From mboxrd@z Thu Jan  1 00:00:00 1970
From: eddie.huang@mediatek.com (Eddie Huang)
Date: Tue, 13 Jan 2015 09:05:29 +0800
Subject: [PATCH v2 1/4] tty: serial: Add 8250 earlycon to support
 noinit option
In-Reply-To: <1421078918.31978.32.camel@linux.intel.com>
References: <1421068104-30463-1-git-send-email-eddie.huang@mediatek.com>
 <1421068104-30463-2-git-send-email-eddie.huang@mediatek.com>
 <3712986.8SuKNvhKTk@wuerfel>  <1421078918.31978.32.camel@linux.intel.com>
Message-ID: <1421111129.10374.4.camel@mtksdaap41>
To: linux-arm-kernel@lists.infradead.org
List-Id: linux-arm-kernel.lists.infradead.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