linux-kernel - Re: [PATCH v3 3/3] of: support passing console options with stdout-path

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Message-ID: <20150226134646.GB8806@lunn.ch>
Date:	Thu, 26 Feb 2015 14:46:46 +0100
From:	Andrew Lunn <andrew@...n.ch>
To:	Peter Hurley <peter@...leysoftware.com>
Cc:	Leif Lindholm <leif.lindholm@...aro.org>, grant.likely@...aro.org,
	devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org, mark.rutland@....com,
	robh+dt@...nel.org, plagnioj@...osoft.com, ijc@...ian.org,
	s.hauer@...gutronix.de
Subject: Re: [PATCH v3 3/3] of: support passing console options with
 stdout-path

On Thu, Feb 26, 2015 at 06:55:22AM -0500, Peter Hurley wrote:
> On 11/27/2014 12:56 PM, Leif Lindholm wrote:
> > Support specifying console options (like with console=ttyXN,<options>)
> > by appending them to the stdout-path property after a separating ':'.
> > 
> > Example:
> >         stdout-path = "uart0:115200";
> 
> This format breaks DT earlycon because libfdt doesn't recognize ':' as a
> path terminator.
> 
> It's simple enough to fix this directly in early_init_dt_scan_chosen_serial()
> but perhaps it would better to teach fdt_path_offset() to recognize ':'?

Hi Peter

ePAPR says for stdout-path in Chosen:

A string that specifies the full path to the node representing the
device to be used for boot console output. If the character ":" is
present in the value it terminates the path. The value may be an
alias.

So it is probably wise to implement this properly.

   Andrew
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