linux-kernel - Re: [PATCH v2 1/4] tty: serial: Add 8250 earlycon to support noinit option

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Message-ID: <1421078918.31978.32.camel@linux.intel.com>
Date:	Mon, 12 Jan 2015 16:08:38 +0000
From:	Alan Cox <alan@...ux.intel.com>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	linux-arm-kernel@...ts.infradead.org,
	Eddie Huang <eddie.huang@...iatek.com>,
	Rob Herring <robh+dt@...nel.org>,
	Mark Rutland <mark.rutland@....com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Matthias Brugger <matthias.bgg@...il.com>,
	devicetree@...r.kernel.org,
	Vladimir Murzin <vladimir.murzin@....com>,
	srv_heupstream@...iatek.com, Pawel Moll <pawel.moll@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Catalin Marinas <catalin.marinas@....com>,
	Jonathan Corbet <corbet@....net>,
	Will Deacon <will.deacon@....com>,
	linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org,
	yh.chen@...iatek.com, Howard Chen <ibanezchen@...il.com>,
	Ashwin Chaugule <ashwin.chaugule@...aro.org>,
	linux-serial@...r.kernel.org, Kumar Gala <galak@...eaurora.org>,
	"Joe.C" <yingjoe.chen@...iatek.com>, Jiri Slaby <jslaby@...e.cz>
Subject: Re: [PATCH v2 1/4] tty: serial: Add 8250 earlycon to support noinit
 option

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@...iatek.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


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