linux-kernel - Re: [RFC 0/5] console/acpi: add DBG2 and SPCR console configuration

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Message-ID: <20150923154535.GB2431@xora-yoga13-vm.xora.org.uk>
Date:	Wed, 23 Sep 2015 16:45:35 +0100
From:	G Gregory <graeme.gregory@...aro.org>
To:	Ming Lei <ming.lei@...onical.com>
Cc:	Leif Lindholm <leif.lindholm@...aro.org>,
	linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	linux-serial@...r.kernel.org,
	Linux ACPI <linux-acpi@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Mark Rutland <mark.rutland@....com>, al.stone@...aro.org,
	torez@...hat.com, Jon Masters <jcm@...hat.com>,
	linaro-acpi@...ts.linaro.org, Lv Zheng <lv.zheng@...el.com>
Subject: Re: [RFC 0/5] console/acpi: add DBG2 and SPCR console configuration

On Wed, Sep 23, 2015 at 03:38:20PM +0800, Ming Lei wrote:
> Hi Leif,
> 
> 
> On Tue, Sep 8, 2015 at 8:43 PM, Leif Lindholm <leif.lindholm@...aro.org> wrote:
> > Support for configuring bootconsole and console via the ACPI tables
> > DBG2 (Debug Port Table 2) [1] and SPCR (Serial Port Console Redirection
> > Table) [2], defined by Microsoft, has been discussed on and off over the
> > years.
> >
> > [1] https://msdn.microsoft.com/en-us/library/windows/hardware/dn639131(v=vs.85).aspx
> > [2] https://msdn.microsoft.com/en-us/library/windows/hardware/dn639132(v=vs.85).aspx
> >
> > Licensing concerns have prevented this happening in the past, but as of
> > 10 August 2015, these tables have both been released also under OWF 1.0
> > (http://www.openwebfoundation.org/legal/the-owf-1-0-agreements/owfa-1-0)
> > which is think is noncontroversially GPL-compatible?
> >
> > This set is a first attempt at implementing this.
> 
> From distribution view, the patchset looks very useful.
> 
> I have one simple question, are there other candidates for conveying this kind
> of information like what DBG2/SPCR does? Or are DBG2 and SPCR the
> offical speficiations to do such things in ARM server industry?
> 

They are mandated in the SBBR spec

Graeme


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