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

[Hanjun Guo]

Hi Graeme,

On 2015å01æ02æ 04:04, Graeme Gregory wrote:
> On Wed, Dec 31, 2014 at 04:34:46PM +0800, Hanjun Guo wrote:
> > On 2014å12æ31æ 04:13, ashwinc@xxxxxxxxxxxxxx wrote:
> > > Hi Hanjun,
> > >
> > > Overall the document looks good to us. Some minor clarifications below.
> > >
> > > > ---------- Forwarded message ----------
> > > > From: Graeme Gregory <graeme.gregory@xxxxxxxxxx>
> > > >
> > > > Add documentation for the guidelines of how to use ACPI
> > > > on ARM64.
> > > >
> > > > Signed-off-by: Graeme Gregory <graeme.gregory@xxxxxxxxxx>
> > > > Signed-off-by: Al Stone <al.stone@xxxxxxxxxx>
> > > > Signed-off-by: Hanjun Guo <hanjun.guo@xxxxxxxxxx>
> > > > ---
> > > >   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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