diff --git a/src/mainboard/amd/dinar/fadt.c b/src/mainboard/amd/dinar/fadt.c
index 51379643e7..7553852966 100644
--- a/src/mainboard/amd/dinar/fadt.c
+++ b/src/mainboard/amd/dinar/fadt.c
@@ -48,8 +48,16 @@ void acpi_create_fadt(acpi_fadt_t * fadt, acpi_facs_t * facs, void *dsdt)
 	memcpy(header->asl_compiler_id, ASLC, 4);
 	header->asl_compiler_revision = 0;
 
-	fadt->firmware_ctrl = (u32) facs;
-	fadt->dsdt = (u32) dsdt;
+	if ((uintptr_t)facs > 0xffffffff)
+		printk(BIOS_DEBUG, "ACPI: FACS lives above 4G\n");
+	else
+		fadt->firmware_ctrl = (uintptr_t)facs;
+
+	if ((uintptr_t)dsdt > 0xffffffff)
+		printk(BIOS_DEBUG, "ACPI: DSDT lives above 4G\n");
+	else
+		fadt->dsdt = (uintptr_t)dsdt;
+
 	/* 3=Workstation,4=Enterprise Server, 7=Performance Server */
 	fadt->preferred_pm_profile = 0x03;
 	fadt->sci_int = 9;
@@ -102,10 +110,10 @@ void acpi_create_fadt(acpi_fadt_t * fadt, acpi_facs_t * facs, void *dsdt)
 	fadt->reset_reg.addrh = 0x0;
 
 	fadt->reset_value = 6;
-	fadt->x_firmware_ctl_l = (u32) facs;
-	fadt->x_firmware_ctl_h = 0;
-	fadt->x_dsdt_l = (u32) dsdt;
-	fadt->x_dsdt_h = 0;
+	fadt->x_firmware_ctl_l = ((uintptr_t)facs) & 0xffffffff;
+	fadt->x_firmware_ctl_h = ((uint64_t)(uintptr_t)facs) >> 32;
+	fadt->x_dsdt_l = ((uintptr_t)dsdt) & 0xffffffff;
+	fadt->x_dsdt_h = ((uint64_t)(uintptr_t)dsdt) >> 32;
 
 	fadt->x_pm1a_evt_blk.space_id = 1;
 	fadt->x_pm1a_evt_blk.bit_width = 32;
diff --git a/src/mainboard/amd/dinar/mptable.c b/src/mainboard/amd/dinar/mptable.c
index 172c49794e..aeefe5463e 100644
--- a/src/mainboard/amd/dinar/mptable.c
+++ b/src/mainboard/amd/dinar/mptable.c
@@ -59,7 +59,7 @@ static void *smp_write_config_table(void *v)
 	dev = dev_find_slot(0, PCI_DEVFN(0x14, 0));
 	if (dev) {
 		/* Set sb700 IOAPIC ID */
-		dword = (u8 *)(pci_read_config32(dev, 0x74) & 0xfffffff0);
+		dword = (u8 *)(uintptr_t)(pci_read_config32(dev, 0x74) & 0xfffffff0);
 		smp_write_ioapic(mc, apicid_sb700, 0x20, dword);
 
 		/*
@@ -80,7 +80,7 @@ static void *smp_write_config_table(void *v)
 		dev = dev_find_slot(0, PCI_DEVFN(0, 0));
 		if (dev) {
 			pci_write_config32(dev, 0xF8, 0x1);
-			dword = (u8 *)(pci_read_config32(dev, 0xFC) & 0xfffffff0);
+			dword = (u8 *)(uintptr_t)(pci_read_config32(dev, 0xFC) & 0xfffffff0);
 			smp_write_ioapic(mc, apicid_rd890, 0x20, dword);
 		}
 
diff --git a/src/mainboard/amd/dinar/rd890_cfg.c b/src/mainboard/amd/dinar/rd890_cfg.c
index c90f9f00bb..06b335f134 100644
--- a/src/mainboard/amd/dinar/rd890_cfg.c
+++ b/src/mainboard/amd/dinar/rd890_cfg.c
@@ -109,7 +109,7 @@ static void nb_platform_config(device_t nb_dev, AMD_NB_CONFIG *NbConfigPtr)
  * @param[in] *config  Northbridge configuration structure pointer.
  *
  */
-static u32 rd890_callout_entry(u32 func, u32 data, void *config)
+static u32 rd890_callout_entry(u32 func, uintptr_t data, void *config)
 {
 	u32 ret = 0;
 #ifndef __PRE_RAM__
diff --git a/src/mainboard/amd/torpedo/fadt.c b/src/mainboard/amd/torpedo/fadt.c
index 1bab63858d..2cdbc42083 100644
--- a/src/mainboard/amd/torpedo/fadt.c
+++ b/src/mainboard/amd/torpedo/fadt.c
@@ -60,8 +60,16 @@ void acpi_create_fadt(acpi_fadt_t * fadt, acpi_facs_t * facs, void *dsdt)
 	memcpy(header->asl_compiler_id, ASLC, 4);
 	header->asl_compiler_revision = 0;
 
-	fadt->firmware_ctrl = (u32) facs;
-	fadt->dsdt = (u32) dsdt;
+	if ((uintptr_t)facs > 0xffffffff)
+		printk(BIOS_DEBUG, "ACPI: FACS lives above 4G\n");
+	else
+		fadt->firmware_ctrl = (uintptr_t)facs;
+
+	if ((uintptr_t)dsdt > 0xffffffff)
+		printk(BIOS_DEBUG, "ACPI: DSDT lives above 4G\n");
+	else
+		fadt->dsdt = (uintptr_t)dsdt;
+
 	/* 3=Workstation,4=Enterprise Server, 7=Performance Server */
 	fadt->preferred_pm_profile = 0x03;
 	fadt->sci_int = 9;
@@ -138,10 +146,10 @@ void acpi_create_fadt(acpi_fadt_t * fadt, acpi_facs_t * facs, void *dsdt)
 	fadt->reset_reg.addrh = 0x0;
 
 	fadt->reset_value = 6;
-	fadt->x_firmware_ctl_l = (u32) facs;
-	fadt->x_firmware_ctl_h = 0;
-	fadt->x_dsdt_l = (u32) dsdt;
-	fadt->x_dsdt_h = 0;
+	fadt->x_firmware_ctl_l = ((uintptr_t)facs) & 0xffffffff;
+	fadt->x_firmware_ctl_h = ((uint64_t)(uintptr_t)facs) >> 32;
+	fadt->x_dsdt_l = ((uintptr_t)dsdt) & 0xffffffff;
+	fadt->x_dsdt_h = ((uint64_t)(uintptr_t)dsdt) >> 32;
 
 	fadt->x_pm1a_evt_blk.space_id = 1;
 	fadt->x_pm1a_evt_blk.bit_width = 32;
diff --git a/src/mainboard/gizmosphere/gizmo/mainboard.c b/src/mainboard/gizmosphere/gizmo/mainboard.c
index d04a0aaca2..866806cbad 100644
--- a/src/mainboard/gizmosphere/gizmo/mainboard.c
+++ b/src/mainboard/gizmosphere/gizmo/mainboard.c
@@ -75,17 +75,16 @@ static void mainboard_enable(device_t dev)
 	RWMEM(ACPI_MMIO_BASE + PMIO_BASE + SB_PMIOA_REGDA, AccWidthUint8, 0xFB, 0x04);
 }
 
-void mainboard_final( void *chip_info );
-void mainboard_final( void *chip_info )
+static void mainboard_final(void *chip_info)
 {
 	device_t ahci_dev;
-	u32 ABAR;
+	uintptr_t ABAR;
 	u8 *memptr;
 
 	ahci_dev = dev_find_slot(0, PCI_DEVFN(0x11, 0));
 	ABAR = pci_read_config32(ahci_dev, 0x24);
 	ABAR &= 0xFFFFFC00;
-	memptr = (u8 *) (ABAR + 0x100 + 0x80 + 0x2C); /* we're on the 2nd port */
+	memptr = (u8 *)(ABAR + 0x100 + 0x80 + 0x2C); /* we're on the 2nd port */
 	*memptr = 0x21; /* force to GEN2 and start re-negotiate */
 	mdelay (1);
 	*memptr = 0x20;
diff --git a/src/mainboard/supermicro/h8qgi/fadt.c b/src/mainboard/supermicro/h8qgi/fadt.c
index 54de8cae10..cce89487ca 100644
--- a/src/mainboard/supermicro/h8qgi/fadt.c
+++ b/src/mainboard/supermicro/h8qgi/fadt.c
@@ -49,8 +49,16 @@ void acpi_create_fadt(acpi_fadt_t * fadt, acpi_facs_t * facs, void *dsdt)
 	memcpy(header->asl_compiler_id, ASLC, 4);
 	header->asl_compiler_revision = 0;
 
-	fadt->firmware_ctrl = (u32) facs;
-	fadt->dsdt = (u32) dsdt;
+	if ((uintptr_t)facs > 0xffffffff)
+		printk(BIOS_DEBUG, "ACPI: FACS lives above 4G\n");
+	else
+		fadt->firmware_ctrl = (uintptr_t)facs;
+
+	if ((uintptr_t)dsdt > 0xffffffff)
+		printk(BIOS_DEBUG, "ACPI: DSDT lives above 4G\n");
+	else
+		fadt->dsdt = (uintptr_t)dsdt;
+
 	/* 3=Workstation,4=Enterprise Server, 7=Performance Server */
 	fadt->preferred_pm_profile = 0x03;
 	fadt->sci_int = 9;
@@ -103,10 +111,10 @@ void acpi_create_fadt(acpi_fadt_t * fadt, acpi_facs_t * facs, void *dsdt)
 	fadt->reset_reg.addrh = 0x0;
 
 	fadt->reset_value = 6;
-	fadt->x_firmware_ctl_l = (u32) facs;
-	fadt->x_firmware_ctl_h = 0;
-	fadt->x_dsdt_l = (u32) dsdt;
-	fadt->x_dsdt_h = 0;
+	fadt->x_firmware_ctl_l = ((uintptr_t)facs) & 0xffffffff;
+	fadt->x_firmware_ctl_h = ((uint64_t)(uintptr_t)facs) >> 32;
+	fadt->x_dsdt_l = ((uintptr_t)dsdt) & 0xffffffff;
+	fadt->x_dsdt_h = ((uint64_t)(uintptr_t)dsdt) >> 32;
 
 	fadt->x_pm1a_evt_blk.space_id = 1;
 	fadt->x_pm1a_evt_blk.bit_width = 32;
diff --git a/src/mainboard/supermicro/h8qgi/mptable.c b/src/mainboard/supermicro/h8qgi/mptable.c
index 9880812351..d0e0a6ee09 100644
--- a/src/mainboard/supermicro/h8qgi/mptable.c
+++ b/src/mainboard/supermicro/h8qgi/mptable.c
@@ -59,7 +59,7 @@ static void *smp_write_config_table(void *v)
 	dev = dev_find_slot(0, PCI_DEVFN(0x14, 0));
 	if (dev) {
 		/* Set SP5100 IOAPIC ID */
-		dword = (u32 *)(pci_read_config32(dev, 0x74) & 0xfffffff0);
+		dword = (u32 *)(uintptr_t)(pci_read_config32(dev, 0x74) & 0xfffffff0);
 		smp_write_ioapic(mc, apicid_sp5100, 0x20, dword);
 
 #ifdef UNUSED_CODE
@@ -96,7 +96,7 @@ static void *smp_write_config_table(void *v)
 		dev = dev_find_slot(0, PCI_DEVFN(0, 0));
 		if (dev) {
 			pci_write_config32(dev, 0xF8, 0x1);
-			dword = (u32 *)(pci_read_config32(dev, 0xFC) & 0xfffffff0);
+			dword = (u32 *)(uintptr_t)(pci_read_config32(dev, 0xFC) & 0xfffffff0);
 			smp_write_ioapic(mc, apicid_sr5650, 0x20, dword);
 		}
 
diff --git a/src/mainboard/supermicro/h8qgi/rd890_cfg.c b/src/mainboard/supermicro/h8qgi/rd890_cfg.c
index 1e78f931d6..147d32bc31 100644
--- a/src/mainboard/supermicro/h8qgi/rd890_cfg.c
+++ b/src/mainboard/supermicro/h8qgi/rd890_cfg.c
@@ -109,7 +109,7 @@ static void nb_platform_config(device_t nb_dev, AMD_NB_CONFIG *NbConfigPtr)
  * @param[in] *config  Northbridge configuration structure pointer.
  *
  */
-static u32 rd890_callout_entry(u32 func, u32 data, void *config)
+static u32 rd890_callout_entry(u32 func, uintptr_t data, void *config)
 {
 	u32 ret = 0;
 #ifndef __PRE_RAM__
diff --git a/src/mainboard/supermicro/h8scm/fadt.c b/src/mainboard/supermicro/h8scm/fadt.c
index d91ae6fb9e..b3d4762d81 100644
--- a/src/mainboard/supermicro/h8scm/fadt.c
+++ b/src/mainboard/supermicro/h8scm/fadt.c
@@ -49,8 +49,16 @@ void acpi_create_fadt(acpi_fadt_t * fadt, acpi_facs_t * facs, void *dsdt)
 	memcpy(header->asl_compiler_id, ASLC, 4);
 	header->asl_compiler_revision = 0;
 
-	fadt->firmware_ctrl = (u32) facs;
-	fadt->dsdt = (u32) dsdt;
+	if ((uintptr_t)facs > 0xffffffff)
+		printk(BIOS_DEBUG, "ACPI: FACS lives above 4G\n");
+	else
+		fadt->firmware_ctrl = (uintptr_t)facs;
+
+	if ((uintptr_t)dsdt > 0xffffffff)
+		printk(BIOS_DEBUG, "ACPI: DSDT lives above 4G\n");
+	else
+		fadt->dsdt = (uintptr_t)dsdt;
+
 	/* 3=Workstation,4=Enterprise Server, 7=Performance Server */
 	fadt->preferred_pm_profile = 0x03;
 	fadt->sci_int = 9;
@@ -103,10 +111,10 @@ void acpi_create_fadt(acpi_fadt_t * fadt, acpi_facs_t * facs, void *dsdt)
 	fadt->reset_reg.addrh = 0x0;
 
 	fadt->reset_value = 6;
-	fadt->x_firmware_ctl_l = (u32) facs;
-	fadt->x_firmware_ctl_h = 0;
-	fadt->x_dsdt_l = (u32) dsdt;
-	fadt->x_dsdt_h = 0;
+	fadt->x_firmware_ctl_l = ((uintptr_t)facs) & 0xffffffff;
+	fadt->x_firmware_ctl_h = ((uint64_t)(uintptr_t)facs) >> 32;
+	fadt->x_dsdt_l = ((uintptr_t)dsdt) & 0xffffffff;
+	fadt->x_dsdt_h = ((uint64_t)(uintptr_t)dsdt) >> 32;
 
 	fadt->x_pm1a_evt_blk.space_id = 1;
 	fadt->x_pm1a_evt_blk.bit_width = 32;
diff --git a/src/mainboard/supermicro/h8scm/mptable.c b/src/mainboard/supermicro/h8scm/mptable.c
index d5ee68d48a..d5cdf246f3 100644
--- a/src/mainboard/supermicro/h8scm/mptable.c
+++ b/src/mainboard/supermicro/h8scm/mptable.c
@@ -59,7 +59,7 @@ static void *smp_write_config_table(void *v)
 	dev = dev_find_slot(0, PCI_DEVFN(0x14, 0));
 	if (dev) {
 		/* Set SP5100 IOAPIC ID */
-		dword = (u32 *)(pci_read_config32(dev, 0x74) & 0xfffffff0);
+		dword = (u32 *)(uintptr_t)(pci_read_config32(dev, 0x74) & 0xfffffff0);
 		smp_write_ioapic(mc, apicid_sp5100, 0x20, dword);
 
 #ifdef UNUSED_CODE
@@ -96,7 +96,7 @@ static void *smp_write_config_table(void *v)
 		dev = dev_find_slot(0, PCI_DEVFN(0, 0));
 		if (dev) {
 			pci_write_config32(dev, 0xF8, 0x1);
-			dword = (u32 *)(pci_read_config32(dev, 0xFC) & 0xfffffff0);
+			dword = (u32 *)(uintptr_t)(pci_read_config32(dev, 0xFC) & 0xfffffff0);
 			smp_write_ioapic(mc, apicid_sr5650, 0x20, dword);
 		}
 
diff --git a/src/mainboard/supermicro/h8scm/rd890_cfg.c b/src/mainboard/supermicro/h8scm/rd890_cfg.c
index 1e78f931d6..147d32bc31 100644
--- a/src/mainboard/supermicro/h8scm/rd890_cfg.c
+++ b/src/mainboard/supermicro/h8scm/rd890_cfg.c
@@ -109,7 +109,7 @@ static void nb_platform_config(device_t nb_dev, AMD_NB_CONFIG *NbConfigPtr)
  * @param[in] *config  Northbridge configuration structure pointer.
  *
  */
-static u32 rd890_callout_entry(u32 func, u32 data, void *config)
+static u32 rd890_callout_entry(u32 func, uintptr_t data, void *config)
 {
 	u32 ret = 0;
 #ifndef __PRE_RAM__
diff --git a/src/mainboard/tyan/s8226/fadt.c b/src/mainboard/tyan/s8226/fadt.c
index d91ae6fb9e..b3d4762d81 100644
--- a/src/mainboard/tyan/s8226/fadt.c
+++ b/src/mainboard/tyan/s8226/fadt.c
@@ -49,8 +49,16 @@ void acpi_create_fadt(acpi_fadt_t * fadt, acpi_facs_t * facs, void *dsdt)
 	memcpy(header->asl_compiler_id, ASLC, 4);
 	header->asl_compiler_revision = 0;
 
-	fadt->firmware_ctrl = (u32) facs;
-	fadt->dsdt = (u32) dsdt;
+	if ((uintptr_t)facs > 0xffffffff)
+		printk(BIOS_DEBUG, "ACPI: FACS lives above 4G\n");
+	else
+		fadt->firmware_ctrl = (uintptr_t)facs;
+
+	if ((uintptr_t)dsdt > 0xffffffff)
+		printk(BIOS_DEBUG, "ACPI: DSDT lives above 4G\n");
+	else
+		fadt->dsdt = (uintptr_t)dsdt;
+
 	/* 3=Workstation,4=Enterprise Server, 7=Performance Server */
 	fadt->preferred_pm_profile = 0x03;
 	fadt->sci_int = 9;
@@ -103,10 +111,10 @@ void acpi_create_fadt(acpi_fadt_t * fadt, acpi_facs_t * facs, void *dsdt)
 	fadt->reset_reg.addrh = 0x0;
 
 	fadt->reset_value = 6;
-	fadt->x_firmware_ctl_l = (u32) facs;
-	fadt->x_firmware_ctl_h = 0;
-	fadt->x_dsdt_l = (u32) dsdt;
-	fadt->x_dsdt_h = 0;
+	fadt->x_firmware_ctl_l = ((uintptr_t)facs) & 0xffffffff;
+	fadt->x_firmware_ctl_h = ((uint64_t)(uintptr_t)facs) >> 32;
+	fadt->x_dsdt_l = ((uintptr_t)dsdt) & 0xffffffff;
+	fadt->x_dsdt_h = ((uint64_t)(uintptr_t)dsdt) >> 32;
 
 	fadt->x_pm1a_evt_blk.space_id = 1;
 	fadt->x_pm1a_evt_blk.bit_width = 32;
diff --git a/src/mainboard/tyan/s8226/mptable.c b/src/mainboard/tyan/s8226/mptable.c
index 9880812351..d0e0a6ee09 100644
--- a/src/mainboard/tyan/s8226/mptable.c
+++ b/src/mainboard/tyan/s8226/mptable.c
@@ -59,7 +59,7 @@ static void *smp_write_config_table(void *v)
 	dev = dev_find_slot(0, PCI_DEVFN(0x14, 0));
 	if (dev) {
 		/* Set SP5100 IOAPIC ID */
-		dword = (u32 *)(pci_read_config32(dev, 0x74) & 0xfffffff0);
+		dword = (u32 *)(uintptr_t)(pci_read_config32(dev, 0x74) & 0xfffffff0);
 		smp_write_ioapic(mc, apicid_sp5100, 0x20, dword);
 
 #ifdef UNUSED_CODE
@@ -96,7 +96,7 @@ static void *smp_write_config_table(void *v)
 		dev = dev_find_slot(0, PCI_DEVFN(0, 0));
 		if (dev) {
 			pci_write_config32(dev, 0xF8, 0x1);
-			dword = (u32 *)(pci_read_config32(dev, 0xFC) & 0xfffffff0);
+			dword = (u32 *)(uintptr_t)(pci_read_config32(dev, 0xFC) & 0xfffffff0);
 			smp_write_ioapic(mc, apicid_sr5650, 0x20, dword);
 		}
 
diff --git a/src/mainboard/tyan/s8226/rd890_cfg.c b/src/mainboard/tyan/s8226/rd890_cfg.c
index 1e78f931d6..147d32bc31 100644
--- a/src/mainboard/tyan/s8226/rd890_cfg.c
+++ b/src/mainboard/tyan/s8226/rd890_cfg.c
@@ -109,7 +109,7 @@ static void nb_platform_config(device_t nb_dev, AMD_NB_CONFIG *NbConfigPtr)
  * @param[in] *config  Northbridge configuration structure pointer.
  *
  */
-static u32 rd890_callout_entry(u32 func, u32 data, void *config)
+static u32 rd890_callout_entry(u32 func, uintptr_t data, void *config)
 {
 	u32 ret = 0;
 #ifndef __PRE_RAM__