linux-kernel - Re: [PATCH v5 18/18] Documentation: ACPI for ARM64

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Message-ID: <54A664AB.3030101@linaro.org>
Date:	Fri, 02 Jan 2015 17:28:11 +0800
From:	Hanjun Guo <hanjun.guo@...aro.org>
To:	Graeme Gregory <gg@...mlogic.co.uk>
CC:	ashwinc@...eaurora.org, catalin.marinas@....com, rjw@...ysocki.net,
	mark.rutland@....com, olof@...om.net, grant.likely@...aro.org,
	will.deacon@....com, linaro-acpi@...ts.linaro.org,
	Liviu.Dudau@....com, lv.zheng@...el.com, robh@...nel.org,
	Lorenzo.Pieralisi@....com, al.stone@...aro.org,
	daniel.lezcano@...aro.org, robert.moore@...el.com,
	linux-acpi@...r.kernel.org, Charles.Garcia-Tobin@....com,
	rric@...nel.org, jason@...edaemon.net, arnd@...db.de,
	marc.zyngier@....com, jcm@...hat.com, broonie@...nel.org,
	"bhelgaas@...gle.com." <linux-arm-kernel@...ts.infradead.org>,
	graeme.gregory@...aro.org, Kangkang.Shen@...wei.com,
	rdunlap@...radead.org, linux-kernel@...r.kernel.org,
	Sudeep.Holla@....com
Subject: Re: [PATCH v5 18/18] Documentation: ACPI for ARM64

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@...eaurora.org wrote:
>>> Hi Hanjun,
>>>
>>> Overall the document looks good to us. Some minor clarifications below.
>>>
>>>> ---------- Forwarded message ----------
>>>> From: Graeme Gregory <graeme.gregory@...aro.org>
>>>>
>>>> Add documentation for the guidelines of how to use ACPI
>>>> on ARM64.
>>>>
>>>> Signed-off-by: Graeme Gregory <graeme.gregory@...aro.org>
>>>> Signed-off-by: Al Stone <al.stone@...aro.org>
>>>> Signed-off-by: Hanjun Guo <hanjun.guo@...aro.org>
>>>> ---
>>>>   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
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