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

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Message-ID: <CACVXFVPEJb-RXLgU0V+HduoENquUs3oDGWsUtCvH+TOSRMYiUg@mail.gmail.com>
Date:	Wed, 23 Sep 2015 15:38:20 +0800
From:	Ming Lei <ming.lei@...onical.com>
To:	Leif Lindholm <leif.lindholm@...aro.org>
Cc:	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>,
	G Gregory <graeme.gregory@...aro.org>,
	linaro-acpi@...ts.linaro.org, Lv Zheng <lv.zheng@...el.com>
Subject: Re: [RFC 0/5] console/acpi: add DBG2 and SPCR console configuration

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?

Thanks,
--
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