From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752260AbbIWHi0 (ORCPT ); Wed, 23 Sep 2015 03:38:26 -0400 Received: from youngberry.canonical.com ([91.189.89.112]:49288 "EHLO youngberry.canonical.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751110AbbIWHiX (ORCPT ); Wed, 23 Sep 2015 03:38:23 -0400 MIME-Version: 1.0 In-Reply-To: <1441716217-23786-1-git-send-email-leif.lindholm@linaro.org> References: <1441716217-23786-1-git-send-email-leif.lindholm@linaro.org> Date: Wed, 23 Sep 2015 15:38:20 +0800 Message-ID: Subject: Re: [RFC 0/5] console/acpi: add DBG2 and SPCR console configuration From: Ming Lei To: Leif Lindholm Cc: linux-arm-kernel , "devicetree@vger.kernel.org" , linux-serial@vger.kernel.org, Linux ACPI , Linux Kernel Mailing List , Mark Rutland , al.stone@linaro.org, torez@redhat.com, Jon Masters , G Gregory , linaro-acpi@lists.linaro.org, Lv Zheng Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Leif, On Tue, Sep 8, 2015 at 8:43 PM, Leif Lindholm 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,