linux-kernel - Re: SPCR table parsing

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Message-ID: <20150116105804.GF21809@leverpostej>
Date:	Fri, 16 Jan 2015 10:58:04 +0000
From:	Mark Rutland <mark.rutland@....com>
To:	Jon Masters <jcm@...hat.com>
Cc:	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>, leif.lindholm@...aro.org
Subject: Re: SPCR table parsing

On Fri, Jan 16, 2015 at 03:08:37AM +0000, Jon Masters wrote:
> Hi Folks,
> 
> We're implementing support for SPCR table parsing shortly[0], since it
> will allow to deprecate supplying a "console=" (and eventually, also
> "earlycon=") on 64-bit ARM servers, where it's not always the case that
> we can assume a 16550 at a specific address. SPCR has been provided on
> x86 systems since 2000 but is not (yet) supported by Linux.

For anyone using DT rather than ACPI, the same can be achieved in
mainline with /chosen/stdout-path as of:

7914a7c5651a5161 "of: support passing console options with stdout-path"

Documented in:

2a9d832cc9aae21e "of: Add bindings for chosen node, stdout-path"

e.g.

uart: serial@f00 {
	reg = <0xf00 0x200>;
	compatible = "vendor,some-serial-device";
};

chosen {
	stdout-path = "/serial@f00:115200n8";
};

This will be used for both the console and earlycon. Please make use of
this where possible.

Thanks,
Mark.
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