On 2015/2/25 16:40, Hanjun Guo wrote: > From: Graeme Gregory <graeme.gregory@xxxxxxxxxx> > > Add documentation for the guidelines of how to use ACPI > on ARM64. > > Reviewed-by: Suravee Suthikulpanit <Suravee.Suthikulpanit@xxxxxxx> > Reviewed-by: Yi Li <phoenix.liyi@xxxxxxxxxx> > Reviewed-by: Mark Langsdorf <mlangsdo@xxxxxxxxxx> > Reviewed-by: Ashwin Chaugule <ashwinc@xxxxxxxxxxxxxx> > Acked-by: Robert Richter <rrichter@xxxxxxxxxx> > 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 | 506 +++++++++++++++++++++++++++++++++++++++ > 1 file changed, 506 insertions(+) > create mode 100644 Documentation/arm64/arm-acpi.txt > > diff --git a/Documentation/arm64/arm-acpi.txt b/Documentation/arm64/arm-acpi.txt > new file mode 100644 > index 0000000..24cf832 > --- /dev/null > +++ b/Documentation/arm64/arm-acpi.txt > @@ -0,0 +1,506 @@ > +ACPI on ARMv8 Servers > +--------------------- > +ACPI can be used for ARMv8 general purpose servers designed to follow > +the ARM SBSA (Server Base System Architecture) [0] and SBBR (Server > +Base Boot Requirements) [1] specifications. Please note that the SBBR > +can be retrieved simply by visiting [1], but the SBSA is currently only > +available to those with an ARM login due to ARM IP licensing concerns. > + > +The ARMv8 kernel implements the reduced hardware model of ACPI version > +5.1 or later. Links to the specification and all external documents > +it refers to are managed by the UEFI Forum. The specification is > +available at http://www.uefi.org/specifications and documents referenced > +by the specification can be found via http://www.uefi.org/acpi. > + > +If an ARMv8 system does not meet the requirements of the SBSA and SBBR, > +or cannot be described using the mechanisms defined in the required ACPI > +specifications, then ACPI may not be a good fit for the hardware. > + > +While the documents mentioned above set out the requirements for building > +industry-standard ARMv8 servers, they also apply to more than one operating > +system. The purpose of this document is to describe the interaction between > +ACPI and Linux only, on an ARMv8 system -- that is, what Linux expects of > +ACPI and what ACPI can expect of Linux. > + > + Here. Two blank lines. > +Why ACPI on ARM? -- Thanks, Shannon -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
