Revision: 14001
http://edk2.svn.sourceforge.net/edk2/?rev=14001&view=rev
Author: jljusten
Date: 2012-12-17 02:12:44 +0000 (Mon, 17 Dec 2012)
Log Message:
-----------
OvmfPkg: fix PIIX4 SUS_TYP value in \_S4 package
The ACPI 5.0 specification says:
7.3.4.5 System \_S4 State
[...]
* DRAM context is not maintained.
[...]
This corresponds to the following in the PIIX4 spec:
PMCNTRL -- POWER MANAGEMENT CONTROL REGISTER (IO)
[...]
Bits[12:10] Suspend Type
[...]
010 POSCL (Powered On Suspend, Context Lost)
Also, this (ie. decimal 2) is the default suspend type value that qemu
recognizes as an S4 (suspend to disk) request.
Only the value for PM1a_CNT.SLP_TYP is corrected (PM1b_CNT.SLP_TYP is left
at zero), since in OVMF we don't report the optional PM1b_EVT_BLK register
block to OSPM. (PM1b_EVT_BLK is defined as 0 in "Platform.h"; see "4.8.1.1
PM1 Event Registers" in the ACPI 5.0 specification.)
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Laszlo Ersek <[email protected]>
Reviewed-by: Jordan Justen <[email protected]>
Modified Paths:
--------------
trunk/edk2/OvmfPkg/AcpiTables/Dsdt.asl
Modified: trunk/edk2/OvmfPkg/AcpiTables/Dsdt.asl
===================================================================
--- trunk/edk2/OvmfPkg/AcpiTables/Dsdt.asl 2012-12-17 02:12:30 UTC (rev
14000)
+++ trunk/edk2/OvmfPkg/AcpiTables/Dsdt.asl 2012-12-17 02:12:44 UTC (rev
14001)
@@ -17,7 +17,7 @@
// System Sleep States
//
Name (\_S0, Package () {5, 0, 0, 0}) // Working
- Name (\_S4, Package () {1, 0, 0, 0}) // Suspend to Disk
+ Name (\_S4, Package () {2, 0, 0, 0}) // Suspend to Disk (PIIX4: POSCL)
Name (\_S5, Package () {0, 0, 0, 0}) // Soft Off
//
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