From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751633AbbABJ2g (ORCPT ); Fri, 2 Jan 2015 04:28:36 -0500 Received: from mail-pa0-f47.google.com ([209.85.220.47]:59189 "EHLO mail-pa0-f47.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751067AbbABJ2W (ORCPT ); Fri, 2 Jan 2015 04:28:22 -0500 Message-ID: <54A664AB.3030101@linaro.org> Date: Fri, 02 Jan 2015 17:28:11 +0800 From: Hanjun Guo User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.3.0 MIME-Version: 1.0 To: Graeme Gregory CC: ashwinc@codeaurora.org, catalin.marinas@arm.com, rjw@rjwysocki.net, mark.rutland@arm.com, olof@lixom.net, grant.likely@linaro.org, will.deacon@arm.com, linaro-acpi@lists.linaro.org, Liviu.Dudau@arm.com, lv.zheng@intel.com, robh@kernel.org, Lorenzo.Pieralisi@arm.com, al.stone@linaro.org, daniel.lezcano@linaro.org, robert.moore@intel.com, linux-acpi@vger.kernel.org, Charles.Garcia-Tobin@arm.com, rric@kernel.org, jason@lakedaemon.net, arnd@arndb.de, marc.zyngier@arm.com, jcm@redhat.com, broonie@kernel.org, "bhelgaas@google.com." , graeme.gregory@linaro.org, Kangkang.Shen@huawei.com, rdunlap@infradead.org, linux-kernel@vger.kernel.org, Sudeep.Holla@arm.com Subject: Re: [PATCH v5 18/18] Documentation: ACPI for ARM64 References: <1413553034-20956-1-git-send-email-hanjun.guo@linaro.org> <1413553034-20956-19-git-send-email-hanjun.guo@linaro.org> <8fc9550c96a468b3e50d51a37db68a33.squirrel@www.codeaurora.org> <54A3B526.9040903@linaro.org> <20150101200424.GB12770@xora-haswell.xora.org.uk> In-Reply-To: <20150101200424.GB12770@xora-haswell.xora.org.uk> Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Graeme, On 2015年01月02日 04:04, Graeme Gregory wrote: > On Wed, Dec 31, 2014 at 04:34:46PM +0800, Hanjun Guo wrote: >> On 2014年12月31日 04:13, ashwinc@codeaurora.org wrote: >>> Hi Hanjun, >>> >>> Overall the document looks good to us. Some minor clarifications below. >>> >>>> ---------- Forwarded message ---------- >>>> From: Graeme Gregory >>>> >>>> Add documentation for the guidelines of how to use ACPI >>>> on ARM64. >>>> >>>> Signed-off-by: Graeme Gregory >>>> Signed-off-by: Al Stone >>>> Signed-off-by: Hanjun Guo >>>> --- >>>> Documentation/arm64/arm-acpi.txt | 323 >>>> ++++++++++++++++++++++++++++++++++++++ >>>> 1 file changed, 323 insertions(+) >>>> create mode 100644 Documentation/arm64/arm-acpi.txt >>>> >>> >>> [..] >>> >>>> +Relationship with Device Tree >>>> +----------------------------- >>> >>> [..] >>> >>>> +When booting using ACPI tables, the /chosen node in DT will still be >>>> parsed >>>> +to extract the kernel command line and initrd path. No other section of >>>> the >>>> +DT will be used. >>> >>> Is this still true? >> >> No, we can booting the ACPI system in EFI stub without dtb. Catalin >> also pointed out this issue, I will remove this paragraph. >> > > The paragraph is still correct, the /chosen node is always present even > if nothing else is. Sorry for the confusing, I mean no dtb needed for the command line if ACPI tables are available. efi will create a empty dtb if no dtb found, and add the cmd line into the new created dtb, I'm just wondering, can we remove the limitation for passing the cmd line in /chosen node in the future? Thanks Hanjun