From mboxrd@z Thu Jan 1 00:00:00 1970 From: Shawn Guo Subject: Re: [PATCH] ARM: dts: vf-colibri: define stdout-path property Date: Fri, 17 Jul 2015 10:55:53 +0800 Message-ID: <20150717025553.GA12927@tiger> References: <1435910799-11706-1-git-send-email-stefan@agner.ch> <20150713151004.GA26642@tiger> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline In-Reply-To: Sender: linux-kernel-owner@vger.kernel.org To: Stefan Agner Cc: devicetree@vger.kernel.org, shawn.guo@linaro.org, linux-arm-kernel@lists.infradead.org, kernel@pengutronix.de, linux-kernel@vger.kernel.org List-Id: devicetree@vger.kernel.org On Wed, Jul 15, 2015 at 04:05:50PM +0200, Stefan Agner wrote: > On 2015-07-13 17:10, Shawn Guo wrote: > > On Fri, Jul 03, 2015 at 10:06:39AM +0200, Stefan Agner wrote: > >> Define Vybrid's UART0, connected to the Colibri pinout UART_A, as > >> standard output. > >> > >> Signed-off-by: Stefan Agner > >> --- > >> arch/arm/boot/dts/vf-colibri-eval-v3.dtsi | 1 + > >> 1 file changed, 1 insertion(+) > >> > >> diff --git a/arch/arm/boot/dts/vf-colibri-eval-v3.dtsi b/arch/arm/boot/dts/vf-colibri-eval-v3.dtsi > >> index 2cbe663..cb199ae 100644 > >> --- a/arch/arm/boot/dts/vf-colibri-eval-v3.dtsi > >> +++ b/arch/arm/boot/dts/vf-colibri-eval-v3.dtsi > >> @@ -10,6 +10,7 @@ > >> / { > >> chosen { > >> bootargs = "console=ttyLP0,115200"; > >> + stdout-path = "serial0:115200n8"; > > > > With this change, can bootargs just be dropped? > > I guess it would break a (fairly old) kernel which does not support > stdout-path yet? The DT ABI requires that the new kernel doesn't break anything with old DTB, but doesn't require the compatibility between new DTB and old kernel. Shawn