sandybridge: Move common northbridge finalize to northbridge code.

Change-Id: I6d4178e5aaffc1330b0953b0601bf6b448250a8e
Signed-off-by: Vladimir Serbinenko <phcoder@gmail.com>
Reviewed-on: http://review.coreboot.org/6920
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <pgeorgi@google.com>

14 files changed, 57 insertions, 253 deletions

diff --git a/src/mainboard/google/butterfly/romstage.c b/src/mainboard/google/butterfly/romstage.c
index 083abe1df4..03d499d69c 100644
--- a/src/mainboard/google/butterfly/romstage.c
+++ b/src/mainboard/google/butterfly/romstage.c
@@ -245,35 +245,17 @@ void main(unsigned long bist)
 	quick_ram_check();
 	post_code(0x3e);
 
-	MCHBAR16(SSKPD) = 0xCAFE;
 	cbmem_was_initted = !cbmem_recovery(boot_mode==2);
 	if (boot_mode!=2)
 		save_mrc_data(&pei_data);
 
-#if CONFIG_HAVE_ACPI_RESUME
-	/* If there is no high memory area, we didn't boot before, so
-	 * this is not a resume. In that case we just create the cbmem toc.
-	 */
-
-	*(u32 *)CBMEM_BOOT_MODE = 0;
-	*(u32 *)CBMEM_RESUME_BACKUP = 0;
-
-	if ((boot_mode == 2) && cbmem_was_initted) {
-		void *resume_backup_memory = cbmem_find(CBMEM_ID_RESUME);
-		if (resume_backup_memory) {
-			*(u32 *)CBMEM_BOOT_MODE = boot_mode;
-			*(u32 *)CBMEM_RESUME_BACKUP = (u32)resume_backup_memory;
-		}
-		/* Magic for S3 resume */
-		pci_write_config32(PCI_DEV(0, 0x00, 0), SKPAD, 0xcafed00d);
-	} else if (boot_mode == 2) {
+	if (boot_mode==2 && !cbmem_was_initted) {
 		/* Failed S3 resume, reset to come up cleanly */
 		outb(0x6, 0xcf9);
 		hlt();
-	} else {
-		pci_write_config32(PCI_DEV(0, 0x00, 0), SKPAD, 0xcafebabe);
 	}
-#endif
+	northbridge_romstage_finalize(boot_mode==2);
+
 	post_code(0x3f);
 #if CONFIG_CHROMEOS
 	init_chromeos(boot_mode);
diff --git a/src/mainboard/google/link/romstage.c b/src/mainboard/google/link/romstage.c
index 6d819b4d27..ca58262b91 100644
--- a/src/mainboard/google/link/romstage.c
+++ b/src/mainboard/google/link/romstage.c
@@ -289,35 +289,17 @@ void main(unsigned long bist)
 	quick_ram_check();
 	post_code(0x3e);
 
-	MCHBAR16(SSKPD) = 0xCAFE;
 	cbmem_was_initted = !cbmem_recovery(boot_mode==2);
 	if (boot_mode!=2)
 		save_mrc_data(&pei_data);
 
-#if CONFIG_HAVE_ACPI_RESUME
-	/* If there is no high memory area, we didn't boot before, so
-	 * this is not a resume. In that case we just create the cbmem toc.
-	 */
-
-	*(u32 *)CBMEM_BOOT_MODE = 0;
-	*(u32 *)CBMEM_RESUME_BACKUP = 0;
-
-	if ((boot_mode == 2) && cbmem_was_initted) {
-		void *resume_backup_memory = cbmem_find(CBMEM_ID_RESUME);
-		if (resume_backup_memory) {
-			*(u32 *)CBMEM_BOOT_MODE = boot_mode;
-			*(u32 *)CBMEM_RESUME_BACKUP = (u32)resume_backup_memory;
-		}
-		/* Magic for S3 resume */
-		pci_write_config32(PCI_DEV(0, 0x00, 0), SKPAD, 0xcafed00d);
-	} else if (boot_mode == 2) {
+	if (boot_mode==2 && !cbmem_was_initted) {
 		/* Failed S3 resume, reset to come up cleanly */
 		outb(0x6, 0xcf9);
 		hlt();
-	} else {
-		pci_write_config32(PCI_DEV(0, 0x00, 0), SKPAD, 0xcafebabe);
 	}
-#endif
+	northbridge_romstage_finalize(boot_mode==2);
+
 	post_code(0x3f);
 #if CONFIG_CHROMEOS
 	init_chromeos(boot_mode);
diff --git a/src/mainboard/google/parrot/romstage.c b/src/mainboard/google/parrot/romstage.c
index 6c3ec79ae9..667d639d5a 100644
--- a/src/mainboard/google/parrot/romstage.c
+++ b/src/mainboard/google/parrot/romstage.c
@@ -245,35 +245,17 @@ void main(unsigned long bist)
 	quick_ram_check();
 	post_code(0x3e);
 
-	MCHBAR16(SSKPD) = 0xCAFE;
 	cbmem_was_initted = !cbmem_recovery(boot_mode==2);
 	if (boot_mode!=2)
 		save_mrc_data(&pei_data);
 
-#if CONFIG_HAVE_ACPI_RESUME
-	/* If there is no high memory area, we didn't boot before, so
-	 * this is not a resume. In that case we just create the cbmem toc.
-	 */
-
-	*(u32 *)CBMEM_BOOT_MODE = 0;
-	*(u32 *)CBMEM_RESUME_BACKUP = 0;
-
-	if ((boot_mode == 2) && cbmem_was_initted) {
-		void *resume_backup_memory = cbmem_find(CBMEM_ID_RESUME);
-		if (resume_backup_memory) {
-			*(u32 *)CBMEM_BOOT_MODE = boot_mode;
-			*(u32 *)CBMEM_RESUME_BACKUP = (u32)resume_backup_memory;
-		}
-		/* Magic for S3 resume */
-		pci_write_config32(PCI_DEV(0, 0x00, 0), SKPAD, 0xcafed00d);
-	} else if (boot_mode == 2) {
+	if (boot_mode==2 && !cbmem_was_initted) {
 		/* Failed S3 resume, reset to come up cleanly */
 		outb(0x6, 0xcf9);
 		hlt();
-	} else {
-		pci_write_config32(PCI_DEV(0, 0x00, 0), SKPAD, 0xcafebabe);
 	}
-#endif
+	northbridge_romstage_finalize(boot_mode==2);
+
 	post_code(0x3f);
 #if CONFIG_CHROMEOS
 	init_chromeos(boot_mode);
diff --git a/src/mainboard/google/stout/romstage.c b/src/mainboard/google/stout/romstage.c
index 05caa3ecc8..7ac5297d5a 100644
--- a/src/mainboard/google/stout/romstage.c
+++ b/src/mainboard/google/stout/romstage.c
@@ -299,35 +299,17 @@ void main(unsigned long bist)
 	quick_ram_check();
 	post_code(0x3e);
 
-	MCHBAR16(SSKPD) = 0xCAFE;
 	cbmem_was_initted = !cbmem_recovery(boot_mode==2);
 	if (boot_mode!=2)
 		save_mrc_data(&pei_data);
 
-#if CONFIG_HAVE_ACPI_RESUME
-	/* If there is no high memory area, we didn't boot before, so
-	 * this is not a resume. In that case we just create the cbmem toc.
-	 */
-
-	*(u32 *)CBMEM_BOOT_MODE = 0;
-	*(u32 *)CBMEM_RESUME_BACKUP = 0;
-
-	if ((boot_mode == 2) && cbmem_was_initted) {
-		void *resume_backup_memory = cbmem_find(CBMEM_ID_RESUME);
-		if (resume_backup_memory) {
-			*(u32 *)CBMEM_BOOT_MODE = boot_mode;
-			*(u32 *)CBMEM_RESUME_BACKUP = (u32)resume_backup_memory;
-		}
-		/* Magic for S3 resume */
-		pci_write_config32(PCI_DEV(0, 0x00, 0), SKPAD, 0xcafed00d);
-	} else if (boot_mode == 2) {
+	if (boot_mode==2 && !cbmem_was_initted) {
 		/* Failed S3 resume, reset to come up cleanly */
 		outb(0x6, 0xcf9);
 		hlt();
-	} else {
-		pci_write_config32(PCI_DEV(0, 0x00, 0), SKPAD, 0xcafebabe);
 	}
-#endif
+	northbridge_romstage_finalize(boot_mode==2);
+
 	post_code(0x3f);
 #if CONFIG_CHROMEOS
 	init_chromeos(boot_mode);
diff --git a/src/mainboard/intel/emeraldlake2/romstage.c b/src/mainboard/intel/emeraldlake2/romstage.c
index e10e7b62a3..c9c2b1d41f 100644
--- a/src/mainboard/intel/emeraldlake2/romstage.c
+++ b/src/mainboard/intel/emeraldlake2/romstage.c
@@ -297,35 +297,17 @@ void main(unsigned long bist)
 	quick_ram_check();
 	post_code(0x3e);
 
-	MCHBAR16(SSKPD) = 0xCAFE;
 	cbmem_was_initted = !cbmem_recovery(boot_mode==2);
 	if (boot_mode!=2)
 		save_mrc_data(&pei_data);
 
-#if CONFIG_HAVE_ACPI_RESUME
-	/* If there is no high memory area, we didn't boot before, so
-	 * this is not a resume. In that case we just create the cbmem toc.
-	 */
-
-	*(u32 *)CBMEM_BOOT_MODE = 0;
-	*(u32 *)CBMEM_RESUME_BACKUP = 0;
-
-	if ((boot_mode == 2) && cbmem_was_initted) {
-		void *resume_backup_memory = cbmem_find(CBMEM_ID_RESUME);
-		if (resume_backup_memory) {
-			*(u32 *)CBMEM_BOOT_MODE = boot_mode;
-			*(u32 *)CBMEM_RESUME_BACKUP = (u32)resume_backup_memory;
-		}
-		/* Magic for S3 resume */
-		pci_write_config32(PCI_DEV(0, 0x00, 0), SKPAD, 0xcafed00d);
-	} else if (boot_mode == 2) {
+	if (boot_mode==2 && !cbmem_was_initted) {
 		/* Failed S3 resume, reset to come up cleanly */
 		outb(0x6, 0xcf9);
 		hlt();
-	} else {
-		pci_write_config32(PCI_DEV(0, 0x00, 0), SKPAD, 0xcafebabe);
 	}
-#endif
+	northbridge_romstage_finalize(boot_mode==2);
+
 	post_code(0x3f);
 #if CONFIG_CHROMEOS
 	init_chromeos(boot_mode);
diff --git a/src/mainboard/kontron/ktqm77/romstage.c b/src/mainboard/kontron/ktqm77/romstage.c
index 211bfb5f0b..5053530cf1 100644
--- a/src/mainboard/kontron/ktqm77/romstage.c
+++ b/src/mainboard/kontron/ktqm77/romstage.c
@@ -305,35 +305,17 @@ void main(unsigned long bist)
 	quick_ram_check();
 	post_code(0x3e);
 
-	MCHBAR16(SSKPD) = 0xCAFE;
 	cbmem_was_initted = !cbmem_recovery(boot_mode==2);
 	if (boot_mode!=2)
 		save_mrc_data(&pei_data);
 
-#if CONFIG_HAVE_ACPI_RESUME
-	/* If there is no high memory area, we didn't boot before, so
-	 * this is not a resume. In that case we just create the cbmem toc.
-	 */
-
-	*(u32 *)CBMEM_BOOT_MODE = 0;
-	*(u32 *)CBMEM_RESUME_BACKUP = 0;
-
-	if ((boot_mode == 2) && cbmem_was_initted) {
-		void *resume_backup_memory = cbmem_find(CBMEM_ID_RESUME);
-		if (resume_backup_memory) {
-			*(u32 *)CBMEM_BOOT_MODE = boot_mode;
-			*(u32 *)CBMEM_RESUME_BACKUP = (u32)resume_backup_memory;
-		}
-		/* Magic for S3 resume */
-		pci_write_config32(PCI_DEV(0, 0x00, 0), SKPAD, 0xcafed00d);
-	} else if (boot_mode == 2) {
+	if (boot_mode==2 && !cbmem_was_initted) {
 		/* Failed S3 resume, reset to come up cleanly */
 		outb(0x6, 0xcf9);
 		hlt();
-	} else {
-		pci_write_config32(PCI_DEV(0, 0x00, 0), SKPAD, 0xcafebabe);
 	}
-#endif
+	northbridge_romstage_finalize(boot_mode==2);
+
 	post_code(0x3f);
 	timestamp_add_now(TS_END_ROMSTAGE);
 }
diff --git a/src/mainboard/lenovo/t520/romstage.c b/src/mainboard/lenovo/t520/romstage.c
index 8aef922810..8fc0f5f037 100644
--- a/src/mainboard/lenovo/t520/romstage.c
+++ b/src/mainboard/lenovo/t520/romstage.c
@@ -252,36 +252,18 @@ void main(unsigned long bist)
 	quick_ram_check();
 	post_code(0x3e);
 
-	MCHBAR16(SSKPD) = 0xCAFE;
 	cbmem_was_initted = !cbmem_recovery(boot_mode == 2);
 	if (boot_mode != 2) {
 		save_mrc_data(&pei_data);
 	}
 
-#if CONFIG_HAVE_ACPI_RESUME
-	/* If there is no high memory area, we didn't boot before, so
-	 * this is not a resume. In that case we just create the cbmem toc.
-	 */
-
-	*(u32 *)CBMEM_BOOT_MODE = 0;
-	*(u32 *)CBMEM_RESUME_BACKUP = 0;
-
-	if ((boot_mode == 2) && cbmem_was_initted) {
-		void *resume_backup_memory = cbmem_find(CBMEM_ID_RESUME);
-		if (resume_backup_memory) {
-			*(u32 *)CBMEM_BOOT_MODE = boot_mode;
-			*(u32 *)CBMEM_RESUME_BACKUP = (u32)resume_backup_memory;
-		}
-		/* Magic for S3 resume */
-		pci_write_config32(PCI_DEV(0, 0x00, 0), SKPAD, 0xcafed00d);
-	} else if (boot_mode == 2) {
+	if (boot_mode==2 && !cbmem_was_initted) {
 		/* Failed S3 resume, reset to come up cleanly */
 		outb(0x6, 0xcf9);
 		hlt();
-	} else {
-		pci_write_config32(PCI_DEV(0, 0x00, 0), SKPAD, 0xcafebabe);
 	}
-#endif
+	northbridge_romstage_finalize(boot_mode==2);
+
 	post_code(0x3f);
 	timestamp_add_now(TS_END_ROMSTAGE);
 }
diff --git a/src/mainboard/lenovo/t530/romstage.c b/src/mainboard/lenovo/t530/romstage.c
index c9ad90d074..d95f10a931 100644
--- a/src/mainboard/lenovo/t530/romstage.c
+++ b/src/mainboard/lenovo/t530/romstage.c
@@ -240,28 +240,8 @@ void main(unsigned long bist)
 	rcba_config();
 	post_code(0x3d);
 
-	MCHBAR16(SSKPD) = 0xCAFE;
+	northbridge_romstage_finalize(s3resume);
 
-#if CONFIG_HAVE_ACPI_RESUME
-	/* If there is no high memory area, we didn't boot before, so
-	 * this is not a resume. In that case we just create the cbmem toc.
-	 */
-
-	*(u32 *)CBMEM_BOOT_MODE = 0;
-	*(u32 *)CBMEM_RESUME_BACKUP = 0;
-
-	if (s3resume) {
-		void *resume_backup_memory = cbmem_find(CBMEM_ID_RESUME);
-		if (resume_backup_memory) {
-			*(u32 *)CBMEM_BOOT_MODE = 2;
-			*(u32 *)CBMEM_RESUME_BACKUP = (u32)resume_backup_memory;
-		}
-		/* Magic for S3 resume */
-		pci_write_config32(PCI_DEV(0, 0x00, 0), SKPAD, 0xcafed00d);
-	} else {
-		pci_write_config32(PCI_DEV(0, 0x00, 0), SKPAD, 0xcafebabe);
-	}
-#endif
 	post_code(0x3f);
 	timestamp_add_now(TS_END_ROMSTAGE);
 }
diff --git a/src/mainboard/lenovo/x220/romstage.c b/src/mainboard/lenovo/x220/romstage.c
index 04d577b6b6..59563f9286 100644
--- a/src/mainboard/lenovo/x220/romstage.c
+++ b/src/mainboard/lenovo/x220/romstage.c
@@ -238,28 +238,8 @@ void main(unsigned long bist)
 	rcba_config();
 	post_code(0x3d);
 
-	MCHBAR16(SSKPD) = 0xCAFE;
+	northbridge_romstage_finalize(s3resume);
 
-#if CONFIG_HAVE_ACPI_RESUME
-	/* If there is no high memory area, we didn't boot before, so
-	 * this is not a resume. In that case we just create the cbmem toc.
-	 */
-
-	*(u32 *)CBMEM_BOOT_MODE = 0;
-	*(u32 *)CBMEM_RESUME_BACKUP = 0;
-
-	if (s3resume) {
-		void *resume_backup_memory = cbmem_find(CBMEM_ID_RESUME);
-		if (resume_backup_memory) {
-			*(u32 *)CBMEM_BOOT_MODE = 2;
-			*(u32 *)CBMEM_RESUME_BACKUP = (u32)resume_backup_memory;
-		}
-		/* Magic for S3 resume */
-		pci_write_config32(PCI_DEV(0, 0x00, 0), SKPAD, 0xcafed00d);
-	} else {
-		pci_write_config32(PCI_DEV(0, 0x00, 0), SKPAD, 0xcafebabe);
-	}
-#endif
 	post_code(0x3f);
 	timestamp_add_now(TS_END_ROMSTAGE);
 }
diff --git a/src/mainboard/lenovo/x230/romstage.c b/src/mainboard/lenovo/x230/romstage.c
index 94fa5cf9a2..1a96ab25e4 100644
--- a/src/mainboard/lenovo/x230/romstage.c
+++ b/src/mainboard/lenovo/x230/romstage.c
@@ -229,28 +229,8 @@ void main(unsigned long bist)
 	rcba_config();
 	post_code(0x3d);
 
-	MCHBAR16(SSKPD) = 0xCAFE;
+	northbridge_romstage_finalize(s3resume);
 
-#if CONFIG_HAVE_ACPI_RESUME
-	/* If there is no high memory area, we didn't boot before, so
-	 * this is not a resume. In that case we just create the cbmem toc.
-	 */
-
-	*(u32 *)CBMEM_BOOT_MODE = 0;
-	*(u32 *)CBMEM_RESUME_BACKUP = 0;
-
-	if (s3resume) {
-		void *resume_backup_memory = cbmem_find(CBMEM_ID_RESUME);
-		if (resume_backup_memory) {
-			*(u32 *)CBMEM_BOOT_MODE = 2;
-			*(u32 *)CBMEM_RESUME_BACKUP = (u32)resume_backup_memory;
-		}
-		/* Magic for S3 resume */
-		pci_write_config32(PCI_DEV(0, 0x00, 0), SKPAD, 0xcafed00d);
-	} else {
-		pci_write_config32(PCI_DEV(0, 0x00, 0), SKPAD, 0xcafebabe);
-	}
-#endif
 	post_code(0x3f);
 	timestamp_add_now(TS_END_ROMSTAGE);
 }
diff --git a/src/mainboard/samsung/lumpy/romstage.c b/src/mainboard/samsung/lumpy/romstage.c
index 32f1ec5fcd..20fcaee39c 100644
--- a/src/mainboard/samsung/lumpy/romstage.c
+++ b/src/mainboard/samsung/lumpy/romstage.c
@@ -316,36 +316,16 @@ void main(unsigned long bist)
 	quick_ram_check();
 	post_code(0x3e);
 
-	MCHBAR16(SSKPD) = 0xCAFE;
-
 	cbmem_was_initted = !cbmem_recovery(boot_mode==2);
 	if (boot_mode!=2)
 		save_mrc_data(&pei_data);
 
-#if CONFIG_HAVE_ACPI_RESUME
-	/* If there is no high memory area, we didn't boot before, so
-	 * this is not a resume. In that case we just create the cbmem toc.
-	 */
-
-	*(u32 *)CBMEM_BOOT_MODE = 0;
-	*(u32 *)CBMEM_RESUME_BACKUP = 0;
-
-	if ((boot_mode == 2) && cbmem_was_initted) {
-		void *resume_backup_memory = cbmem_find(CBMEM_ID_RESUME);
-		if (resume_backup_memory) {
-			*(u32 *)CBMEM_BOOT_MODE = boot_mode;
-			*(u32 *)CBMEM_RESUME_BACKUP = (u32)resume_backup_memory;
-		}
-		/* Magic for S3 resume */
-		pci_write_config32(PCI_DEV(0, 0x00, 0), SKPAD, 0xcafed00d);
-	} else if (boot_mode == 2) {
+	if (boot_mode == 2 && !cbmem_was_initted) {
 		/* Failed S3 resume, reset to come up cleanly */
 		outb(0x6, 0xcf9);
 		hlt();
-	} else {
-		pci_write_config32(PCI_DEV(0, 0x00, 0), SKPAD, 0xcafebabe);
 	}
-#endif
+	northbridge_romstage_finalize(boot_mode==2);
 	post_code(0x3f);
 #if CONFIG_CHROMEOS
 	init_chromeos(boot_mode);
diff --git a/src/mainboard/samsung/stumpy/romstage.c b/src/mainboard/samsung/stumpy/romstage.c
index a3905aba90..2166d6e4f4 100644
--- a/src/mainboard/samsung/stumpy/romstage.c
+++ b/src/mainboard/samsung/stumpy/romstage.c
@@ -327,35 +327,17 @@ void main(unsigned long bist)
 	quick_ram_check();
 	post_code(0x3e);
 
-	MCHBAR16(SSKPD) = 0xCAFE;
 	cbmem_was_initted = !cbmem_recovery(boot_mode==2);
 	if (boot_mode!=2)
 		save_mrc_data(&pei_data);
 
-#if CONFIG_HAVE_ACPI_RESUME
-	/* If there is no high memory area, we didn't boot before, so
-	 * this is not a resume. In that case we just create the cbmem toc.
-	 */
-
-	*(u32 *)CBMEM_BOOT_MODE = 0;
-	*(u32 *)CBMEM_RESUME_BACKUP = 0;
-
-	if ((boot_mode == 2) && cbmem_was_initted) {
-		void *resume_backup_memory = cbmem_find(CBMEM_ID_RESUME);
-		if (resume_backup_memory) {
-			*(u32 *)CBMEM_BOOT_MODE = boot_mode;
-			*(u32 *)CBMEM_RESUME_BACKUP = (u32)resume_backup_memory;
-		}
-		/* Magic for S3 resume */
-		pci_write_config32(PCI_DEV(0, 0x00, 0), SKPAD, 0xcafed00d);
-	} else if (boot_mode == 2) {
+	if (boot_mode==2 && !cbmem_was_initted) {
 		/* Failed S3 resume, reset to come up cleanly */
 		outb(0x6, 0xcf9);
 		hlt();
-	} else {
-		pci_write_config32(PCI_DEV(0, 0x00, 0), SKPAD, 0xcafebabe);
 	}
-#endif
+	northbridge_romstage_finalize(boot_mode==2);
+
 	post_code(0x3f);
 #if CONFIG_CHROMEOS
 	init_chromeos(boot_mode);
diff --git a/src/northbridge/intel/sandybridge/early_init.c b/src/northbridge/intel/sandybridge/early_init.c
index d1d35dbab2..8bf44c1745 100644
--- a/src/northbridge/intel/sandybridge/early_init.c
+++ b/src/northbridge/intel/sandybridge/early_init.c
@@ -24,6 +24,7 @@
 #include <arch/io.h>
 #include <device/pci_def.h>
 #include <elog.h>
+#include <cbmem.h>
 #include <pc80/mc146818rtc.h>
 #include "sandybridge.h"
 
@@ -174,3 +175,29 @@ void sandybridge_early_initialization(int chipset_type)
 
 	sandybridge_setup_graphics();
 }
+
+void northbridge_romstage_finalize(int s3resume)
+{
+	MCHBAR16(SSKPD) = 0xCAFE;
+
+#if CONFIG_HAVE_ACPI_RESUME
+	/* If there is no high memory area, we didn't boot before, so
+	 * this is not a resume. In that case we just create the cbmem toc.
+	 */
+
+	*(u32 *)CBMEM_BOOT_MODE = 0;
+	*(u32 *)CBMEM_RESUME_BACKUP = 0;
+
+	if (s3resume) {
+		void *resume_backup_memory = cbmem_find(CBMEM_ID_RESUME);
+		if (resume_backup_memory) {
+			*(u32 *)CBMEM_BOOT_MODE = 2;
+			*(u32 *)CBMEM_RESUME_BACKUP = (u32)resume_backup_memory;
+		}
+		/* Magic for S3 resume */
+		pci_write_config32(PCI_DEV(0, 0x00, 0), SKPAD, 0xcafed00d);
+	} else {
+		pci_write_config32(PCI_DEV(0, 0x00, 0), SKPAD, 0xcafebabe);
+	}
+#endif
+}
diff --git a/src/northbridge/intel/sandybridge/sandybridge.h b/src/northbridge/intel/sandybridge/sandybridge.h
index 291ea46d8b..d38bf0bdc9 100644
--- a/src/northbridge/intel/sandybridge/sandybridge.h
+++ b/src/northbridge/intel/sandybridge/sandybridge.h
@@ -209,6 +209,7 @@ void intel_sandybridge_finalize_smm(void);
 int bridge_silicon_revision(void);
 void sandybridge_early_initialization(int chipset_type);
 void sandybridge_late_initialization(void);
+void northbridge_romstage_finalize(int s3resume);
 
 /* debugging functions */
 void print_pci_devices(void);