linux-kernel - Re: [PATCH 2/2] ARM: dts: sun8i: enable UART1 for iNet D978 Rev2 board

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Message-ID: <20160825204726.GH32598@lukather>
Date:   Thu, 25 Aug 2016 22:47:26 +0200
From:   Maxime Ripard <maxime.ripard@...e-electrons.com>
To:     Icenowy Zheng <icenowy@...c.xyz>
Cc:     Chen-Yu Tsai <wens@...e.org>, Russell King <linux@...linux.org.uk>,
        Hans de Goede <hdegoede@...hat.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/2] ARM: dts: sun8i: enable UART1 for iNet D978 Rev2
 board

On Thu, Aug 25, 2016 at 10:12:35PM +0800, Icenowy Zheng wrote:
> >>  But many codes will require a ttyS0 as console... So I think the
> >>  bluetooth should be located at ttyS1...
> >
> > Most of them would use /dev/console anyway. What do you have in mind?
> 
> As a general configuration, /dev/ttyS0 will be indicated as the default console=
> value... (Otherwise more boards will fail)

There's no reason to make that assumption. The console might be on
another UART entirely (ttyS3, for the sake of the argument), on a
different UART "class" (ttyUSB?, framebuffer console?), or not present
at all.

If you want to use the console, use /dev/console.

I don't what's so special about the UART here. Every single device in
Linux behaves that way.

Maxime

-- 
Maxime Ripard, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com

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