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Commit fb145901 authored by Erik Schmauss's avatar Erik Schmauss Committed by Rafael J. Wysocki
Browse files

ACPI / Documentation: update ACPI customize method feature docs 



Reviewed-by: default avatarChangzhong Li <changzhong.li@intel.com>
Reviewed-by: default avatarRui Zhang <rui.zhang@intel.com>
Signed-off-by: default avatarErik Schmauss <erik.schmauss@intel.com>
Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
parent f4fe74cc

Documentation/acpi/method-customizing.txt

+5 −5
Original line number Diff line number Diff line
@@ -16,7 +16,8 @@ control method rather than override the entire DSDT, because kernel 
rebuild/reboot is not needed and test result can be got in minutes.



Note: Only ACPI METHOD can be overridden, any other object types like

      "Device", "OperationRegion", are not recognized.

      "Device", "OperationRegion", are not recognized. Methods

      declared inside scope operators are also not supported.

Note: The same ACPI control method can be overridden for many times,

      and it's always the latest one that used by Linux/kernel.

Note: To get the ACPI debug object output (Store (AAAA, Debug)),
@@ -32,8 +33,6 @@ Note: To get the ACPI debug object output (Store (AAAA, Debug)), 


      DefinitionBlock ("", "SSDT", 1, "", "", 0x20080715)

      {

	External (ACON)



	Method (\_SB_.AC._PSR, 0, NotSerialized)

	{

		Store ("In AC _PSR", Debug)
@@ -42,9 +41,10 @@ Note: To get the ACPI debug object output (Store (AAAA, Debug)), 
      }

      Note that the full pathname of the method in ACPI namespace

      should be used.

      And remember to use "External" to declare external objects.

   e) assemble the file to generate the AML code of the method.

      e.g. "iasl psr.asl" (psr.aml is generated as a result)

      e.g. "iasl -vw 6084 psr.asl" (psr.aml is generated as a result)

      If parameter "-vw 6084" is not supported by your iASL compiler,

      please try a newer version.

   f) mount debugfs by "mount -t debugfs none /sys/kernel/debug"

   g) override the old method via the debugfs by running

      "cat /tmp/psr.aml > /sys/kernel/debug/acpi/custom_method"