawel.moll@arm.com>, Ian Campbell <ijc+devicetree@hellion.org.uk>, Rob Herring <robh+dt@kernel.org>, Matthias Brugger <matthias.bgg@gmail.com>, linux-arm-kernel@lists.infradead.org, srv_heupstream@mediatek.com, Greg Kroah-Hartman <gregkh@linuxfoundation.org>, linux-kernel@vger.kernel.org, Ashwin Chaugule <ashwin.chaugule@linaro.org>, Kumar Gala <galak@codeaurora.org>
List-Id: devicetree@vger.kernel.org

Hi Arnd,

On Mon, 2015-01-12 at 16:08 +0000, Alan Cox wrote:
> On Mon, 2015-01-12 at 16:35 +0100, Arnd Bergmann wrote:
> > On Monday 12 January 2015 21:08:21 Eddie Huang wrote:
> > > Add earlycon support not only baudrate option, but also add noinit option.
> > > If use noinit option, 8250 earlycon will not init serial hardware and use
> > > loader setting.
> > > 
> > > Signed-off-by: Eddie Huang <eddie.huang@mediatek.com>
> > 
> > I probably missed something in the previous discussion, but why is
> > "noinit" not just the default? I believe that is how we handle early
> > serial ports on PowerPC, and I see no downsides to it.
> 
> Most PC hardware at least needs the port initialised to use it. It won't
> have been configured by the firmware in many cases.
> 

Sorry no continue discuss in previous series. Since other 8250 user may
already depend on current init behavior, I think it's better to keep it
and add noinit by extra setting.

Eddie