sb,soc/amd: Drop OSFL method in ASL

Variable OSVR had a static value of 3 and OSFL() did not
actually call _OSI or _OS methods.

The conditional in HDA _INI method of OSVR is dropped and
use of DMA NoSnoop attribute remains disabled to retain
previous behaviour. For soc/amd/picasso a different decision
was made in CB:40782 as HDA _INI method was just dropped and
default configuration enables use of DMA NoSnoop attribute.

Change-Id: I967b7b2afbb43253cccb4b77f6c44db45e2989e4
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/50592
Reviewed-by: Furquan Shaikh <furquan@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

25 files changed, 9 insertions, 150 deletions

diff --git a/src/mainboard/amd/gardenia/acpi/mainboard.asl b/src/mainboard/amd/gardenia/acpi/mainboard.asl
index 6ca0fa82b2..3875174f5d 100644
--- a/src/mainboard/amd/gardenia/acpi/mainboard.asl
+++ b/src/mainboard/amd/gardenia/acpi/mainboard.asl
@@ -8,6 +8,3 @@ Name(PBLN, 0x0)	/* Length of BIOS area */
 Name(PCBA, CONFIG_MMCONF_BASE_ADDRESS)	/* Base address of PCIe config space */
 Name(PCLN, Multiply(0x100000, CONFIG_MMCONF_BUS_NUMBER)) /* Length of PCIe config space, 1MB each bus */
 Name(HPBA, 0xFED00000)	/* Base address of HPET table */
-
-/* Some global data */
-Name(OSVR, 3)	/* Assume nothing. WinXp = 1, Vista = 2, Linux = 3, WinCE = 4 */
diff --git a/src/mainboard/amd/olivehill/acpi/mainboard.asl b/src/mainboard/amd/olivehill/acpi/mainboard.asl
index eeca9ee8f7..f512582a02 100644
--- a/src/mainboard/amd/olivehill/acpi/mainboard.asl
+++ b/src/mainboard/amd/olivehill/acpi/mainboard.asl
@@ -9,9 +9,6 @@ Name(PCBA, CONFIG_MMCONF_BASE_ADDRESS)	/* Base address of PCIe config space */
 Name(PCLN, Multiply(0x100000, CONFIG_MMCONF_BUS_NUMBER)) /* Length of PCIe config space, 1MB each bus */
 Name(HPBA, 0xFED00000)	/* Base address of HPET table */
 
-/* Some global data */
-Name(OSVR, 3)	/* Assume nothing. WinXp = 1, Vista = 2, Linux = 3, WinCE = 4 */
-
 /* AcpiGpe0Blk */
 OperationRegion(GP0B, SystemMemory, 0xfed80814, 0x04)
 	Field(GP0B, ByteAcc, NoLock, Preserve) {
diff --git a/src/mainboard/amd/padmelon/acpi/mainboard.asl b/src/mainboard/amd/padmelon/acpi/mainboard.asl
index 6ca0fa82b2..3875174f5d 100644
--- a/src/mainboard/amd/padmelon/acpi/mainboard.asl
+++ b/src/mainboard/amd/padmelon/acpi/mainboard.asl
@@ -8,6 +8,3 @@ Name(PBLN, 0x0)	/* Length of BIOS area */
 Name(PCBA, CONFIG_MMCONF_BASE_ADDRESS)	/* Base address of PCIe config space */
 Name(PCLN, Multiply(0x100000, CONFIG_MMCONF_BUS_NUMBER)) /* Length of PCIe config space, 1MB each bus */
 Name(HPBA, 0xFED00000)	/* Base address of HPET table */
-
-/* Some global data */
-Name(OSVR, 3)	/* Assume nothing. WinXp = 1, Vista = 2, Linux = 3, WinCE = 4 */
diff --git a/src/mainboard/amd/parmer/acpi/mainboard.asl b/src/mainboard/amd/parmer/acpi/mainboard.asl
index 77f2982f98..8810d47395 100644
--- a/src/mainboard/amd/parmer/acpi/mainboard.asl
+++ b/src/mainboard/amd/parmer/acpi/mainboard.asl
@@ -11,9 +11,6 @@
 	Name(PCLN, Multiply(0x100000, CONFIG_MMCONF_BUS_NUMBER)) /* Length of PCIe config space, 1MB each bus */
 	Name(HPBA, 0xFED00000)	/* Base address of HPET table */
 
-	/* Some global data */
-	Name(OSVR, 3)   /* Assume nothing. WinXp = 1, Vista = 2, Linux = 3, WinCE = 4 */
-
 	/* AcpiGpe0Blk */
 	OperationRegion(GP0B, SystemMemory, 0xfed80814, 0x04)
 		Field(GP0B, ByteAcc, NoLock, Preserve) {
diff --git a/src/mainboard/amd/thatcher/acpi/mainboard.asl b/src/mainboard/amd/thatcher/acpi/mainboard.asl
index 77f2982f98..8810d47395 100644
--- a/src/mainboard/amd/thatcher/acpi/mainboard.asl
+++ b/src/mainboard/amd/thatcher/acpi/mainboard.asl
@@ -11,9 +11,6 @@
 	Name(PCLN, Multiply(0x100000, CONFIG_MMCONF_BUS_NUMBER)) /* Length of PCIe config space, 1MB each bus */
 	Name(HPBA, 0xFED00000)	/* Base address of HPET table */
 
-	/* Some global data */
-	Name(OSVR, 3)   /* Assume nothing. WinXp = 1, Vista = 2, Linux = 3, WinCE = 4 */
-
 	/* AcpiGpe0Blk */
 	OperationRegion(GP0B, SystemMemory, 0xfed80814, 0x04)
 		Field(GP0B, ByteAcc, NoLock, Preserve) {
diff --git a/src/mainboard/asrock/imb-a180/acpi/mainboard.asl b/src/mainboard/asrock/imb-a180/acpi/mainboard.asl
index eeca9ee8f7..f512582a02 100644
--- a/src/mainboard/asrock/imb-a180/acpi/mainboard.asl
+++ b/src/mainboard/asrock/imb-a180/acpi/mainboard.asl
@@ -9,9 +9,6 @@ Name(PCBA, CONFIG_MMCONF_BASE_ADDRESS)	/* Base address of PCIe config space */
 Name(PCLN, Multiply(0x100000, CONFIG_MMCONF_BUS_NUMBER)) /* Length of PCIe config space, 1MB each bus */
 Name(HPBA, 0xFED00000)	/* Base address of HPET table */
 
-/* Some global data */
-Name(OSVR, 3)	/* Assume nothing. WinXp = 1, Vista = 2, Linux = 3, WinCE = 4 */
-
 /* AcpiGpe0Blk */
 OperationRegion(GP0B, SystemMemory, 0xfed80814, 0x04)
 	Field(GP0B, ByteAcc, NoLock, Preserve) {
diff --git a/src/mainboard/asus/a88xm-e/acpi/mainboard.asl b/src/mainboard/asus/a88xm-e/acpi/mainboard.asl
index ddd5de3909..2062962ec9 100644
--- a/src/mainboard/asus/a88xm-e/acpi/mainboard.asl
+++ b/src/mainboard/asus/a88xm-e/acpi/mainboard.asl
@@ -13,6 +13,3 @@
 	Name(PCLN, Multiply(0x100000, CONFIG_MMCONF_BUS_NUMBER))
 	/* Base address of HPET table */
 	Name(HPBA, 0xFED00000)
-
-	/* Some global data */
-	Name(OSVR, 3)   /* Assume nothing. WinXp = 1, Vista = 2, Linux = 3, WinCE = 4 */
diff --git a/src/mainboard/asus/am1i-a/acpi/mainboard.asl b/src/mainboard/asus/am1i-a/acpi/mainboard.asl
index eeca9ee8f7..f512582a02 100644
--- a/src/mainboard/asus/am1i-a/acpi/mainboard.asl
+++ b/src/mainboard/asus/am1i-a/acpi/mainboard.asl
@@ -9,9 +9,6 @@ Name(PCBA, CONFIG_MMCONF_BASE_ADDRESS)	/* Base address of PCIe config space */
 Name(PCLN, Multiply(0x100000, CONFIG_MMCONF_BUS_NUMBER)) /* Length of PCIe config space, 1MB each bus */
 Name(HPBA, 0xFED00000)	/* Base address of HPET table */
 
-/* Some global data */
-Name(OSVR, 3)	/* Assume nothing. WinXp = 1, Vista = 2, Linux = 3, WinCE = 4 */
-
 /* AcpiGpe0Blk */
 OperationRegion(GP0B, SystemMemory, 0xfed80814, 0x04)
 	Field(GP0B, ByteAcc, NoLock, Preserve) {
diff --git a/src/mainboard/asus/f2a85-m/acpi/mainboard.asl b/src/mainboard/asus/f2a85-m/acpi/mainboard.asl
index 4a8408645e..9ccdbeff45 100644
--- a/src/mainboard/asus/f2a85-m/acpi/mainboard.asl
+++ b/src/mainboard/asus/f2a85-m/acpi/mainboard.asl
@@ -10,6 +10,3 @@
 	Name(PCBA, CONFIG_MMCONF_BASE_ADDRESS)	/* Base address of PCIe config space */
 	Name(PCLN, Multiply(0x100000, CONFIG_MMCONF_BUS_NUMBER)) /* Length of PCIe config space, 1MB each bus */
 	Name(HPBA, 0xFED00000)	/* Base address of HPET table */
-
-	/* Some global data */
-	Name(OSVR, 3)   /* Assume nothing. WinXp = 1, Vista = 2, Linux = 3, WinCE = 4 */
diff --git a/src/mainboard/bap/ode_e20XX/acpi/mainboard.asl b/src/mainboard/bap/ode_e20XX/acpi/mainboard.asl
index eeca9ee8f7..f512582a02 100644
--- a/src/mainboard/bap/ode_e20XX/acpi/mainboard.asl
+++ b/src/mainboard/bap/ode_e20XX/acpi/mainboard.asl
@@ -9,9 +9,6 @@ Name(PCBA, CONFIG_MMCONF_BASE_ADDRESS)	/* Base address of PCIe config space */
 Name(PCLN, Multiply(0x100000, CONFIG_MMCONF_BUS_NUMBER)) /* Length of PCIe config space, 1MB each bus */
 Name(HPBA, 0xFED00000)	/* Base address of HPET table */
 
-/* Some global data */
-Name(OSVR, 3)	/* Assume nothing. WinXp = 1, Vista = 2, Linux = 3, WinCE = 4 */
-
 /* AcpiGpe0Blk */
 OperationRegion(GP0B, SystemMemory, 0xfed80814, 0x04)
 	Field(GP0B, ByteAcc, NoLock, Preserve) {
diff --git a/src/mainboard/biostar/a68n_5200/acpi/mainboard.asl b/src/mainboard/biostar/a68n_5200/acpi/mainboard.asl
index eeca9ee8f7..f512582a02 100644
--- a/src/mainboard/biostar/a68n_5200/acpi/mainboard.asl
+++ b/src/mainboard/biostar/a68n_5200/acpi/mainboard.asl
@@ -9,9 +9,6 @@ Name(PCBA, CONFIG_MMCONF_BASE_ADDRESS)	/* Base address of PCIe config space */
 Name(PCLN, Multiply(0x100000, CONFIG_MMCONF_BUS_NUMBER)) /* Length of PCIe config space, 1MB each bus */
 Name(HPBA, 0xFED00000)	/* Base address of HPET table */
 
-/* Some global data */
-Name(OSVR, 3)	/* Assume nothing. WinXp = 1, Vista = 2, Linux = 3, WinCE = 4 */
-
 /* AcpiGpe0Blk */
 OperationRegion(GP0B, SystemMemory, 0xfed80814, 0x04)
 	Field(GP0B, ByteAcc, NoLock, Preserve) {
diff --git a/src/mainboard/biostar/am1ml/acpi/mainboard.asl b/src/mainboard/biostar/am1ml/acpi/mainboard.asl
index eeca9ee8f7..f512582a02 100644
--- a/src/mainboard/biostar/am1ml/acpi/mainboard.asl
+++ b/src/mainboard/biostar/am1ml/acpi/mainboard.asl
@@ -9,9 +9,6 @@ Name(PCBA, CONFIG_MMCONF_BASE_ADDRESS)	/* Base address of PCIe config space */
 Name(PCLN, Multiply(0x100000, CONFIG_MMCONF_BUS_NUMBER)) /* Length of PCIe config space, 1MB each bus */
 Name(HPBA, 0xFED00000)	/* Base address of HPET table */
 
-/* Some global data */
-Name(OSVR, 3)	/* Assume nothing. WinXp = 1, Vista = 2, Linux = 3, WinCE = 4 */
-
 /* AcpiGpe0Blk */
 OperationRegion(GP0B, SystemMemory, 0xfed80814, 0x04)
 	Field(GP0B, ByteAcc, NoLock, Preserve) {
diff --git a/src/mainboard/gizmosphere/gizmo2/acpi/mainboard.asl b/src/mainboard/gizmosphere/gizmo2/acpi/mainboard.asl
index eeca9ee8f7..f512582a02 100644
--- a/src/mainboard/gizmosphere/gizmo2/acpi/mainboard.asl
+++ b/src/mainboard/gizmosphere/gizmo2/acpi/mainboard.asl
@@ -9,9 +9,6 @@ Name(PCBA, CONFIG_MMCONF_BASE_ADDRESS)	/* Base address of PCIe config space */
 Name(PCLN, Multiply(0x100000, CONFIG_MMCONF_BUS_NUMBER)) /* Length of PCIe config space, 1MB each bus */
 Name(HPBA, 0xFED00000)	/* Base address of HPET table */
 
-/* Some global data */
-Name(OSVR, 3)	/* Assume nothing. WinXp = 1, Vista = 2, Linux = 3, WinCE = 4 */
-
 /* AcpiGpe0Blk */
 OperationRegion(GP0B, SystemMemory, 0xfed80814, 0x04)
 	Field(GP0B, ByteAcc, NoLock, Preserve) {
diff --git a/src/mainboard/google/kahlee/variants/baseboard/include/baseboard/acpi/mainboard.asl b/src/mainboard/google/kahlee/variants/baseboard/include/baseboard/acpi/mainboard.asl
index cee1af9e14..c983b6439c 100644
--- a/src/mainboard/google/kahlee/variants/baseboard/include/baseboard/acpi/mainboard.asl
+++ b/src/mainboard/google/kahlee/variants/baseboard/include/baseboard/acpi/mainboard.asl
@@ -13,6 +13,3 @@ Name (PCLN, Multiply(0x100000, CONFIG_MMCONF_BUS_NUMBER))
 
 /* Base address of HPET table */
 Name (HPBA, 0xFED00000)
-
-/* Global Data */
-Name (OSVR, 3)		/* WinXp = 1, Vista = 2, Linux = 3, WinCE = 4 */
diff --git a/src/mainboard/hp/abm/acpi/mainboard.asl b/src/mainboard/hp/abm/acpi/mainboard.asl
index ae1e51b4c0..7b726b737a 100644
--- a/src/mainboard/hp/abm/acpi/mainboard.asl
+++ b/src/mainboard/hp/abm/acpi/mainboard.asl
@@ -9,9 +9,6 @@ Name(PCBA, CONFIG_MMCONF_BASE_ADDRESS)	/* Base address of PCIe config space */
 Name(PCLN, Multiply(0x100000, CONFIG_MMCONF_BUS_NUMBER)) /* Length of PCIe config space, 1MB each bus */
 Name(HPBA, 0xFED00000)	/* Base address of HPET table */
 
-/* Some global data */
-Name(OSVR, 3)	/* Assume nothing. WinXp = 1, Vista = 2, Linux = 3, WinCE = 4 */
-
 /* AcpiGpe0Blk */
 OperationRegion(GP0B, SystemMemory, 0xfed80814, 0x04)
 	Field(GP0B, ByteAcc, NoLock, Preserve) { , 11, USBS, 1, }
diff --git a/src/mainboard/hp/pavilion_m6_1035dx/acpi/mainboard.asl b/src/mainboard/hp/pavilion_m6_1035dx/acpi/mainboard.asl
index 87eac9d804..4bde39df7c 100644
--- a/src/mainboard/hp/pavilion_m6_1035dx/acpi/mainboard.asl
+++ b/src/mainboard/hp/pavilion_m6_1035dx/acpi/mainboard.asl
@@ -11,9 +11,6 @@
 	Name(PCLN, Multiply(0x100000, CONFIG_MMCONF_BUS_NUMBER)) /* Length of PCIe config space, 1MB each bus */
 	Name(HPBA, 0xFED00000)	/* Base address of HPET table */
 
-	/* Some global data */
-	Name(OSVR, 3)   /* Assume nothing. WinXp = 1, Vista = 2, Linux = 3, WinCE = 4 */
-
 	/* AcpiGpe0Blk */
 	OperationRegion(GP0B, SystemMemory, 0xfed80814, 0x04)
 		Field(GP0B, ByteAcc, NoLock, Preserve) {
diff --git a/src/mainboard/lenovo/g505s/acpi/mainboard.asl b/src/mainboard/lenovo/g505s/acpi/mainboard.asl
index 87eac9d804..4bde39df7c 100644
--- a/src/mainboard/lenovo/g505s/acpi/mainboard.asl
+++ b/src/mainboard/lenovo/g505s/acpi/mainboard.asl
@@ -11,9 +11,6 @@
 	Name(PCLN, Multiply(0x100000, CONFIG_MMCONF_BUS_NUMBER)) /* Length of PCIe config space, 1MB each bus */
 	Name(HPBA, 0xFED00000)	/* Base address of HPET table */
 
-	/* Some global data */
-	Name(OSVR, 3)   /* Assume nothing. WinXp = 1, Vista = 2, Linux = 3, WinCE = 4 */
-
 	/* AcpiGpe0Blk */
 	OperationRegion(GP0B, SystemMemory, 0xfed80814, 0x04)
 		Field(GP0B, ByteAcc, NoLock, Preserve) {
diff --git a/src/mainboard/msi/ms7721/acpi/mainboard.asl b/src/mainboard/msi/ms7721/acpi/mainboard.asl
index 4a8408645e..9ccdbeff45 100644
--- a/src/mainboard/msi/ms7721/acpi/mainboard.asl
+++ b/src/mainboard/msi/ms7721/acpi/mainboard.asl
@@ -10,6 +10,3 @@
 	Name(PCBA, CONFIG_MMCONF_BASE_ADDRESS)	/* Base address of PCIe config space */
 	Name(PCLN, Multiply(0x100000, CONFIG_MMCONF_BUS_NUMBER)) /* Length of PCIe config space, 1MB each bus */
 	Name(HPBA, 0xFED00000)	/* Base address of HPET table */
-
-	/* Some global data */
-	Name(OSVR, 3)   /* Assume nothing. WinXp = 1, Vista = 2, Linux = 3, WinCE = 4 */
diff --git a/src/mainboard/pcengines/apu2/acpi/mainboard.asl b/src/mainboard/pcengines/apu2/acpi/mainboard.asl
index eeca9ee8f7..f512582a02 100644
--- a/src/mainboard/pcengines/apu2/acpi/mainboard.asl
+++ b/src/mainboard/pcengines/apu2/acpi/mainboard.asl
@@ -9,9 +9,6 @@ Name(PCBA, CONFIG_MMCONF_BASE_ADDRESS)	/* Base address of PCIe config space */
 Name(PCLN, Multiply(0x100000, CONFIG_MMCONF_BUS_NUMBER)) /* Length of PCIe config space, 1MB each bus */
 Name(HPBA, 0xFED00000)	/* Base address of HPET table */
 
-/* Some global data */
-Name(OSVR, 3)	/* Assume nothing. WinXp = 1, Vista = 2, Linux = 3, WinCE = 4 */
-
 /* AcpiGpe0Blk */
 OperationRegion(GP0B, SystemMemory, 0xfed80814, 0x04)
 	Field(GP0B, ByteAcc, NoLock, Preserve) {
diff --git a/src/soc/amd/stoneyridge/acpi/sb_pci0_fch.asl b/src/soc/amd/stoneyridge/acpi/sb_pci0_fch.asl
index 2c4bdbf547..40e882c004 100644
--- a/src/soc/amd/stoneyridge/acpi/sb_pci0_fch.asl
+++ b/src/soc/amd/stoneyridge/acpi/sb_pci0_fch.asl
@@ -134,9 +134,6 @@ Method(_INI, 0, Serialized) {
 	/* DBGO(\_REV) */
 	/* DBGO("\n") */
 
-	/* Determine the OS we're running on */
-	OSFL()
-
 	/* Send ALIB Function 1 the AC/DC state */
 	Name(F1BF, Buffer(0x03){})
 	CreateWordField(F1BF, 0, F1SZ)
@@ -149,27 +146,6 @@ Method(_INI, 0, Serialized) {
 
 } /* End Method(_SB._INI) */
 
-Method(OSFL, 0){
-
-	if (OSVR != Ones) {Return (OSVR)}	/* OS version was already detected */
-
-	if (CondRefOf(\_OSI))
-	{
-		OSVR = 1				/* Assume some form of XP */
-		if (\_OSI("Windows 2006"))		/* Vista */
-		{
-			OSVR = 2
-		}
-	} else {
-		If (WCMP(\_OS,"Linux")) {
-			OSVR = 3			/* Linux */
-		} Else {
-			OSVR = 4			/* Gotta be WinCE */
-		}
-	}
-	Return (OSVR)
-}
-
 OperationRegion(SMIC, SystemMemory, 0xfed80000, 0x80000)
 Field( SMIC, ByteAcc, NoLock, Preserve) {
 	/* MISC registers */
diff --git a/src/soc/amd/stoneyridge/northbridge.c b/src/soc/amd/stoneyridge/northbridge.c
index 2c90d04ff9..eb59cdce4c 100644
--- a/src/soc/amd/stoneyridge/northbridge.c
+++ b/src/soc/amd/stoneyridge/northbridge.c
@@ -519,23 +519,17 @@ void hda_soc_ssdt_quirks(const struct device *dev)
 
 	/*
 	 * Method (_INI, 0, NotSerialized) {
-	 *	If (LEqual (OSVR, 0x03)) {
-	 *		Store (Zero, NSEN)
-	 *		Store (One, NSDO)
-	 *		Store (One, NSDI)
-	 *	}
+	 *	Store (Zero, NSEN)
+	 *	Store (One, NSDO)
+	 *	Store (One, NSDI)
 	 * }
 	 */
 	acpigen_write_method("_INI", 0);
 
-	acpigen_write_if_lequal_namestr_int("OSVR", 0x03);
-
 	acpigen_write_store_op_to_namestr(ZERO_OP, "NSEN");
 	acpigen_write_store_op_to_namestr(ONE_OP, "NSDO");
 	acpigen_write_store_op_to_namestr(ONE_OP, "NSDI");
 
-	acpigen_pop_len(); /* If */
-
 	acpigen_pop_len(); /* Method _INI */
 
 	acpigen_pop_len(); /* Scope */
diff --git a/src/southbridge/amd/agesa/hudson/acpi/audio.asl b/src/southbridge/amd/agesa/hudson/acpi/audio.asl
index 8eb0e6d847..58f566e70b 100644
--- a/src/southbridge/amd/agesa/hudson/acpi/audio.asl
+++ b/src/southbridge/amd/agesa/hudson/acpi/audio.asl
@@ -28,11 +28,8 @@ Device(AZHD) {	/* 0:14.2 - HD Audio */
 
 	Method (_INI, 0, NotSerialized)
 	{
-		If (OSVR == 0x03)
-		{
-			NSEN = 0
-			NSDO = 1
-			NSDI = 1
-		}
+		NSEN = 0
+		NSDO = 1
+		NSDI = 1
 	}
 } /* end AZHD */
diff --git a/src/southbridge/amd/agesa/hudson/acpi/fch.asl b/src/southbridge/amd/agesa/hudson/acpi/fch.asl
index 400f15f4f1..38f2bca6da 100644
--- a/src/southbridge/amd/agesa/hudson/acpi/fch.asl
+++ b/src/southbridge/amd/agesa/hudson/acpi/fch.asl
@@ -158,33 +158,9 @@ Method(_INI, 0) {
 	/* DBGO(\_REV) */
 	/* DBGO("\n") */
 
-	/* Determine the OS we're running on */
-	OSFL()
-
 #if CONFIG(HUDSON_IMC_FWM)
 #if CONFIG(ACPI_ENABLE_THERMAL_ZONE)
 	ITZE() /* enable IMC Fan Control*/
 #endif
 #endif
 } /* End Method(_SB._INI) */
-
-Method(OSFL, 0){
-
-	if (OSVR != Ones) {Return (OSVR)}	/* OS version was already detected */
-
-	if (CondRefOf(\_OSI))
-	{
-		OSVR = 1				/* Assume some form of XP */
-		if (\_OSI("Windows 2006"))		/* Vista */
-		{
-			OSVR = 2
-		}
-	} else {
-		If (WCMP(\_OS,"Linux")) {
-			OSVR = 3			/* Linux */
-		} Else {
-			OSVR = 4			/* Gotta be WinCE */
-		}
-	}
-	Return (OSVR)
-}
diff --git a/src/southbridge/amd/pi/hudson/acpi/audio.asl b/src/southbridge/amd/pi/hudson/acpi/audio.asl
index 8eb0e6d847..58f566e70b 100644
--- a/src/southbridge/amd/pi/hudson/acpi/audio.asl
+++ b/src/southbridge/amd/pi/hudson/acpi/audio.asl
@@ -28,11 +28,8 @@ Device(AZHD) {	/* 0:14.2 - HD Audio */
 
 	Method (_INI, 0, NotSerialized)
 	{
-		If (OSVR == 0x03)
-		{
-			NSEN = 0
-			NSDO = 1
-			NSDI = 1
-		}
+		NSEN = 0
+		NSDO = 1
+		NSDI = 1
 	}
 } /* end AZHD */
diff --git a/src/southbridge/amd/pi/hudson/acpi/fch.asl b/src/southbridge/amd/pi/hudson/acpi/fch.asl
index 25b53d3e19..88cf47f7ef 100644
--- a/src/southbridge/amd/pi/hudson/acpi/fch.asl
+++ b/src/southbridge/amd/pi/hudson/acpi/fch.asl
@@ -144,33 +144,9 @@ Method(_INI, 0) {
 	/* DBGO(\_REV) */
 	/* DBGO("\n") */
 
-	/* Determine the OS we're running on */
-	OSFL()
-
 #if CONFIG(HUDSON_IMC_FWM)
 #if CONFIG(ACPI_ENABLE_THERMAL_ZONE)
 	ITZE() /* enable IMC Fan Control*/
 #endif
 #endif
 } /* End Method(_SB._INI) */
-
-Method(OSFL, 0){
-
-	if (OSVR != Ones) {Return (OSVR)}	/* OS version was already detected */
-
-	if (CondRefOf(\_OSI))
-	{
-		OSVR = 1				/* Assume some form of XP */
-		if (\_OSI("Windows 2006"))		/* Vista */
-		{
-			OSVR = 2
-		}
-	} else {
-		If (WCMP(\_OS,"Linux")) {
-			OSVR = 3			/* Linux */
-		} Else {
-			OSVR = 4			/* Gotta be WinCE */
-		}
-	}
-	Return (OSVR)
-}