From mboxrd@z Thu Jan  1 00:00:00 1970
From: alan@linux.intel.com (Alan Cox)
Date: Mon, 12 Jan 2015 16:08:38 +0000
Subject: [PATCH v2 1/4] tty: serial: Add 8250 earlycon to support noinit
 option
In-Reply-To: <3712986.8SuKNvhKTk@wuerfel>
References: <1421068104-30463-1-git-send-email-eddie.huang@mediatek.com>
 <1421068104-30463-2-git-send-email-eddie.huang@mediatek.com>
 <3712986.8SuKNvhKTk@wuerfel>
Message-ID: <1421078918.31978.32.camel@linux.intel.com>
To: linux-arm-kernel@lists.infradead.org
List-Id: linux-arm-kernel.lists.infradead.org

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.

Alan