From: Alan Cox <alan@linux.intel.com>
To: Arnd Bergmann <arnd@arndb.de>
Cc: linux-arm-kernel@lists.infradead.org,
Eddie Huang <eddie.huang@mediatek.com>,
Rob Herring <robh+dt@kernel.org>,
Mark Rutland <mark.rutland@arm.com>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Matthias Brugger <matthias.bgg@gmail.com>,
devicetree@vger.kernel.org,
Vladimir Murzin <vladimir.murzin@arm.com>,
srv_heupstream@mediatek.com, Pawel Moll <pawel.moll@arm.com>,
Ian Campbell <ijc+devicetree@hellion.org.uk>,
Catalin Marinas <catalin.marinas@arm.com>,
Jonathan Corbet <corbet@lwn.net>,
Will Deacon <will.deacon@arm.com>,
linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org,
yh.chen@mediatek.com, Howard Chen <ibanezchen@gmail.com>,
Ashwin Chaugule <ashwin.chaugule@linaro.org>,
linux-serial@vger.kernel.org, Kumar Gala <galak@codeaurora.org>,
"Joe.C" <yingjoe.chen@mediatek.com>, Jiri Slaby <jslaby@suse.cz>
Subject: Re: [PATCH v2 1/4] tty: serial: Add 8250 earlycon to support noinit option
Date: Mon, 12 Jan 2015 16:08:38 +0000 [thread overview]
Message-ID: <1421078918.31978.32.camel@linux.intel.com> (raw)
In-Reply-To: <3712986.8SuKNvhKTk@wuerfel>
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
WARNING: multiple messages have this Message-ID (diff)
From: alan@linux.intel.com (Alan Cox)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH v2 1/4] tty: serial: Add 8250 earlycon to support noinit option
Date: Mon, 12 Jan 2015 16:08:38 +0000 [thread overview]
Message-ID: <1421078918.31978.32.camel@linux.intel.com> (raw)
In-Reply-To: <3712986.8SuKNvhKTk@wuerfel>
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
next prev parent reply other threads:[~2015-01-12 16:09 UTC|newest]
Thread overview: 43+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-01-12 13:08 [PATCH v2 0/4] tty: serial: Add earlycon support to MT8173 SoC Eddie Huang
2015-01-12 13:08 ` Eddie Huang
2015-01-12 13:08 ` [PATCH v2 1/4] tty: serial: Add 8250 earlycon to support noinit option Eddie Huang
2015-01-12 13:08 ` Eddie Huang
2015-01-12 15:35 ` Arnd Bergmann
2015-01-12 15:35 ` Arnd Bergmann
2015-01-12 16:08 ` Alan Cox [this message]
2015-01-12 16:08 ` Alan Cox
2015-01-13 1:05 ` Eddie Huang
2015-01-13 1:05 ` Eddie Huang
2015-02-01 16:27 ` Peter Hurley
2015-02-01 16:27 ` Peter Hurley
2015-02-01 16:27 ` Peter Hurley
2015-02-01 18:26 ` Peter Hurley
2015-02-01 18:26 ` Peter Hurley
2015-02-01 18:26 ` Peter Hurley
2015-02-02 3:16 ` Eddie Huang
2015-02-02 3:16 ` Eddie Huang
2015-02-02 3:45 ` Peter Hurley
2015-02-02 3:45 ` Peter Hurley
2015-02-02 4:28 ` Greg Kroah-Hartman
2015-02-02 4:28 ` Greg Kroah-Hartman
2015-02-02 5:15 ` Peter Hurley
2015-02-02 5:15 ` Peter Hurley
2015-02-02 5:24 ` Greg Kroah-Hartman
2015-02-02 5:24 ` Greg Kroah-Hartman
2015-02-02 5:33 ` Eddie Huang
2015-02-02 5:33 ` Eddie Huang
2015-02-02 5:43 ` Peter Hurley
2015-02-02 5:43 ` Peter Hurley
2015-02-02 5:43 ` Peter Hurley
2015-02-02 18:46 ` Greg Kroah-Hartman
2015-02-02 18:46 ` Greg Kroah-Hartman
2015-02-02 2:45 ` Eddie Huang
2015-02-02 2:45 ` Eddie Huang
2015-02-02 3:27 ` Peter Hurley
2015-02-02 3:27 ` Peter Hurley
2015-01-12 13:08 ` [PATCH v2 2/4] tty: serial: 8250_mtk: Add earlycon Eddie Huang
2015-01-12 13:08 ` Eddie Huang
2015-01-12 13:08 ` [PATCH v2 3/4] arm64: dts: Add mediatek MT8173 earlycon support Eddie Huang
2015-01-12 13:08 ` Eddie Huang
2015-01-12 13:08 ` [PATCH v2 4/4] Document: Modify 8250 earlycon kernel parameters Eddie Huang
2015-01-12 13:08 ` Eddie Huang
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