Hi Graeme,

On 2015?01?02? 04:04, Graeme Gregory wrote:

On Wed, Dec 31, 2014 at 04:34:46PM +0800, Hanjun Guo wrote:

quoted

On 2014?12?31? 04:13, ashwinc at codeaurora.org wrote:

quoted

Hi Hanjun,

Overall the document looks good to us. Some minor clarifications below.

quoted

---------- Forwarded message ----------
From: Graeme Gregory <redacted>

Add documentation for the guidelines of how to use ACPI
on ARM64.

Signed-off-by: Graeme Gregory <redacted>
Signed-off-by: Al Stone <redacted>
Signed-off-by: Hanjun Guo <redacted>
---
  Documentation/arm64/arm-acpi.txt |  323
++++++++++++++++++++++++++++++++++++++
  1 file changed, 323 insertions(+)
  create mode 100644 Documentation/arm64/arm-acpi.txt

[..]

quoted

+Relationship with Device Tree
+-----------------------------

[..]

quoted

+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