linux-kernel - Re: [PATCH 2/4] ARC: [axs101] support early 8250 uart

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Date:	Thu, 14 May 2015 13:04:27 +0000
From:	Vineet Gupta <Vineet.Gupta1@...opsys.com>
To:	Arnd Bergmann <arnd@...db.de>,
	Alexey Brodkin <Alexey.Brodkin@...opsys.com>
CC:	"linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"arc-linux-dev@...opsys.com" <arc-linux-dev@...opsys.com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Rob Herring <rob.herring@...xeda.com>,
	Peter Hurley <peter@...leysoftware.com>
Subject: Re: [PATCH 2/4] ARC: [axs101] support early 8250 uart

On Thursday 14 May 2015 06:23 PM, Arnd Bergmann wrote:

On Thursday 14 May 2015 15:48:42 Alexey Brodkin wrote:


>
>         chosen {
> -               bootargs = "console=tty0 console=ttyS3,115200n8 consoleblank=0";
> +               bootargs = "earlycon=uart8250,mmio32,0xe0022000,115200n8 console=tty0 console=ttyS3,115200n8 consoleblank=0";
>         };
>  };
>


When you do earlycon with DT, better use a 'stdout-path' property that points
to the device, and just put 'earlycon' without arguments on the command line.

        Arnd


Sure ! I tried that once (3.16) and even the dts patch got merged but had to be reverted out !

2014-07-27 22524b02b17b Revert "ARC: [arcfpga] stdout-path now suffices for earlycon/console"

Let me see if that works again since serial land has seen some significant churn in recent times

Thx for pointing this out !

-Vineet
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