northbridge/intel/x4x: Intel 4-series northbridge support

Boots to console on Gigabyte GA-G41M-ES2L

Ram initialization *not* included in this patch
VGA native init works on analog connector

Change-Id: I5262f73fd03d5e5c12e9f11d027bdfbbf0ddde82
Signed-off-by: Damien Zammit <damien@zamaudio.com>
Reviewed-on: https://review.coreboot.org/11305
Tested-by: build bot (Jenkins)
Reviewed-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>

14 files changed, 1520 insertions, 0 deletions

diff --git a/src/northbridge/intel/x4x/Kconfig b/src/northbridge/intel/x4x/Kconfig
new file mode 100644
index 0000000000..c330fd50d5
--- /dev/null
+++ b/src/northbridge/intel/x4x/Kconfig
@@ -0,0 +1,39 @@
+##
+## This file is part of the coreboot project.
+##
+## Copyright (C) 2007-2009 coresystems GmbH
+## Copyright (C) 2015 Damien Zammit <damien@zamaudio.com>
+##
+## This program is free software; you can redistribute it and/or modify
+## it under the terms of the GNU General Public License as published by
+## the Free Software Foundation; version 2 of the License.
+##
+## This program is distributed in the hope that it will be useful,
+## but WITHOUT ANY WARRANTY; without even the implied warranty of
+## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+## GNU General Public License for more details.
+##
+
+config NORTHBRIDGE_INTEL_X4X
+	bool
+
+if NORTHBRIDGE_INTEL_X4X
+
+config NORTHBRIDGE_SPECIFIC_OPTIONS # dummy
+	def_bool y
+	select HAVE_DEBUG_RAM_SETUP
+	select MMCONF_SUPPORT
+	select MMCONF_SUPPORT_DEFAULT
+	select VGA
+	select INTEL_GMA_ACPI
+	select LATE_CBMEM_INIT
+
+config BOOTBLOCK_NORTHBRIDGE_INIT
+	string
+	default "northbridge/intel/x4x/bootblock.c"
+
+config VGA_BIOS_ID
+	string
+	default "8086,2e32"
+
+endif
diff --git a/src/northbridge/intel/x4x/Makefile.inc b/src/northbridge/intel/x4x/Makefile.inc
new file mode 100644
index 0000000000..8d1247e3a9
--- /dev/null
+++ b/src/northbridge/intel/x4x/Makefile.inc
@@ -0,0 +1,27 @@
+#
+# This file is part of the coreboot project.
+#
+# Copyright (C) 2012 secunet Security Networks AG
+# Copyright (C) 2015 Damien Zammit <damien@zamaudio.com>
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; version 2 of the License.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+
+ifeq ($(CONFIG_NORTHBRIDGE_INTEL_X4X),y)
+
+romstage-y += early_init.c
+romstage-y += ram_calc.c
+
+ramstage-y += acpi.c
+ramstage-y += ram_calc.c
+ramstage-y += gma.c
+ramstage-y += northbridge.c
+
+endif
diff --git a/src/northbridge/intel/x4x/acpi.c b/src/northbridge/intel/x4x/acpi.c
new file mode 100644
index 0000000000..386096c172
--- /dev/null
+++ b/src/northbridge/intel/x4x/acpi.c
@@ -0,0 +1,57 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2007-2009 coresystems GmbH
+ * Copyright (C) 2015 Damien Zammit <damien@zamaudio.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; version 2 of
+ * the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <types.h>
+#include <string.h>
+#include <console/console.h>
+#include <arch/acpi.h>
+#include <arch/acpigen.h>
+#include <device/device.h>
+#include <device/pci.h>
+#include <device/pci_ids.h>
+#include <cbmem.h>
+#include <arch/acpigen.h>
+#include <cpu/cpu.h>
+#include "x4x.h"
+
+unsigned long acpi_fill_mcfg(unsigned long current)
+{
+	device_t dev;
+	u32 pciexbar = 0;
+	u32 length = 0;
+
+	dev = dev_find_slot(0, PCI_DEVFN(0,0));
+	if (!decode_pciebar(&pciexbar, &length))
+		return current;
+
+	current += acpi_create_mcfg_mmconfig((acpi_mcfg_mmconfig_t *) current,
+			pciexbar, 0x0, 0x0, (length >> 20) - 1);
+
+	return current;
+}
+
+unsigned long northbridge_write_acpi_tables(device_t device,
+					    unsigned long start,
+					    struct acpi_rsdp *rsdp)
+{
+	unsigned long current;
+	current = acpi_align_current(start);
+
+	printk(BIOS_DEBUG, "current = %lx\n", current);
+
+	return current;
+}
diff --git a/src/northbridge/intel/x4x/acpi/hostbridge.asl b/src/northbridge/intel/x4x/acpi/hostbridge.asl
new file mode 100644
index 0000000000..530fdfafd9
--- /dev/null
+++ b/src/northbridge/intel/x4x/acpi/hostbridge.asl
@@ -0,0 +1,234 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2007-2009 coresystems GmbH
+ * Copyright (C) 2015 Damien Zammit <damien@zamaudio.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; version 2 of
+ * the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <arch/ioapic.h>
+
+Name(_HID,EISAID("PNP0A08"))	// PCIe
+Name(_CID,EISAID("PNP0A03"))	// PCI
+
+Name(_ADR, 0)
+Name(_BBN, 0)
+
+Device (MCHC)
+{
+	Name(_ADR, 0x00000000)	// 0:0.0
+
+	OperationRegion(MCHP, PCI_Config, 0x00, 0x100)
+	Field (MCHP, DWordAcc, NoLock, Preserve)
+	{
+		Offset (0x40),	// EPBAR
+		EPEN,	 1,	// Enable
+		,	11,	//
+		EPBR,	24,	// EPBAR
+
+		Offset (0x48),	// MCHBAR
+		MHEN,	 1,	// Enable
+		,	13,	//
+		MHBR,	22,	// MCHBAR
+
+		Offset (0x60),	// PCIe BAR
+		PXEN,	 1,	// Enable
+		PXSZ,	 2,	// BAR size
+		,	23,	//
+		PXBR,	10,	// PCIe BAR
+
+		Offset (0x68),	// DMIBAR
+		DMEN,	 1,	// Enable
+		,	11,	//
+		DMBR,	24,	// DMIBAR
+
+		// ...
+
+		Offset (0x90),	// PAM0
+		,	 4,
+		PM0H,	 2,
+		,	 2,
+		Offset (0x91),	// PAM1
+		PM1L,	 2,
+		,	 2,
+		PM1H,	 2,
+		,	 2,
+		Offset (0x92),	// PAM2
+		PM2L,	 2,
+		,	 2,
+		PM2H,	 2,
+		,	 2,
+		Offset (0x93),	// PAM3
+		PM3L,	 2,
+		,	 2,
+		PM3H,	 2,
+		,	 2,
+		Offset (0x94),	// PAM4
+		PM4L,	 2,
+		,	 2,
+		PM4H,	 2,
+		,	 2,
+		Offset (0x95),	// PAM5
+		PM5L,	 2,
+		,	 2,
+		PM5H,	 2,
+		,	 2,
+		Offset (0x96),	// PAM6
+		PM6L,	 2,
+		,	 2,
+		PM6H,	 2,
+		,	 2,
+
+		Offset (0xa0),	// Top of Used Memory
+		TOM,	 8,
+
+		Offset (0xb0),	// Top of Low Used Memory
+		,	 4,
+		TLUD,	12,
+	}
+
+}
+
+Name (MCRS, ResourceTemplate()
+{
+	// Bus Numbers
+	WordBusNumber (ResourceProducer, MinFixed, MaxFixed, PosDecode,
+			0x0000, 0x0000, 0x00ff, 0x0000, 0x0100,,, PB00)
+
+	// IO Region 0
+	DWordIO (ResourceProducer, MinFixed, MaxFixed, PosDecode, EntireRange,
+			0x0000, 0x0000, 0x0cf7, 0x0000, 0x0cf8,,, PI00)
+
+	// PCI Config Space
+	Io (Decode16, 0x0cf8, 0x0cf8, 0x0001, 0x0008)
+
+	// IO Region 1
+	DWordIO (ResourceProducer, MinFixed, MaxFixed, PosDecode, EntireRange,
+			0x0000, 0x0d00, 0xffff, 0x0000, 0xf300,,, PI01)
+
+	// VGA memory (0xa0000-0xbffff)
+	DWordMemory (ResourceProducer, PosDecode, MinFixed, MaxFixed,
+			Cacheable, ReadWrite,
+			0x00000000, 0x000a0000, 0x000bffff, 0x00000000,
+			0x00020000,,, ASEG)
+
+	// OPROM reserved (0xc0000-0xc3fff)
+	DWordMemory (ResourceProducer, PosDecode, MinFixed, MaxFixed,
+			Cacheable, ReadWrite,
+			0x00000000, 0x000c0000, 0x000c3fff, 0x00000000,
+			0x00004000,,, OPR0)
+
+	// OPROM reserved (0xc4000-0xc7fff)
+	DWordMemory (ResourceProducer, PosDecode, MinFixed, MaxFixed,
+			Cacheable, ReadWrite,
+			0x00000000, 0x000c4000, 0x000c7fff, 0x00000000,
+			0x00004000,,, OPR1)
+
+	// OPROM reserved (0xc8000-0xcbfff)
+	DWordMemory (ResourceProducer, PosDecode, MinFixed, MaxFixed,
+			Cacheable, ReadWrite,
+			0x00000000, 0x000c8000, 0x000cbfff, 0x00000000,
+			0x00004000,,, OPR2)
+
+	// OPROM reserved (0xcc000-0xcffff)
+	DWordMemory (ResourceProducer, PosDecode, MinFixed, MaxFixed,
+			Cacheable, ReadWrite,
+			0x00000000, 0x000cc000, 0x000cffff, 0x00000000,
+			0x00004000,,, OPR3)
+
+	// OPROM reserved (0xd0000-0xd3fff)
+	DWordMemory (ResourceProducer, PosDecode, MinFixed, MaxFixed,
+			Cacheable, ReadWrite,
+			0x00000000, 0x000d0000, 0x000d3fff, 0x00000000,
+			0x00004000,,, OPR4)
+
+	// OPROM reserved (0xd4000-0xd7fff)
+	DWordMemory (ResourceProducer, PosDecode, MinFixed, MaxFixed,
+			Cacheable, ReadWrite,
+			0x00000000, 0x000d4000, 0x000d7fff, 0x00000000,
+			0x00004000,,, OPR5)
+
+	// OPROM reserved (0xd8000-0xdbfff)
+	DWordMemory (ResourceProducer, PosDecode, MinFixed, MaxFixed,
+			Cacheable, ReadWrite,
+			0x00000000, 0x000d8000, 0x000dbfff, 0x00000000,
+			0x00004000,,, OPR6)
+
+	// OPROM reserved (0xdc000-0xdffff)
+	DWordMemory (ResourceProducer, PosDecode, MinFixed, MaxFixed,
+			Cacheable, ReadWrite,
+			0x00000000, 0x000dc000, 0x000dffff, 0x00000000,
+			0x00004000,,, OPR7)
+
+	// BIOS Extension (0xe0000-0xe3fff)
+	DWordMemory (ResourceProducer, PosDecode, MinFixed, MaxFixed,
+			Cacheable, ReadWrite,
+			0x00000000, 0x000e0000, 0x000e3fff, 0x00000000,
+			0x00004000,,, ESG0)
+
+	// BIOS Extension (0xe4000-0xe7fff)
+	DWordMemory (ResourceProducer, PosDecode, MinFixed, MaxFixed,
+			Cacheable, ReadWrite,
+			0x00000000, 0x000e4000, 0x000e7fff, 0x00000000,
+			0x00004000,,, ESG1)
+
+	// BIOS Extension (0xe8000-0xebfff)
+	DWordMemory (ResourceProducer, PosDecode, MinFixed, MaxFixed,
+			Cacheable, ReadWrite,
+			0x00000000, 0x000e8000, 0x000ebfff, 0x00000000,
+			0x00004000,,, ESG2)
+
+	// BIOS Extension (0xec000-0xeffff)
+	DWordMemory (ResourceProducer, PosDecode, MinFixed, MaxFixed,
+			Cacheable, ReadWrite,
+			0x00000000, 0x000ec000, 0x000effff, 0x00000000,
+			0x00004000,,, ESG3)
+
+	// System BIOS (0xf0000-0xfffff)
+	DWordMemory (ResourceProducer, PosDecode, MinFixed, MaxFixed,
+			Cacheable, ReadWrite,
+			0x00000000, 0x000f0000, 0x000fffff, 0x00000000,
+			0x00010000,,, FSEG)
+
+	// PCI Memory Region (Top of memory-0xfebfffff)
+	DWordMemory (ResourceProducer, PosDecode, MinFixed, MaxFixed,
+			Cacheable, ReadWrite,
+			0x00000000, 0x00000000, 0xfebfffff, 0x00000000,
+			IO_APIC_ADDR,,, PM01)
+
+	// TPM Area (0xfed40000-0xfed44fff)
+	DWordMemory (ResourceProducer, PosDecode, MinFixed, MaxFixed,
+			Cacheable, ReadWrite,
+			0x00000000, 0xfed40000, 0xfed44fff, 0x00000000,
+			0x00005000,,, TPMR)
+})
+
+// Current Resource Settings
+
+Method (_CRS, 0, Serialized)
+{
+	// Find PCI resource area in MCRS
+	CreateDwordField(MCRS, ^PM01._MIN, PMIN)
+	CreateDwordField(MCRS, ^PM01._MAX, PMAX)
+	CreateDwordField(MCRS, ^PM01._LEN, PLEN)
+
+	// Fix up PCI memory region:
+	// Enter actual TOLUD. The TOLUD register contains bits 20-31 of
+	// the top of memory address.
+	ShiftLeft (^MCHC.TLUD, 20, PMIN)
+	Add(Subtract(PMAX, PMIN), 1, PLEN)
+
+	Return (MCRS)
+}
+
+/* IRQ assignment is mainboard specific. Get it from mainboard ACPI code */
+#include "acpi/x4x_pci_irqs.asl"
diff --git a/src/northbridge/intel/x4x/acpi/peg.asl b/src/northbridge/intel/x4x/acpi/peg.asl
new file mode 100644
index 0000000000..f2314c24d0
--- /dev/null
+++ b/src/northbridge/intel/x4x/acpi/peg.asl
@@ -0,0 +1,42 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2007-2009 coresystems GmbH
+ * Copyright (C) 2015 Damien Zammit <damien@zamaudio.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; version 2 of
+ * the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+Device (PEGP)
+{
+	Name (_ADR, 0x00010000)
+
+	// PCI Interrupt Routing.
+	Method (_PRT)
+	{
+		If (PICM) {
+			Return (Package() {
+				Package() { 0x0001ffff, 0, 0, 16 },
+				Package() { 0x0001ffff, 1, 0, 17 },
+				Package() { 0x0001ffff, 2, 0, 18 },
+				Package() { 0x0001ffff, 3, 0, 19 },
+			})
+		} Else {
+			Return (Package() {
+				Package() { 0x0001ffff, 0, \_SB.PCI0.LPCB.LNKA, 0 },
+				Package() { 0x0001ffff, 1, \_SB.PCI0.LPCB.LNKB, 0 },
+				Package() { 0x0001ffff, 2, \_SB.PCI0.LPCB.LNKC, 0 },
+				Package() { 0x0001ffff, 3, \_SB.PCI0.LPCB.LNKD, 0 },
+			})
+		}
+
+	}
+}
diff --git a/src/northbridge/intel/x4x/acpi/x4x.asl b/src/northbridge/intel/x4x/acpi/x4x.asl
new file mode 100644
index 0000000000..7724d8ee0f
--- /dev/null
+++ b/src/northbridge/intel/x4x/acpi/x4x.asl
@@ -0,0 +1,49 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2007-2009 coresystems GmbH
+ * Copyright (C) 2015 Damien Zammit <damien@zamaudio.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; version 2 of
+ * the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include "hostbridge.asl"
+#include "../iomap.h"
+
+/* PCI Device Resource Consumption */
+Device (PDRC)
+{
+	Name (_HID, EISAID("PNP0C02"))
+	Name (_UID, 1)
+
+	Name (PDRS, ResourceTemplate() {
+		Memory32Fixed(ReadWrite, 0xfed1c000, 0x00004000) // RCBA
+		Memory32Fixed(ReadWrite, DEFAULT_MCHBAR,   0x00004000)
+		Memory32Fixed(ReadWrite, DEFAULT_DMIBAR,   0x00001000)
+		Memory32Fixed(ReadWrite, DEFAULT_EPBAR,    0x00001000)
+		Memory32Fixed(ReadWrite, DEFAULT_PCIEXBAR, 0x04000000)
+		Memory32Fixed(ReadWrite, 0xfed20000, 0x00020000) // Misc ICH
+		Memory32Fixed(ReadWrite, 0xfed40000, 0x00005000) // Misc ICH
+		Memory32Fixed(ReadWrite, 0xfed45000, 0x0004b000) // Misc ICH
+	})
+
+	// Current Resource Settings
+	Method (_CRS, 0, Serialized)
+	{
+		Return(PDRS)
+	}
+}
+
+// PCIe graphics port 0:1.0
+#include "peg.asl"
+
+// Integrated graphics 0:2.0
+#include <drivers/intel/gma/acpi/non-pch.asl>
diff --git a/src/northbridge/intel/x4x/bootblock.c b/src/northbridge/intel/x4x/bootblock.c
new file mode 100644
index 0000000000..0a8946c5ec
--- /dev/null
+++ b/src/northbridge/intel/x4x/bootblock.c
@@ -0,0 +1,32 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2015  Damien Zammit <damien@zamaudio.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <arch/io.h>
+
+#define D0F0_PCIEXBAR_LO 0x60
+#define TPMBASE 0xfed40000
+#define TPM32(x) *((volatile u32 *)(TPMBASE + x))
+
+static void bootblock_northbridge_init(void)
+{
+	uint32_t reg32;
+
+	/* Disable LaGrande Technology (LT) */
+	reg32 = TPM32(0);
+
+	reg32 = CONFIG_MMCONF_BASE_ADDRESS | 16 | 1;
+	pci_io_write_config32(PCI_DEV(0,0,0), D0F0_PCIEXBAR_LO, reg32);
+}
diff --git a/src/northbridge/intel/x4x/chip.h b/src/northbridge/intel/x4x/chip.h
new file mode 100644
index 0000000000..1fb54ccf86
--- /dev/null
+++ b/src/northbridge/intel/x4x/chip.h
@@ -0,0 +1,26 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2015  Damien Zammit <damien@zamaudio.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#ifndef NORTHBRIDGE_INTEL_X4X_CHIP_H
+#define NORTHBRIDGE_INTEL_X4X_CHIP_H
+
+#include <drivers/intel/gma/i915.h>
+
+struct northbridge_intel_x4x_config {
+	struct i915_gpu_controller_info gfx;
+};
+
+#endif
diff --git a/src/northbridge/intel/x4x/early_init.c b/src/northbridge/intel/x4x/early_init.c
new file mode 100644
index 0000000000..1d43e0aca5
--- /dev/null
+++ b/src/northbridge/intel/x4x/early_init.c
@@ -0,0 +1,58 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2012 secunet Security Networks AG
+ * Copyright (C) 2015 Damien Zammit <damien@zamaudio.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <stdint.h>
+#include <arch/io.h>
+#include "x4x.h"
+
+void x4x_early_init(void)
+{
+	u16 reg16;
+
+	const device_t d0f0 = PCI_DEV(0, 0, 0);
+
+	/* Setup MCHBAR. */
+	pci_write_config32(d0f0, D0F0_MCHBAR_LO, (uintptr_t)DEFAULT_MCHBAR | 1);
+
+	/* Setup DMIBAR. */
+	pci_write_config32(d0f0, D0F0_DMIBAR_LO, (uintptr_t)DEFAULT_DMIBAR | 1);
+
+	/* Setup EPBAR. */
+	pci_write_config32(d0f0, D0F0_EPBAR_LO, DEFAULT_EPBAR | 1);
+
+	/* Setup PMBASE */
+	pci_write_config32(d0f0, D0F0_PMBASE, DEFAULT_PMBASE | 1);
+
+	/* Setup HECIBAR */
+	pci_write_config32(PCI_DEV(0,3,0), 0x10, DEFAULT_HECIBAR);
+	reg16 = pci_read_config16(PCI_DEV(0,3,0), 0x4);
+	pci_write_config16(PCI_DEV(0,3,0), 0x4, reg16 | 0x6);
+
+	/* Set C0000-FFFFF to access RAM on both reads and writes */
+	pci_write_config8(d0f0, D0F0_PAM(0), 0x30);
+	pci_write_config8(d0f0, D0F0_PAM(1), 0x33);
+	pci_write_config8(d0f0, D0F0_PAM(2), 0x33);
+	pci_write_config8(d0f0, D0F0_PAM(3), 0x33);
+	pci_write_config8(d0f0, D0F0_PAM(4), 0x33);
+	pci_write_config8(d0f0, D0F0_PAM(5), 0x33);
+	pci_write_config8(d0f0, D0F0_PAM(6), 0x33);
+
+	/* Enable internal GFX */
+	pci_write_config16(d0f0, D0F0_GGC, 0x0170);
+
+	reg16 = pci_read_config16(d0f0, D0F0_DEVEN);
+	pci_write_config16(d0f0, D0F0_DEVEN, reg16 | 0x8);
+}
diff --git a/src/northbridge/intel/x4x/gma.c b/src/northbridge/intel/x4x/gma.c
new file mode 100644
index 0000000000..7891229392
--- /dev/null
+++ b/src/northbridge/intel/x4x/gma.c
@@ -0,0 +1,286 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2011 Chromium OS Authors
+ * Copyright (C) 2013 Vladimir Serbinenko
+ * Copyright (C) 2015 Damien Zammit <damien@zamaudio.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <arch/io.h>
+#include <console/console.h>
+#include <delay.h>
+#include <device/device.h>
+#include <device/pci.h>
+#include <device/pci_ids.h>
+#include <string.h>
+#include <device/pci_ops.h>
+#include <cpu/x86/msr.h>
+#include <cpu/x86/mtrr.h>
+#include <kconfig.h>
+
+#include "drivers/intel/gma/i915_reg.h"
+#include "chip.h"
+#include "x4x.h"
+#include <drivers/intel/gma/intel_bios.h>
+#include <drivers/intel/gma/i915.h>
+#include <pc80/vga.h>
+#include <pc80/vga_io.h>
+
+static struct resource *gtt_res = NULL;
+
+void gtt_write(u32 reg, u32 data)
+{
+	write32(res2mmio(gtt_res, reg, 0), data);
+}
+
+static void intel_gma_init(const struct northbridge_intel_x4x_config *info,
+			   u8 *mmio, u32 physbase, u16 piobase, u32 lfb)
+{
+
+	int i;
+	u32 hactive, vactive;
+	vga_gr_write(0x18, 0);
+
+	/* Setup GTT.  */
+	for (i = 0; i < 0x2000; i++)
+	{
+		outl((i << 2) | 1, piobase);
+		outl(physbase + (i << 12) + 1, piobase + 4);
+	}
+
+	write32(mmio + VGA0, 0x31108);
+	write32(mmio + VGA1, 0x31406);
+
+	write32(mmio + ADPA, ADPA_DAC_ENABLE
+			| ADPA_PIPE_A_SELECT
+			| ADPA_CRT_HOTPLUG_MONITOR_COLOR
+			| ADPA_CRT_HOTPLUG_ENABLE
+			| ADPA_USE_VGA_HVPOLARITY
+			| ADPA_VSYNC_CNTL_ENABLE
+			| ADPA_HSYNC_CNTL_ENABLE
+			| ADPA_DPMS_ON
+			);
+
+	write32(mmio + 0x7041c, 0x0);
+	write32(mmio + DPLL_MD(0), 0x3);
+	write32(mmio + DPLL_MD(1), 0x3);
+
+	vga_misc_write(0x67);
+
+	const u8 cr[] = { 0x5f, 0x4f, 0x50, 0x82, 0x55, 0x81, 0xbf, 0x1f,
+		    0x00, 0x4f, 0x0d, 0x0e, 0x00, 0x00, 0x00, 0x00,
+		    0x9c, 0x8e, 0x8f, 0x28, 0x1f, 0x96, 0xb9, 0xa3,
+		    0xff
+	};
+	vga_cr_write(0x11, 0);
+
+	for (i = 0; i <= 0x18; i++)
+		vga_cr_write(i, cr[i]);
+
+	/* Disable screen memory to prevent garbage from appearing.  */
+	vga_sr_write(1, vga_sr_read(1) | 0x20);
+
+	hactive = 640;
+	vactive = 400;
+
+	vga_textmode_init();
+
+	mdelay(1);
+	write32(mmio + FP0(0), 0x31108);
+	write32(mmio + DPLL(0),
+		DPLL_VCO_ENABLE | DPLLB_MODE_DAC_SERIAL
+		| DPLL_DAC_SERIAL_P2_CLOCK_DIV_10
+		| 0x10601
+		);
+	mdelay(1);
+	write32(mmio + DPLL(0),
+		DPLL_VCO_ENABLE | DPLLB_MODE_DAC_SERIAL
+		| DPLL_DAC_SERIAL_P2_CLOCK_DIV_10
+		| 0x10601
+		);
+
+	write32(mmio + ADPA, ADPA_DAC_ENABLE
+			| ADPA_PIPE_A_SELECT
+			| ADPA_CRT_HOTPLUG_MONITOR_COLOR
+			| ADPA_CRT_HOTPLUG_ENABLE
+			| ADPA_USE_VGA_HVPOLARITY
+			| ADPA_VSYNC_CNTL_ENABLE
+			| ADPA_HSYNC_CNTL_ENABLE
+			| ADPA_DPMS_ON
+			);
+
+	write32(mmio + HTOTAL(0),
+		((hactive - 1) << 16)
+		| (hactive - 1));
+	write32(mmio + HBLANK(0),
+		((hactive - 1) << 16)
+		| (hactive - 1));
+	write32(mmio + HSYNC(0),
+		((hactive - 1) << 16)
+		| (hactive - 1));
+
+	write32(mmio + VTOTAL(0), ((vactive - 1) << 16)
+		| (vactive - 1));
+	write32(mmio + VBLANK(0), ((vactive - 1) << 16)
+		| (vactive - 1));
+	write32(mmio + VSYNC(0),
+		((vactive - 1) << 16)
+		| (vactive - 1));
+
+	write32(mmio + PIPECONF(0), PIPECONF_DISABLE);
+
+	write32(mmio + PF_WIN_POS(0), 0);
+
+	write32(mmio + PIPESRC(0), (639 << 16) | 399);
+	write32(mmio + PF_CTL(0),PF_ENABLE | PF_FILTER_MED_3x3);
+	write32(mmio + PF_WIN_SZ(0), vactive | (hactive << 16));
+	write32(mmio + PFIT_CONTROL, 0xa0000000);
+
+	mdelay(1);
+
+	write32(mmio + 0x000f000c, 0x00002040);
+	mdelay(1);
+	write32(mmio + 0x000f000c, 0x00002050);
+	write32(mmio + 0x00060100, 0x00044000);
+	mdelay(1);
+	write32(mmio + PIPECONF(0), PIPECONF_ENABLE | PIPECONF_BPP_6 | PIPECONF_DITHER_EN);
+
+	write32(mmio + VGACNTRL, 0x0);
+	write32(mmio + DSPCNTR(0), DISPLAY_PLANE_ENABLE | DISPPLANE_BGRX888);
+	mdelay(1);
+
+	write32(mmio + ADPA, ADPA_DAC_ENABLE
+			| ADPA_PIPE_A_SELECT
+			| ADPA_CRT_HOTPLUG_MONITOR_COLOR
+			| ADPA_CRT_HOTPLUG_ENABLE
+			| ADPA_USE_VGA_HVPOLARITY
+			| ADPA_VSYNC_CNTL_ENABLE
+			| ADPA_HSYNC_CNTL_ENABLE
+			| ADPA_DPMS_ON
+			);
+
+	write32(mmio + PP_CONTROL, PANEL_POWER_ON);
+
+	/* Enable screen memory.  */
+	vga_sr_write(1, vga_sr_read(1) & ~0x20);
+
+	/* Clear interrupts. */
+	write32(mmio + DEIIR, 0xffffffff);
+	write32(mmio + SDEIIR, 0xffffffff);
+}
+
+static void gma_func0_init(struct device *dev)
+{
+	u32 reg32;
+
+	/* IGD needs to be Bus Master */
+	reg32 = pci_read_config32(dev, PCI_COMMAND);
+	reg32 |= PCI_COMMAND_MASTER | PCI_COMMAND_MEMORY | PCI_COMMAND_IO;
+	pci_write_config32(dev, PCI_COMMAND, reg32);
+
+	/* Init graphics power management */
+	gtt_res = find_resource(dev, PCI_BASE_ADDRESS_0);
+
+	struct northbridge_intel_x4x_config *conf = dev->chip_info;
+
+	if (!IS_ENABLED(CONFIG_MAINBOARD_DO_NATIVE_VGA_INIT)) {
+		/* PCI Init, will run VBIOS */
+		pci_dev_init(dev);
+	} else {
+		u32 physbase;
+		struct resource *lfb_res;
+		struct resource *pio_res;
+
+		lfb_res = find_resource(dev, PCI_BASE_ADDRESS_2);
+		pio_res = find_resource(dev, PCI_BASE_ADDRESS_4);
+
+		physbase = pci_read_config32(dev, 0x5c) & ~0xf;
+
+		if (gtt_res && gtt_res->base && physbase && pio_res && pio_res->base
+		    && lfb_res && lfb_res->base) {
+			printk(BIOS_SPEW, "Initializing VGA without OPROM. MMIO 0x%llx\n",
+			       gtt_res->base);
+			intel_gma_init(conf, res2mmio(gtt_res, 0, 0), physbase,
+				       pio_res->base, lfb_res->base);
+		}
+
+		/* Linux relies on VBT for panel info.  */
+		generate_fake_intel_oprom(&conf->gfx, dev, "$VBT EAGLELAKE      ");
+	}
+
+	/* Post VBIOS init */
+	/* Enable Backlight  */
+	gtt_write(BLC_PWM_CTL2, (1 << 31));
+	if (conf->gfx.backlight == 0)
+		gtt_write(BLC_PWM_CTL, 0x06100610);
+	else
+		gtt_write(BLC_PWM_CTL, conf->gfx.backlight);
+}
+
+static void gma_set_subsystem(device_t dev, unsigned vendor, unsigned device)
+{
+	if (!vendor || !device) {
+		pci_write_config32(dev, PCI_SUBSYSTEM_VENDOR_ID,
+				   pci_read_config32(dev, PCI_VENDOR_ID));
+	} else {
+		pci_write_config32(dev, PCI_SUBSYSTEM_VENDOR_ID,
+				   ((device & 0xffff) << 16) | (vendor &
+								0xffff));
+	}
+}
+
+const struct i915_gpu_controller_info *
+intel_gma_get_controller_info(void)
+{
+	device_t dev = dev_find_slot(0, PCI_DEVFN(0x2,0));
+	if (!dev) {
+		return NULL;
+	}
+	struct northbridge_intel_x4x_config *chip = dev->chip_info;
+	return &chip->gfx;
+}
+
+static void gma_ssdt(device_t device)
+{
+	const struct i915_gpu_controller_info *gfx = intel_gma_get_controller_info();
+	if (!gfx) {
+		return;
+	}
+
+	drivers_intel_gma_displays_ssdt_generate(gfx);
+}
+
+static struct pci_operations gma_pci_ops = {
+	.set_subsystem = gma_set_subsystem,
+};
+
+static struct device_operations gma_func0_ops = {
+	.read_resources = pci_dev_read_resources,
+	.set_resources = pci_dev_set_resources,
+	.enable_resources = pci_dev_enable_resources,
+	.acpi_fill_ssdt_generator = gma_ssdt,
+	.init = gma_func0_init,
+	.scan_bus = 0,
+	.enable = 0,
+	.ops_pci = &gma_pci_ops,
+};
+
+static const unsigned short pci_device_ids[] =
+{
+	0x2e32, 0
+};
+
+static const struct pci_driver gma __pci_driver = {
+	.ops = &gma_func0_ops,
+	.vendor = PCI_VENDOR_ID_INTEL,
+	.devices = pci_device_ids,
+};
diff --git a/src/northbridge/intel/x4x/iomap.h b/src/northbridge/intel/x4x/iomap.h
new file mode 100644
index 0000000000..34153c1b4a
--- /dev/null
+++ b/src/northbridge/intel/x4x/iomap.h
@@ -0,0 +1,28 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2015  Damien Zammit <damien@zamaudio.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#ifndef X4X_IOMAP_H
+#define X4X_IOMAP_H
+
+/* 4 KB per PCIe device */
+#define DEFAULT_PCIEXBAR	CONFIG_MMCONF_BASE_ADDRESS
+
+#define DEFAULT_MCHBAR		0xfed14000	/* 16 KB */
+#define DEFAULT_DMIBAR		0xfed18000	/* 4 KB */
+#define DEFAULT_EPBAR		0xfed19000	/* 4 KB */
+#define DEFAULT_HECIBAR		0xfed10000
+
+#endif /* X4X_IOMAP_H */
diff --git a/src/northbridge/intel/x4x/northbridge.c b/src/northbridge/intel/x4x/northbridge.c
new file mode 100644
index 0000000000..c5a89682a7
--- /dev/null
+++ b/src/northbridge/intel/x4x/northbridge.c
@@ -0,0 +1,234 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2007-2009 coresystems GmbH
+ * Copyright (C) 2015 Damien Zammit <damien@zamaudio.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <console/console.h>
+#include <arch/io.h>
+#include <stdint.h>
+#include <device/device.h>
+#include <device/pci.h>
+#include <device/pci_ids.h>
+#include <device/hypertransport.h>
+#include <stdlib.h>
+#include <string.h>
+#include <cpu/cpu.h>
+#include <boot/tables.h>
+#include <arch/acpi.h>
+#include <northbridge/intel/x4x/chip.h>
+#include <northbridge/intel/x4x/x4x.h>
+
+/* Reserve segments A and B:
+ *
+ * 0xa0000 - 0xbffff: legacy VGA
+ */
+static const int legacy_hole_base_k = 0xa0000 / 1024;
+static const int legacy_hole_size_k = 128;
+
+static void mch_domain_read_resources(device_t dev)
+{
+	u64 tom, touud;
+	u32 tomk, tsegk, tolud, usable_tomk;
+	u32 pcie_config_base, pcie_config_size;
+	u32 uma_sizek = 0;
+
+	/* 1024KiB TSEG */
+	tsegk = 1 << 10;
+
+	pci_domain_read_resources(dev);
+
+	/* Top of Upper Usable DRAM, including remap */
+	touud = pci_read_config16(dev, D0F0_TOUUD);
+	touud <<= 20;
+
+	/* Top of Lower Usable DRAM */
+	tolud = pci_read_config16(dev, D0F0_TOLUD) & 0xfff0;
+	tolud <<= 16;
+
+	/* Top of Memory - does not account for any UMA */
+	tom = pci_read_config16(dev, D0F0_TOM) & 0x01ff;
+	tom <<= 26;
+
+	printk(BIOS_DEBUG, "TOUUD 0x%llx TOLUD 0x%08x TOM 0x%llx\n",
+	       touud, tolud, tom);
+
+	tomk = tolud >> 10;
+
+	/* Graphics memory comes next */
+	const u16 ggc = pci_read_config16(dev, D0F0_GGC);
+	printk(BIOS_DEBUG, "IGD decoded, subtracting ");
+
+	/* Graphics memory */
+	const u32 gms_sizek = decode_igd_memory_size((ggc >> 4) & 0xf);
+	printk(BIOS_DEBUG, "%uM UMA", gms_sizek >> 10);
+
+	/* GTT Graphics Stolen Memory Size (GGMS) */
+	const u32 gsm_sizek = decode_igd_gtt_size((ggc >> 8) & 0xf);
+	printk(BIOS_DEBUG, " and %uM GTT\n", gsm_sizek >> 10);
+
+	uma_sizek = gms_sizek + gsm_sizek + tsegk;
+	usable_tomk = tomk - uma_sizek;
+
+	printk(BIOS_INFO, "Available memory below 4GB: %uM\n", usable_tomk >> 10);
+
+	/* Report the memory regions */
+	ram_resource(dev, 3, 0, legacy_hole_base_k);
+	ram_resource(dev, 4, legacy_hole_base_k + legacy_hole_size_k,
+		     (usable_tomk - (legacy_hole_base_k + legacy_hole_size_k)));
+
+	/*
+	 * If >= 4GB installed then memory from TOLUD to 4GB
+	 * is remapped above TOM, TOUUD will account for both
+	 */
+	touud >>= 10; /* Convert to KB */
+	if (touud > 4096 * 1024) {
+		ram_resource(dev, 5, 4096 * 1024, touud - (4096 * 1024));
+		printk(BIOS_INFO, "Available memory above 4GB: %lluM\n",
+		       (touud >> 10) - 4096);
+	}
+
+	printk(BIOS_DEBUG, "Adding UMA memory area base=0x%08x "
+	       "size=0x%08x\n", usable_tomk << 10, uma_sizek << 10);
+	fixed_mem_resource(dev, 6, usable_tomk, uma_sizek, IORESOURCE_RESERVE);
+
+	/* Some strange hole, reserve it */
+	//fixed_mem_resource(dev, 7, usable_tomk - (0x02000000 >> 10), 0x02000000 >> 10, IORESOURCE_RESERVE);
+
+	if (decode_pciebar(&pcie_config_base, &pcie_config_size)) {
+		printk(BIOS_DEBUG, "Adding PCIe config bar base=0x%08x "
+		       "size=0x%x\n", pcie_config_base, pcie_config_size);
+		fixed_mem_resource(dev, 7, pcie_config_base >> 10,
+			pcie_config_size >> 10, IORESOURCE_RESERVE);
+	}
+}
+
+static void mch_domain_set_resources(device_t dev)
+{
+	struct resource *resource;
+	int i;
+
+	for (i = 3; i < 8; ++i) {
+		/* Report read resources. */
+		resource = probe_resource(dev, i);
+		if (resource)
+			report_resource_stored(dev, resource, "");
+	}
+
+	assign_resources(dev->link_list);
+}
+
+static void mch_domain_init(device_t dev)
+{
+	u32 reg32;
+
+	/* Enable SERR */
+	reg32 = pci_read_config32(dev, PCI_COMMAND);
+	reg32 |= PCI_COMMAND_SERR;
+	pci_write_config32(dev, PCI_COMMAND, reg32);
+}
+
+static struct device_operations pci_domain_ops = {
+	.read_resources   = mch_domain_read_resources,
+	.set_resources    = mch_domain_set_resources,
+	.enable_resources = NULL,
+	.init             = mch_domain_init,
+	.scan_bus         = pci_domain_scan_bus,
+	.ops_pci_bus	  = pci_bus_default_ops,
+	.write_acpi_tables = northbridge_write_acpi_tables,
+	.acpi_fill_ssdt_generator = generate_cpu_entries,
+};
+
+
+static void cpu_bus_init(device_t dev)
+{
+	initialize_cpus(dev->link_list);
+}
+
+static struct device_operations cpu_bus_ops = {
+	.read_resources   = DEVICE_NOOP,
+	.set_resources    = DEVICE_NOOP,
+	.enable_resources = DEVICE_NOOP,
+	.init             = cpu_bus_init,
+	.scan_bus         = 0,
+};
+
+
+static void enable_dev(device_t dev)
+{
+	/* Set the operations if it is a special bus type */
+	if (dev->path.type == DEVICE_PATH_DOMAIN) {
+		dev->ops = &pci_domain_ops;
+#if CONFIG_HAVE_ACPI_RESUME
+		switch (pci_read_config32(dev_find_slot(0, PCI_DEVFN(0, 0)), /*D0F0_SKPD*/0xdc)) {
+		case SKPAD_NORMAL_BOOT_MAGIC:
+			printk(BIOS_DEBUG, "Normal boot.\n");
+			acpi_slp_type=0;
+			break;
+		case SKPAD_ACPI_S3_MAGIC:
+			printk(BIOS_DEBUG, "S3 Resume.\n");
+			acpi_slp_type=3;
+			break;
+		default:
+			printk(BIOS_DEBUG, "Unknown boot method, assuming normal.\n");
+			acpi_slp_type=0;
+			break;
+		}
+#endif
+	} else if (dev->path.type == DEVICE_PATH_CPU_CLUSTER) {
+		dev->ops = &cpu_bus_ops;
+	}
+}
+
+static void x4x_init(void *const chip_info)
+{
+	int dev, fn, bit_base;
+
+	struct device *const d0f0 = dev_find_slot(0, 0);
+
+	/* Hide internal functions based on devicetree info. */
+	for (dev = 3; dev > 0; --dev) {
+		switch (dev) {
+		case 3: /* ME */
+			fn = 3;
+			bit_base = 6;
+			break;
+		case 2: /* IGD */
+			fn = 1;
+			bit_base = 3;
+			break;
+		case 1: /* PEG */
+			fn = 0;
+			bit_base = 1;
+			break;
+		}
+		for (; fn >= 0; --fn) {
+			const struct device *const d =
+				dev_find_slot(0, PCI_DEVFN(dev, fn));
+			if (!d || d->enabled) continue;
+			const u32 deven = pci_read_config32(d0f0, D0F0_DEVEN);
+			pci_write_config32(d0f0, D0F0_DEVEN,
+					   deven & ~(1 << (bit_base + fn)));
+		}
+	}
+
+	const u32 deven = pci_read_config32(d0f0, D0F0_DEVEN);
+	if (!(deven & (0xf << 6)))
+		pci_write_config32(d0f0, D0F0_DEVEN, deven & ~(1 << 14));
+}
+
+struct chip_operations northbridge_intel_x4x_ops = {
+	CHIP_NAME("Intel 4-Series Northbridge")
+	.enable_dev = enable_dev,
+	.init = x4x_init,
+};
diff --git a/src/northbridge/intel/x4x/ram_calc.c b/src/northbridge/intel/x4x/ram_calc.c
new file mode 100644
index 0000000000..f11b19a9f1
--- /dev/null
+++ b/src/northbridge/intel/x4x/ram_calc.c
@@ -0,0 +1,88 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2012 secunet Security Networks AG
+ * Copyright (C) 2015 Damien Zammit <damien@zamaudio.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; version 2 of
+ * the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#define __SIMPLE_DEVICE__
+
+#include <commonlib/helpers.h>
+#include <stdint.h>
+#include <arch/io.h>
+#include <device/pci_def.h>
+#include <console/console.h>
+#include <northbridge/intel/x4x/x4x.h>
+
+/** Decodes used Graphics Mode Select (GMS) to kilobytes. */
+u32 decode_igd_memory_size(const u32 gms)
+{
+	static const u16 ggc2uma[] = { 0, 0, 0, 0, 0,
+			32, 48, 64, 128, 256, 96, 160, 224, 352 };
+
+	if (gms > ARRAY_SIZE(ggc2uma))
+		die("Bad Graphics Mode Select (GMS) setting.\n");
+
+	return ggc2uma[gms] << 10;
+}
+
+/** Decodes used GTT Graphics Memory Size (GGMS) to kilobytes. */
+u32 decode_igd_gtt_size(const u32 gsm)
+{
+	static const u8 ggc2gtt[] = { 0, 1, 0, 2, 0, 0, 0, 0, 0, 2, 3, 4};
+
+	if (gsm > ARRAY_SIZE(ggc2gtt))
+		die("Bad GTT Graphics Memory Size (GGMS) setting.\n");
+
+	return ggc2gtt[gsm] << 10;
+}
+
+u8 decode_pciebar(u32 *const base, u32 *const len)
+{
+	*base = 0;
+	*len = 0;
+	const pci_devfn_t dev = PCI_DEV(0,0,0);
+	u32 pciexbar = 0;
+	u32 pciexbar_reg;
+	u32 reg32;
+	int max_buses;
+	const struct {
+		u16 num_buses;
+		u32 addr_mask;
+	} busmask[] = {
+		{256, 0xf0000000},
+		{128, 0xf8000000},
+		{64,  0xfc000000},
+		{0,   0},
+	};
+
+	pciexbar_reg = pci_read_config32(dev, D0F0_PCIEXBAR_LO);
+
+	if (!(pciexbar_reg & 1)) {
+		printk(BIOS_WARNING, "WARNING: MMCONF not set\n");
+		return 0;
+	}
+
+	reg32 = (pciexbar_reg >> 1) & 3;
+	pciexbar = pciexbar_reg & busmask[reg32].addr_mask;
+	max_buses = busmask[reg32].num_buses;
+
+	if (!pciexbar) {
+		printk(BIOS_WARNING, "WARNING: pciexbar invalid\n");
+		return 0;
+	}
+
+	*base = pciexbar;
+	*len = max_buses << 20;
+	return 1;
+}
diff --git a/src/northbridge/intel/x4x/x4x.h b/src/northbridge/intel/x4x/x4x.h
new file mode 100644
index 0000000000..89ca9313b9
--- /dev/null
+++ b/src/northbridge/intel/x4x/x4x.h
@@ -0,0 +1,320 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2007-2008 coresystems GmbH
+ *               2012 secunet Security Networks AG
+ * Copyright (C) 2015 Damien Zammit <damien@zamaudio.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#ifndef __NORTHBRIDGE_INTEL_X4X_H__
+#define __NORTHBRIDGE_INTEL_X4X_H__
+
+#include <northbridge/intel/x4x/iomap.h>
+#include <southbridge/intel/i82801gx/i82801gx.h>
+
+/*
+ * D0:F0
+ */
+#define D0F0_EPBAR_LO 0x40
+#define D0F0_EPBAR_HI 0x44
+#define D0F0_MCHBAR_LO 0x48
+#define D0F0_MCHBAR_HI 0x4c
+#define D0F0_GGC 0x52
+#define D0F0_DEVEN 0x54
+#define D0F0_PCIEXBAR_LO 0x60
+#define D0F0_PCIEXBAR_HI 0x64
+#define D0F0_DMIBAR_LO 0x68
+#define D0F0_DMIBAR_HI 0x6c
+#define D0F0_PMBASE 0x78
+#define D0F0_PAM(x) (0x90+(x)) /* 0-6*/
+#define D0F0_REMAPBASE 0x98
+#define D0F0_REMAPLIMIT 0x9a
+#define D0F0_SMRAM 0x9d
+#define D0F0_ESMRAMC 0x9e
+#define D0F0_TOM 0xa0
+#define D0F0_TOUUD 0xa2
+#define D0F0_TOLUD 0xb0
+#define D0F0_GBSM 0xa4
+#define D0F0_BGSM 0xa8
+#define D0F0_TSEG 0xac
+#define D0F0_SKPD 0xdc /* Scratchpad Data */
+#define D0F0_CAPID0 0xe0
+
+/*
+ * D1:F0 PEG
+ */
+#define PEG_CAP 0xa2
+#define SLOTCAP 0xb4
+#define PEGLC 0xec
+#define D1F0_VCCAP 0x104
+#define D1F0_VC0RCTL 0x114
+
+/*
+ * Graphics frequencies
+ */
+#define GCFGC_PCIDEV		PCI_DEV(0, 2, 0)
+#define GCFGC_OFFSET		0xf0
+#define GCFGC_CR_SHIFT		0
+#define GCFGC_CR_MASK		(0xf << GCFGC_CR_SHIFT)
+#define GCFGC_CS_SHIFT		8
+#define GCFGC_CS_MASK		(0xf << GCFGC_CS_SHIFT)
+#define GCFGC_CD_SHIFT		12
+#define GCFGC_CD_MASK		(0x1 << GCFGC_CD_SHIFT)
+#define GCFGC_UPDATE_SHIFT	5
+#define GCFGC_UPDATE		(0x1 << GCFGC_UPDATE_SHIFT)
+
+/*
+ * MCHBAR
+ */
+
+#define MCHBAR8(x) *((volatile u8 *)(DEFAULT_MCHBAR + x))
+#define MCHBAR16(x) *((volatile u16 *)(DEFAULT_MCHBAR + x))
+#define MCHBAR32(x) *((volatile u32 *)(DEFAULT_MCHBAR + x))
+
+#define PMSTS_MCHBAR		0x0f14	/* Self refresh channel status */
+#define PMSTS_WARM_RESET	(1 << 1)
+#define PMSTS_BOTH_SELFREFRESH	(1 << 0)
+
+#define CLKCFG_MCHBAR		0x0c00
+#define CLKCFG_FSBCLK_SHIFT	0
+#define CLKCFG_FSBCLK_MASK	(7 << CLKCFG_FSBCLK_SHIFT)
+#define CLKCFG_MEMCLK_SHIFT	4
+#define CLKCFG_MEMCLK_MASK	(7 << CLKCFG_MEMCLK_SHIFT)
+#define CLKCFG_UPDATE		(1 << 12)
+
+#define SSKPD_MCHBAR		0x0c1c
+#define SSKPD_CLK_SHIFT		0
+#define SSKPD_CLK_MASK		(7 << SSKPD_CLK_SHIFT)
+
+/*
+ * DMIBAR
+ */
+
+#define DMIBAR8(x) *((volatile u8 *)(DEFAULT_DMIBAR + x))
+#define DMIBAR16(x) *((volatile u16 *)(DEFAULT_DMIBAR + x))
+#define DMIBAR32(x) *((volatile u32 *)(DEFAULT_DMIBAR + x))
+
+#define DMIVC0RCTL 0x14
+#define DMIVC1RCTL 0x20
+#define DMIVC1RSTS 0x26
+#define DMIESD  0x44
+#define DMILE1D 0x50
+#define DMILE1A 0x58
+#define DMILE2D 0x60
+#define DMILE2A 0x68
+
+/*
+ * EPBAR
+ */
+
+#define EPBAR8(x) *((volatile u8 *)(DEFAULT_EPBAR + x))
+#define EPBAR16(x) *((volatile u16 *)(DEFAULT_EPBAR + x))
+#define EPBAR32(x) *((volatile u32 *)(DEFAULT_EPBAR + x))
+
+#define EPESD 0x44
+#define EPLE1D 0x50
+#define EPLE1A 0x58
+#define EPLE2D 0x60
+
+#define NOP_CMD 0x2
+#define PRECHARGE_CMD 0x4
+#define MRS_CMD 0x6
+#define EMRS_CMD 0x8
+#define EMRS1_CMD (EMRS_CMD | 0x10)
+#define EMRS2_CMD (EMRS_CMD | 0x20)
+#define EMRS3_CMD (EMRS_CMD | 0x30)
+#define ZQCAL_CMD 0xa
+#define CBR_CMD 0xc
+#define NORMALOP_CMD 0xe
+
+#define TOTAL_CHANNELS 2
+#define TOTAL_DIMMS 4
+
+#define DIMM_IS_POPULATED(dimms, idx) (dimms[idx].card_type != 0)
+#define IF_DIMM_POPULATED(dimms, idx) if (dimms[idx].card_type != 0)
+#define ONLY_DIMMA_IS_POPULATED(dimms, ch) ( \
+	(DIMM_IS_POPULATED(dimms, (ch == 0) ? 0 : 2) && \
+	!DIMM_IS_POPULATED(dimms, (ch == 0) ? 1 : 3)))
+#define ONLY_DIMMB_IS_POPULATED(dimms, ch) ( \
+	(DIMM_IS_POPULATED(dimms, (ch == 0) ? 1 : 3) && \
+	!DIMM_IS_POPULATED(dimms, (ch == 0) ? 0 : 2)))
+#define BOTH_DIMMS_ARE_POPULATED(dimms, ch) ( \
+	(DIMM_IS_POPULATED(dimms, (ch == 0) ? 0 : 2) && \
+	(DIMM_IS_POPULATED(dimms, (ch == 0) ? 1 : 3))))
+#define FOR_EACH_DIMM(idx) \
+	for (idx = 0; idx < TOTAL_DIMMS; ++idx)
+#define FOR_EACH_POPULATED_DIMM(dimms, idx) \
+	FOR_EACH_DIMM(idx) IF_DIMM_POPULATED(dimms, idx)
+#define CHANNEL_IS_POPULATED(dimms, idx) ((dimms[idx<<1].card_type != 0) || (dimms[(idx<<1) + 1].card_type != 0))
+#define CHANNEL_IS_CARDF(dimms, idx) ((dimms[idx<<1].card_type == 0xf) || (dimms[(idx<<1) + 1].card_type == 0xf))
+#define IF_CHANNEL_POPULATED(dimms, idx) if ((dimms[idx<<1].card_type != 0) || (dimms[(idx<<1) + 1].card_type != 0))
+#define FOR_EACH_CHANNEL(idx) \
+	for (idx = 0; idx < TOTAL_CHANNELS; ++idx)
+#define FOR_EACH_POPULATED_CHANNEL(dimms, idx) \
+	FOR_EACH_CHANNEL(idx) IF_CHANNEL_POPULATED(dimms, idx)
+
+#define RANKS_PER_CHANNEL 4
+#define RANK_IS_POPULATED(dimms, ch, r) \
+	((dimms[ch<<1].card_type && ((r) < dimms[ch<<1].ranks)) || \
+	(dimms[(ch<<1) + 1].card_type && ((r) >= 2) && ((r) < (dimms[(ch<<1) + 1].ranks + 2))))
+#define IF_RANK_POPULATED(dimms, ch, r) \
+	if ((dimms[ch<<1].card_type && ((r) < dimms[ch<<1].ranks)) || \
+	    (dimms[(ch<<1) + 1].card_type && ((r) >= 2) && ((r) < (dimms[(ch<<1) + 1].ranks + 2))))
+#define FOR_EACH_RANK_IN_CHANNEL(r) \
+	for (r = 0; r < RANKS_PER_CHANNEL; ++r)
+#define FOR_EACH_POPULATED_RANK_IN_CHANNEL(dimms, ch, r) \
+	FOR_EACH_RANK_IN_CHANNEL(r) IF_RANK_POPULATED(dimms, ch, r)
+#define FOR_EACH_RANK(ch, r) \
+	FOR_EACH_CHANNEL(ch) FOR_EACH_RANK_IN_CHANNEL(r)
+#define FOR_EACH_POPULATED_RANK(dimms, ch, r) \
+	FOR_EACH_RANK(ch, r) IF_RANK_POPULATED(dimms, ch, r)
+
+#define DDR3_MAX_CAS 18
+
+enum fsb_clock {
+	FSB_CLOCK_800MHz	= 0,
+	FSB_CLOCK_1066MHz	= 1,
+	FSB_CLOCK_1333MHz	= 2,
+};
+
+enum mem_clock {
+	MEM_CLOCK_400MHz  = 0,
+	MEM_CLOCK_533MHz  = 1,
+	MEM_CLOCK_667MHz  = 2,
+	MEM_CLOCK_800MHz  = 3,
+	MEM_CLOCK_1066MHz  = 4,
+	MEM_CLOCK_1333MHz  = 5,
+};
+
+enum ddr {
+	DDR2 = 2,
+	DDR3 = 3,
+};
+
+enum ddrxspd {
+	DDR2SPD = 0x8,
+	DDR3SPD = 0xb,
+};
+
+enum chip_width { /* as in DDR3 spd */
+	CHIP_WIDTH_x4	= 0,
+	CHIP_WIDTH_x8	= 1,
+	CHIP_WIDTH_x16	= 2,
+	CHIP_WIDTH_x32	= 3,
+};
+
+enum chip_cap { /* as in DDR3 spd */
+	CHIP_CAP_256M	= 0,
+	CHIP_CAP_512M	= 1,
+	CHIP_CAP_1G	= 2,
+	CHIP_CAP_2G	= 3,
+	CHIP_CAP_4G	= 4,
+	CHIP_CAP_8G	= 5,
+	CHIP_CAP_16G	= 6,
+};
+
+struct timings {
+	unsigned int	CAS;
+	enum fsb_clock	fsb_clk;
+	enum mem_clock	mem_clk;
+	unsigned int	tRAS;
+	unsigned int	tRP;
+	unsigned int	tRCD;
+	unsigned int	tWR;
+	unsigned int	tRFC;
+	unsigned int	tWTR;
+	unsigned int	tRRD;
+	unsigned int	tRTP;
+};
+
+struct dimminfo {
+	unsigned int	card_type; /* 0x0: unpopulated,
+				      0xa - 0xf: raw card type A - F */
+	enum chip_width	width;
+	enum chip_cap	chip_capacity;
+	unsigned int	page_size; /* of whole DIMM in Bytes (4096 or 8192) */
+	unsigned int	sides;
+	unsigned int	banks;
+	unsigned int	ranks;
+	unsigned int	rows;
+	unsigned int	cols;
+	unsigned int	cas_latencies;
+	unsigned int	tAAmin;
+	unsigned int	tCKmin;
+	unsigned int	tWR;
+	unsigned int	tRP;
+	unsigned int	tRCD;
+	unsigned int	tRAS;
+	unsigned int	rank_capacity_mb; /* per rank in Mega Bytes */
+	u8		spd_data[256];
+};
+
+/* The setup is up to two DIMMs per channel */
+struct sysinfo {
+	int		txt_enabled;
+	int		cores;
+	int		boot_path;
+	int		max_ddr2_mhz;
+	int		max_ddr3_mt;
+	enum fsb_clock	max_fsb;
+	int		max_fsb_mhz;
+	int		max_render_mhz;
+	int		enable_igd;
+	int		enable_peg;
+	u16		ggc;
+
+	int		dimm_config[2];
+	int		dimms_per_ch;
+	int		spd_type;
+	int		channel_capacity[2];
+	struct timings	selected_timings;
+	struct dimminfo	dimms[4];
+	u8		spd_map[4];
+};
+
+enum ddr2_signals {
+        CLKSET0 = 0,
+        CTRL0,
+        CLKSET1,
+        CMD,
+        CTRL1,
+        CTRL2,
+        CTRL3,
+        DQS1,
+        DQS2,
+        DQS3,
+        DQS4,
+        DQS5,
+        DQS6,
+        DQS7,
+        DQS8,
+        DQ1,
+        DQ2,
+        DQ3,
+        DQ4,
+        DQ5,
+        DQ6,
+        DQ7,
+        DQ8
+};
+
+void x4x_early_init(void);
+u32 decode_igd_memory_size(u32 gms);
+u32 decode_igd_gtt_size(u32 gsm);
+u8 decode_pciebar(u32 *const base, u32 *const len);
+void sdram_initialize(int boot_path, const u8 *spd_map);
+void raminit_ddr2(struct sysinfo *);
+
+struct acpi_rsdp;
+unsigned long northbridge_write_acpi_tables(device_t device, unsigned long start, struct acpi_rsdp *rsdp);
+
+#endif /* __NORTHBRIDGE_INTEL_X4X_H__ */