lenovo/t420: Add new port

This is based on t420s. Tested on a T420 without discrete GPU.
There is no support for nvidia gpu and optimus.

Signed-off-by: Nicolas Reinecke <nr@das-labor.org>
Tested-by: Iru Cai <mytbk920423@gmail.com>
Change-Id: Ie9405966e56180ac1c43a3c5b83181ee500177c8
Reviewed-on: https://review.coreboot.org/11765
Tested-by: build bot (Jenkins)
Reviewed-by: Martin Roth <martinroth@google.com>

18 files changed, 1213 insertions, 0 deletions

diff --git a/src/mainboard/lenovo/t420/Kconfig b/src/mainboard/lenovo/t420/Kconfig
new file mode 100644
index 0000000000..04233e7ef6
--- /dev/null
+++ b/src/mainboard/lenovo/t420/Kconfig
@@ -0,0 +1,79 @@
+if BOARD_LENOVO_T420
+
+config BOARD_SPECIFIC_OPTIONS # dummy
+	def_bool y
+	select SYSTEM_TYPE_LAPTOP
+	select CPU_INTEL_SOCKET_RPGA988B
+	select NORTHBRIDGE_INTEL_SANDYBRIDGE
+	select USE_NATIVE_RAMINIT
+	select SOUTHBRIDGE_INTEL_BD82X6X
+	select EC_LENOVO_PMH7
+	select EC_LENOVO_H8
+	select NO_UART_ON_SUPERIO
+	select BOARD_ROMSIZE_KB_8192
+	select HAVE_ACPI_TABLES
+	select HAVE_OPTION_TABLE
+	select HAVE_CMOS_DEFAULT
+	select HAVE_ACPI_RESUME
+	select INTEL_INT15
+	select SANDYBRIDGE_IVYBRIDGE_LVDS
+	select ENABLE_VMX
+	select DRIVERS_RICOH_RCE822
+	select MAINBOARD_HAS_LPC_TPM
+
+	# Workaround for EC/KBC IRQ1.
+	select SERIRQ_CONTINUOUS_MODE
+
+config HAVE_IFD_BIN
+	bool
+	default n
+
+config HAVE_ME_BIN
+	bool
+	default n
+
+config MAINBOARD_DIR
+	string
+	default lenovo/t420
+
+config MAINBOARD_PART_NUMBER
+	string
+	default "ThinkPad T420"
+
+config MMCONF_BASE_ADDRESS
+	hex
+	default 0xf8000000
+
+config MAX_CPUS
+	int
+	default 8
+
+config USBDEBUG_HCD_INDEX
+	int
+	default 2
+
+config DRAM_RESET_GATE_GPIO
+	int
+	default 10
+
+config VGA_BIOS_FILE
+	string
+	default "pci8086,0126.rom"
+
+config VGA_BIOS_ID
+	string
+	default "8086,0126"
+
+config MAINBOARD_PCI_SUBSYSTEM_VENDOR_ID
+	hex
+	default 0x17aa
+
+config MAINBOARD_PCI_SUBSYSTEM_DEVICE_ID
+	hex
+	default 0x21ce
+
+config ONBOARD_VGA_IS_PRIMARY
+	bool
+	default y
+
+endif # BOARD_LENOVO_T420
diff --git a/src/mainboard/lenovo/t420/Kconfig.name b/src/mainboard/lenovo/t420/Kconfig.name
new file mode 100644
index 0000000000..75570ad9b6
--- /dev/null
+++ b/src/mainboard/lenovo/t420/Kconfig.name
@@ -0,0 +1,2 @@
+config BOARD_LENOVO_T420
+	bool "ThinkPad T420"
diff --git a/src/mainboard/lenovo/t420/Makefile.inc b/src/mainboard/lenovo/t420/Makefile.inc
new file mode 100644
index 0000000000..9eb141adc9
--- /dev/null
+++ b/src/mainboard/lenovo/t420/Makefile.inc
@@ -0,0 +1,17 @@
+##
+## This file is part of the coreboot project.
+##
+## Copyright (C) 2011 The ChromiumOS Authors.  All rights reserved.
+##
+## 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.
+##
+
+smm-$(CONFIG_HAVE_SMI_HANDLER) += smihandler.c
+romstage-y += gpio.c
diff --git a/src/mainboard/lenovo/t420/acpi/ec.asl b/src/mainboard/lenovo/t420/acpi/ec.asl
new file mode 100644
index 0000000000..d631f121fb
--- /dev/null
+++ b/src/mainboard/lenovo/t420/acpi/ec.asl
@@ -0,0 +1,21 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (c) 2011 Sven Schnelle <svens@stackframe.org>
+ *
+ * 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 <ec/lenovo/h8/acpi/ec.asl>
+
+Scope(\_SB.PCI0.LPCB.EC)
+{
+}
diff --git a/src/mainboard/lenovo/t420/acpi/platform.asl b/src/mainboard/lenovo/t420/acpi/platform.asl
new file mode 100644
index 0000000000..2ba5b2000d
--- /dev/null
+++ b/src/mainboard/lenovo/t420/acpi/platform.asl
@@ -0,0 +1,35 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2011-2012 The Chromium OS Authors. All rights reserved.
+ *
+ * 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.
+ */
+
+/* The _PTS method (Prepare To Sleep) is called before the OS is
+ * entering a sleep state. The sleep state number is passed in Arg0
+ */
+
+Method(_PTS,1)
+{
+	\_SB.PCI0.LPCB.EC.RADI(0)
+}
+
+/* The _WAK method is called on system wakeup */
+
+Method(_WAK,1)
+{
+	/* ME may not be up yet. */
+	Store (0, \_TZ.MEB1)
+	Store (0, \_TZ.MEB2)
+
+	/* Not implemented. */
+	Return(Package(){0,0})
+}
diff --git a/src/mainboard/lenovo/t420/acpi/superio.asl b/src/mainboard/lenovo/t420/acpi/superio.asl
new file mode 100644
index 0000000000..03b65bc816
--- /dev/null
+++ b/src/mainboard/lenovo/t420/acpi/superio.asl
@@ -0,0 +1 @@
+#include <drivers/pc80/ps2_controller.asl>
diff --git a/src/mainboard/lenovo/t420/acpi_tables.c b/src/mainboard/lenovo/t420/acpi_tables.c
new file mode 100644
index 0000000000..b84b28776a
--- /dev/null
+++ b/src/mainboard/lenovo/t420/acpi_tables.c
@@ -0,0 +1,42 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2007-2009 coresystems GmbH
+ *
+ * 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/acpigen.h>
+#include <southbridge/intel/bd82x6x/nvs.h>
+#include "thermal.h"
+
+static void acpi_update_thermal_table(global_nvs_t *gnvs)
+{
+	gnvs->tcrt = CRITICAL_TEMPERATURE;
+	gnvs->tpsv = PASSIVE_TEMPERATURE;
+}
+
+void acpi_create_gnvs(global_nvs_t *gnvs)
+{
+	/* Disable USB ports in S3 by default */
+	gnvs->s3u0 = 0;
+	gnvs->s3u1 = 0;
+
+	/* Disable USB ports in S5 by default */
+	gnvs->s5u0 = 0;
+	gnvs->s5u1 = 0;
+
+	/* IGD Displays */
+
+	// the lid is open by default.
+	gnvs->lids = 1;
+
+	acpi_update_thermal_table(gnvs);
+}
diff --git a/src/mainboard/lenovo/t420/board_info.txt b/src/mainboard/lenovo/t420/board_info.txt
new file mode 100644
index 0000000000..c0f04ca74b
--- /dev/null
+++ b/src/mainboard/lenovo/t420/board_info.txt
@@ -0,0 +1,6 @@
+Category: laptop
+ROM package: SOIC-8 / WSON-8
+ROM protocol: SPI
+ROM socketed: n
+Flashrom support: n
+Release year: 2011
diff --git a/src/mainboard/lenovo/t420/cmos.default b/src/mainboard/lenovo/t420/cmos.default
new file mode 100644
index 0000000000..1b8e212894
--- /dev/null
+++ b/src/mainboard/lenovo/t420/cmos.default
@@ -0,0 +1,16 @@
+boot_option=Fallback
+baud_rate=115200
+debug_level=Spew
+power_on_after_fail=Disable
+nmi=Enable
+volume=0x3
+first_battery=Primary
+bluetooth=Enable
+wwan=Enable
+wlan=Enable
+touchpad=Enable
+sata_mode=AHCI
+fn_ctrl_swap=Disable
+sticky_fn=Disable
+trackpoint=Enable
+hyper_threading=Enable
diff --git a/src/mainboard/lenovo/t420/cmos.layout b/src/mainboard/lenovo/t420/cmos.layout
new file mode 100644
index 0000000000..bf0f195425
--- /dev/null
+++ b/src/mainboard/lenovo/t420/cmos.layout
@@ -0,0 +1,142 @@
+##
+## This file is part of the coreboot project.
+##
+## Copyright (C) 2007-2008 coresystems GmbH
+## Copyright (C) 2014 Vladimir Serbinenko
+##
+## 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.
+##
+
+# -----------------------------------------------------------------
+entries
+
+# -----------------------------------------------------------------
+# Status Register A
+# -----------------------------------------------------------------
+# Status Register B
+# -----------------------------------------------------------------
+# Status Register C
+#96           4       r       0        status_c_rsvd
+#100          1       r       0        uf_flag
+#101          1       r       0        af_flag
+#102          1       r       0        pf_flag
+#103          1       r       0        irqf_flag
+# -----------------------------------------------------------------
+# Status Register D
+#104          7       r       0        status_d_rsvd
+#111          1       r       0        valid_cmos_ram
+# -----------------------------------------------------------------
+# Diagnostic Status Register
+#112          8       r       0        diag_rsvd1
+
+# -----------------------------------------------------------------
+0            120     r       0        reserved_memory
+#120          264     r       0        unused
+
+# -----------------------------------------------------------------
+# RTC_BOOT_BYTE (coreboot hardcoded)
+384          1       e       4        boot_option
+388          4       r       0        reboot_bits
+#390          2       r       0        unused?
+
+# -----------------------------------------------------------------
+# coreboot config options: console
+392          3       e       5        baud_rate
+395          4       e       6        debug_level
+#399          1       r       0        unused
+
+#400         8       r       0        reserved for century byte
+
+# coreboot config options: southbridge
+408          1       e       1        nmi
+409          2       e       7        power_on_after_fail
+
+# coreboot config options: EC
+411          1       e       8        first_battery
+412          1       e       1        bluetooth
+413          1       e       1        wwan
+414          1       e       1        touchpad
+415          1       e       1        wlan
+416          1       e       1        trackpoint
+417          1       e       1        fn_ctrl_swap
+418          1       e       1        sticky_fn
+419          1       e       1        power_management_beeps
+421          1       e       9        sata_mode
+#422          2       r       1        unused
+
+# coreboot config options: cpu
+424          1       e       2        hyper_threading
+#425          7       r       0        unused
+
+# coreboot config options: northbridge
+432          3       e       11       gfx_uma_size
+#435          5       r       0        unused
+
+440          8       h       0        volume
+
+# SandyBridge MRC Scrambler Seed values
+896          32      r       0        mrc_scrambler_seed
+928          32      r       0        mrc_scrambler_seed_s3
+960          16      r       0        mrc_scrambler_seed_chk
+
+# coreboot config options: check sums
+984          16      h       0        check_sum
+
+# -----------------------------------------------------------------
+
+enumerations
+
+#ID value   text
+1     0     Disable
+1     1     Enable
+2     0     Enable
+2     1     Disable
+4     0     Fallback
+4     1     Normal
+5     0     115200
+5     1     57600
+5     2     38400
+5     3     19200
+5     4     9600
+5     5     4800
+5     6     2400
+5     7     1200
+6     1     Emergency
+6     2     Alert
+6     3     Critical
+6     4     Error
+6     5     Warning
+6     6     Notice
+6     7     Info
+6     8     Debug
+6     9     Spew
+7     0     Disable
+7     1     Enable
+7     2     Keep
+8     0     Secondary
+8     1     Primary
+9     0     AHCI
+9     1     Compatible
+10    0     Both
+10    1     Keyboard only
+10    2     Thinklight only
+10    3     None
+11    0     32M
+11    1     64M
+11    2     96M
+11    3     128M
+11    4     160M
+11    5     192M
+11    6     224M
+
+# -----------------------------------------------------------------
+checksums
+
+checksum 392 415 984
diff --git a/src/mainboard/lenovo/t420/devicetree.cb b/src/mainboard/lenovo/t420/devicetree.cb
new file mode 100644
index 0000000000..8041e5b2e2
--- /dev/null
+++ b/src/mainboard/lenovo/t420/devicetree.cb
@@ -0,0 +1,180 @@
+chip northbridge/intel/sandybridge
+	# IGD Displays
+	register "gfx.ndid" = "3"
+	register "gfx.did" = "{ 0x80000100, 0x80000240, 0x80000410, 0x80000410, 0x00000005 }"
+
+	# Enable DisplayPort Hotplug with 6ms pulse
+	register "gpu_dp_d_hotplug" = "0x06"
+
+	# Enable Panel as LVDS and configure power delays
+	register "gpu_panel_port_select" = "0"			# LVDS
+	register "gpu_panel_power_cycle_delay" = "1"
+	register "gpu_panel_power_up_delay" = "300"		# T1+T2: 30ms
+	register "gpu_panel_power_down_delay" = "300"		# T5+T6: 30ms
+	register "gpu_panel_power_backlight_on_delay" = "2000"	# T3: 200ms
+	register "gpu_panel_power_backlight_off_delay" = "2000"	# T4: 200ms
+	register "gfx.use_spread_spectrum_clock" = "1"
+	register "gfx.link_frequency_270_mhz" = "1"
+	register "gpu_cpu_backlight" = "0x1155"
+	register "gpu_pch_backlight" = "0x06100610"
+
+	device cpu_cluster 0 on
+		chip cpu/intel/socket_rPGA988B
+			device lapic 0 on end
+		end
+		chip cpu/intel/model_206ax
+			# Magic APIC ID to locate this chip
+			device lapic 0xACAC off end
+
+			register "c1_acpower" = "1"	# ACPI(C1) = MWAIT(C1)
+			register "c2_acpower" = "3"	# ACPI(C2) = MWAIT(C3)
+			register "c3_acpower" = "5"	# ACPI(C3) = MWAIT(C7)
+
+			register "c1_battery" = "1"	# ACPI(C1) = MWAIT(C1)
+			register "c2_battery" = "3"	# ACPI(C2) = MWAIT(C3)
+			register "c3_battery" = "5"	# ACPI(C3) = MWAIT(C7)
+		end
+	end
+
+	device domain 0 on
+		device pci 00.0 on
+			subsystemid 0x17aa 0x21ce
+		end # host bridge
+		device pci 01.0 off end # PCIe Bridge for discrete graphics
+		device pci 02.0 on
+			subsystemid 0x17aa 0x21ce
+		end # Integrated Graphics Controller
+
+		chip southbridge/intel/bd82x6x # Intel Series 6 Cougar Point PCH
+			# GPI routing
+			#  0 No effect (default)
+			#  1 SMI# (if corresponding ALT_GPI_SMI_EN bit is also set)
+			#  2 SCI (if corresponding GPIO_EN bit is also set)
+			register "alt_gp_smi_en" = "0x0000"
+			register "gpi1_routing" = "2"
+			register "gpi13_routing" = "2"
+
+			# Enable SATA ports 0 (HDD bay) & 1 (ODD bay) & 2 (mSATA) & 4 (dock) & 5 (eSATA)
+			register "sata_port_map" = "0x37"
+			# Set max SATA speed to 6.0 Gb/s
+			register "sata_interface_speed_support" = "0x3"
+
+			register "gen1_dec" = "0x7c1601"
+			register "gen2_dec" = "0x0c15e1"
+			register "gen4_dec" = "0x0c06a1"
+
+			register "pcie_hotplug_map" = "{ 0, 0, 0, 1, 0, 0, 0, 0 }"
+
+			# Enable zero-based linear PCIe root port functions
+			register "pcie_port_coalesce" = "1"
+			register "c2_latency" = "101"  # c2 not supported
+			register "p_cnt_throttling_supported" = "1"
+
+			device pci 16.0 off end # Management Engine Interface 1
+			device pci 16.1 off end # Management Engine Interface 2
+			device pci 16.2 off end # Management Engine IDE-R
+			device pci 16.3 off end # Management Engine KT
+			device pci 19.0 on
+				subsystemid 0x17aa 0x21ce
+			end # Intel Gigabit Ethernet
+			device pci 1a.0 on
+				subsystemid 0x17aa 0x21ce
+			end # USB Enhanced Host Controller #2
+			device pci 1b.0 on
+				subsystemid 0x17aa 0x21ce
+			end # High Definition Audio Controller
+			device pci 1c.0 off end # PCIe Port #1
+			device pci 1c.1 on
+				subsystemid 0x17aa 0x21ce
+			end # PCIe Port #2 Integrated Wireless LAN
+			device pci 1c.2 off end # PCIe Port #3
+			device pci 1c.3 on
+				subsystemid 0x17aa 0x21ce
+			end # PCIe Port #4 ExpressCard
+			device pci 1c.4 on
+				subsystemid 0x17aa 0x21ce
+				chip drivers/ricoh/rce822
+					register "sdwppol" = "1"
+					register "disable_mask" = "0x87"
+					device pci 00.0 on
+						subsystemid 0x17aa 0x21ce
+					end
+				end
+			end # PCIe Port #5 (Ricoh SD & FW)
+			device pci 1c.5 off end # PCIe Port #6 Intel Gigabit Ethernet PHY (not PCIe)
+			device pci 1c.6 off end # PCIe Port #7
+			device pci 1c.7 off end # PCIe Port #8
+			device pci 1d.0 on
+				subsystemid 0x17aa 0x21ce
+			end # USB Enhanced Host Controller #1
+			device pci 1e.0 off end # PCI bridge
+			device pci 1f.0 on
+				subsystemid 0x17aa 0x21ce
+				chip ec/lenovo/pmh7
+					device pnp ff.1 on # dummy
+					end
+					register "backlight_enable" = "0x01"
+					register "dock_event_enable" = "0x01"
+				end
+
+				chip drivers/pc80/tpm
+					device pnp 0c31.0 on end
+				end
+
+				chip ec/lenovo/h8
+					device pnp ff.2 on # dummy
+						io 0x60 = 0x62
+						io 0x62 = 0x66
+						io 0x64 = 0x1600
+						io 0x66 = 0x1604
+					end
+
+					register "config0" = "0xa7"
+					register "config1" = "0x01"
+					register "config2" = "0xa0"
+					register "config3" = "0xe2"
+
+					register "has_keyboard_backlight" = "0"
+
+					register "beepmask0" = "0x02"
+					register "beepmask1" = "0x86"
+					register "has_power_management_beeps" = "1"
+					register "event2_enable" = "0xff"
+					register "event3_enable" = "0xff"
+					register "event4_enable" = "0xf0"
+					register "event5_enable" = "0x3c"
+					register "event6_enable" = "0x00"
+					register "event7_enable" = "0xa1"
+					register "event8_enable" = "0x7b"
+					register "event9_enable" = "0xff"
+					register "eventa_enable" = "0x00"
+					register "eventb_enable" = "0x00"
+					register "eventc_enable" = "0xff"
+					register "eventd_enable" = "0xff"
+					register "evente_enable" = "0x0d"
+				end
+			end # LPC Controller
+			device pci 1f.2 on
+				subsystemid 0x17aa 0x21ce
+			end # 6 port SATA AHCI Controller
+			device pci 1f.3 on
+				subsystemid 0x17aa 0x21ce
+				# eeprom, 8 virtual devices, same chip
+				chip drivers/i2c/at24rf08c
+					device i2c 54 on end
+					device i2c 55 on end
+					device i2c 56 on end
+					device i2c 57 on end
+					device i2c 5c on end
+					device i2c 5d on end
+					device i2c 5e on end
+					device i2c 5f on end
+				end
+			end # SMBus Controller
+			device pci 1f.5 off end # SATA Controller 2
+			device pci 1f.6 on
+				subsystemid 0x17aa 0x21ce
+			end # Thermal
+		end
+	end
+end
diff --git a/src/mainboard/lenovo/t420/dsdt.asl b/src/mainboard/lenovo/t420/dsdt.asl
new file mode 100644
index 0000000000..aaa033840f
--- /dev/null
+++ b/src/mainboard/lenovo/t420/dsdt.asl
@@ -0,0 +1,64 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2007-2009 coresystems GmbH
+ * Copyright (C) 2011 The ChromiumOS Authors.  All rights reserved.
+ * Copyright (C) 2014 Vladimir Serbinenko
+ *
+ * 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 THINKPAD_EC_GPE 17
+#define BRIGHTNESS_UP \_SB.PCI0.GFX0.INCB
+#define BRIGHTNESS_DOWN \_SB.PCI0.GFX0.DECB
+#define ACPI_VIDEO_DEVICE \_SB.PCI0.GFX0
+#define EC_LENOVO_H8_ME_WORKAROUND 1
+
+DefinitionBlock(
+	"dsdt.aml",
+	"DSDT",
+	0x02,		// DSDT revision: ACPI v2.0
+	"COREv4",	// OEM id
+	"COREBOOT",	// OEM table id
+	0x20110725	// OEM revision
+)
+{
+	#include <southbridge/intel/bd82x6x/acpi/platform.asl>
+
+	// Some generic macros
+	#include "acpi/platform.asl"
+
+	// global NVS and variables
+	#include <southbridge/intel/bd82x6x/acpi/globalnvs.asl>
+
+	#include <cpu/intel/model_206ax/acpi/cpu.asl>
+
+	Scope (\_SB) {
+		Device (PCI0)
+		{
+			#include <northbridge/intel/sandybridge/acpi/sandybridge.asl>
+			#include <southbridge/intel/bd82x6x/acpi/pch.asl>
+			#include <southbridge/intel/bd82x6x/acpi/default_irq_route.asl>
+
+			#include <drivers/intel/gma/acpi/default_brightness_levels.asl>
+		}
+	}
+
+	/*
+	 * LPC Trusted Platform Module
+	 */
+	Scope (\_SB.PCI0.LPCB)
+	{
+		#include <drivers/pc80/tpm/acpi/tpm.asl>
+	}
+
+	/* Chipset specific sleep states */
+	#include <southbridge/intel/bd82x6x/acpi/sleepstates.asl>
+}
diff --git a/src/mainboard/lenovo/t420/gpio.c b/src/mainboard/lenovo/t420/gpio.c
new file mode 100644
index 0000000000..28a510204e
--- /dev/null
+++ b/src/mainboard/lenovo/t420/gpio.c
@@ -0,0 +1,291 @@
+#include <southbridge/intel/common/gpio.h>
+
+static const struct pch_gpio_set1 pch_gpio_set1_mode = {
+	.gpio0  = GPIO_MODE_GPIO,   // -USB30_SMIB - input
+	.gpio1  = GPIO_MODE_GPIO,   // -EC_SCI - input
+	.gpio2  = GPIO_MODE_GPIO,   // -LCD_PRESENCE - input
+	.gpio3  = GPIO_MODE_GPIO,   // DOCKID0 - input
+	.gpio4  = GPIO_MODE_GPIO,   // DOCKID1 - input
+	.gpio5  = GPIO_MODE_GPIO,   // DOCKID2 - input
+	.gpio6  = GPIO_MODE_GPIO,   // SYSTEM_DP_HPD - input
+	.gpio7  = GPIO_MODE_GPIO,   // pullup
+	.gpio8  = GPIO_MODE_GPIO,   // pulldown - INTEGRATED ENABLED(FCIM) 0 / DISABLED (BTM) 1
+	.gpio9  = GPIO_MODE_NATIVE, // OC5 - -USB_PORT9_OC5 - input
+	.gpio10 = GPIO_MODE_GPIO,   // DRAMRST_GATE_ON - output
+	.gpio11 = GPIO_MODE_NATIVE, // SMBALERT# pullup
+	.gpio12 = GPIO_MODE_NATIVE, // LANPHYPC - output
+	.gpio13 = GPIO_MODE_GPIO,   // -EC_WAKE - input
+	.gpio14 = GPIO_MODE_NATIVE, // OC7 - pullup
+	.gpio15 = GPIO_MODE_GPIO,   // pullup - ME CRYPTO STRAP WITH TLS CONFIDENTIALITY
+	.gpio16 = GPIO_MODE_NATIVE, // SATA4GP - SATA_DOCK_DTCT - input from gpio33
+	.gpio17 = GPIO_MODE_GPIO,   // DGFX_PW RGD - input
+	.gpio18 = GPIO_MODE_NATIVE, // PCIECLKRQ1 - -CLKREQ_WLAN - input
+	.gpio19 = GPIO_MODE_NATIVE, // SATA1GP - SATA_BAY_DTCT - input to gpio22
+	.gpio20 = GPIO_MODE_NATIVE, // PCIECLKRQ2 - pullup
+	.gpio21 = GPIO_MODE_GPIO,   // -DISCRETE_GFX_PRESENCE - input
+	.gpio22 = GPIO_MODE_GPIO,   // SATA_BAY_DTCT - output to SATA1GP
+	.gpio23 = GPIO_MODE_NATIVE, // LDRQ1 - TP84
+	.gpio24 = GPIO_MODE_GPIO,   // pullup
+	.gpio25 = GPIO_MODE_NATIVE, // PCIECLKRQ3 - -CLKREQ_EXC - input
+	.gpio26 = GPIO_MODE_NATIVE, // PCIECLKRQ4 - pullup
+	.gpio27 = GPIO_MODE_GPIO,   // -MSATA_DTCT - input
+	.gpio28 = GPIO_MODE_GPIO,   // pulldown possible
+	.gpio29 = GPIO_MODE_GPIO,   // SLP_LAN - -PCH_SLP_LAN
+	.gpio30 = GPIO_MODE_NATIVE, // SUSPWRDNACK - output
+	.gpio31 = GPIO_MODE_NATIVE, // ACPRESENT - input
+};
+
+static const struct pch_gpio_set1 pch_gpio_set1_direction = {
+	.gpio0  = GPIO_DIR_INPUT,
+	.gpio1  = GPIO_DIR_INPUT,
+	.gpio2  = GPIO_DIR_INPUT,
+	.gpio3  = GPIO_DIR_INPUT,
+	.gpio4  = GPIO_DIR_INPUT,
+	.gpio5  = GPIO_DIR_INPUT,
+	.gpio6  = GPIO_DIR_INPUT,
+	.gpio7  = GPIO_DIR_INPUT,
+	.gpio8  = GPIO_DIR_OUTPUT,
+	.gpio9  = GPIO_DIR_INPUT,
+	.gpio10 = GPIO_DIR_OUTPUT,
+	.gpio11 = GPIO_DIR_INPUT,
+	.gpio12 = GPIO_DIR_OUTPUT,
+	.gpio13 = GPIO_DIR_INPUT,
+	.gpio14 = GPIO_DIR_INPUT,
+	.gpio15 = GPIO_DIR_OUTPUT,
+	.gpio16 = GPIO_DIR_INPUT,
+	.gpio17 = GPIO_DIR_INPUT,
+	.gpio18 = GPIO_DIR_INPUT,
+	.gpio19 = GPIO_DIR_INPUT,
+	.gpio20 = GPIO_DIR_INPUT,
+	.gpio21 = GPIO_DIR_INPUT,
+	.gpio22 = GPIO_DIR_OUTPUT,
+	.gpio23 = GPIO_DIR_INPUT,
+	.gpio24 = GPIO_DIR_OUTPUT,
+	.gpio25 = GPIO_DIR_INPUT,
+	.gpio26 = GPIO_DIR_INPUT,
+	.gpio27 = GPIO_DIR_OUTPUT,
+	.gpio28 = GPIO_DIR_OUTPUT,
+	.gpio29 = GPIO_DIR_OUTPUT,
+	.gpio30 = GPIO_DIR_OUTPUT,
+	.gpio31 = GPIO_DIR_INPUT,
+};
+
+static const struct pch_gpio_set1 pch_gpio_set1_level = {
+	.gpio0  = GPIO_LEVEL_HIGH,
+	.gpio1  = GPIO_LEVEL_HIGH,
+	.gpio2  = GPIO_LEVEL_LOW,
+	.gpio3  = GPIO_LEVEL_HIGH,
+	.gpio4  = GPIO_LEVEL_HIGH,
+	.gpio5  = GPIO_LEVEL_HIGH,
+	.gpio6  = GPIO_LEVEL_LOW,
+	.gpio7  = GPIO_LEVEL_HIGH,
+	.gpio8  = GPIO_LEVEL_HIGH,
+	.gpio9  = GPIO_LEVEL_HIGH,
+	.gpio10 = GPIO_LEVEL_HIGH,
+	.gpio11 = GPIO_LEVEL_HIGH,
+	.gpio12 = GPIO_LEVEL_HIGH,
+	.gpio13 = GPIO_LEVEL_HIGH,
+	.gpio14 = GPIO_LEVEL_HIGH,
+	.gpio15 = GPIO_LEVEL_LOW,
+	.gpio16 = GPIO_LEVEL_HIGH,
+	.gpio17 = GPIO_LEVEL_LOW,
+	.gpio18 = GPIO_LEVEL_HIGH,
+	.gpio19 = GPIO_LEVEL_LOW,
+	.gpio20 = GPIO_LEVEL_HIGH,
+	.gpio21 = GPIO_LEVEL_LOW,
+	.gpio22 = GPIO_LEVEL_LOW,
+	.gpio23 = GPIO_LEVEL_HIGH,
+	.gpio24 = GPIO_LEVEL_LOW,
+	.gpio25 = GPIO_LEVEL_HIGH,
+	.gpio26 = GPIO_LEVEL_HIGH,
+	.gpio27 = GPIO_LEVEL_HIGH,
+	.gpio28 = GPIO_LEVEL_LOW,
+	.gpio29 = GPIO_LEVEL_HIGH,
+	.gpio30 = GPIO_LEVEL_HIGH,
+	.gpio31 = GPIO_LEVEL_HIGH,
+};
+
+static const struct pch_gpio_set1 pch_gpio_set1_invert = {
+	.gpio1  = GPIO_INVERT,
+	.gpio7  = GPIO_INVERT,
+	.gpio13 = GPIO_INVERT,
+};
+
+static const struct pch_gpio_set1 pch_gpio_set1_blink = {
+	.gpio18 = GPIO_NO_BLINK,
+};
+
+static const struct pch_gpio_set1 pch_gpio_set1_reset = {
+	.gpio24 = GPIO_RESET_RSMRST,
+};
+
+static const struct pch_gpio_set2 pch_gpio_set2_mode = {
+	.gpio32 = GPIO_MODE_NATIVE, // CLKRUN - output
+	.gpio33 = GPIO_MODE_GPIO,   // SATA_DOCK_DTCT - output to SATA4GP
+	.gpio34 = GPIO_MODE_GPIO,   // DGFX_VRM_ID - input - HIGH: 1GB / LOW: 2GB
+	.gpio35 = GPIO_MODE_GPIO,   // pullup
+	.gpio36 = GPIO_MODE_GPIO,   // pulldown
+	.gpio37 = GPIO_MODE_NATIVE, // SATA2GP - eSATA_DTCT - input to gpio
+	.gpio38 = GPIO_MODE_GPIO,   // planarid2 - input - pulldown
+	.gpio39 = GPIO_MODE_GPIO,   // planarid3 - input - pulldown
+	.gpio40 = GPIO_MODE_NATIVE, // OC1 - -USB_PORT1_OC1 - input
+	.gpio41 = GPIO_MODE_GPIO,   // OC2 - -USB_PORTX_OC2 - input
+	.gpio42 = GPIO_MODE_GPIO,   // SMB_3B_EN - output
+	.gpio43 = GPIO_MODE_NATIVE, // OC4 - pullup
+	.gpio44 = GPIO_MODE_NATIVE, // PCIECLKRQ5 - -CLKREQ_GBE - input
+	.gpio45 = GPIO_MODE_NATIVE, // PCIECLKRQ6 - -CLKREQ_USB30_TR - input
+	.gpio46 = GPIO_MODE_NATIVE, // PCIECLKRQ7 - pullup
+	.gpio47 = GPIO_MODE_NATIVE, // PEG_A_CLKRQ# - input
+	.gpio48 = GPIO_MODE_GPIO,   // planarid0 - input - PDV low / FVT high
+	.gpio49 = GPIO_MODE_GPIO,   // planarid1 - input - pulldown
+	.gpio50 = GPIO_MODE_GPIO,   // -SC_DTCT - input
+	.gpio51 = GPIO_MODE_GPIO,   // pullup
+	.gpio52 = GPIO_MODE_GPIO,   // OPTIMUS_ENABLE - output - high: igpu / low: dgpu
+	.gpio53 = GPIO_MODE_GPIO,   // pullup
+	.gpio54 = GPIO_MODE_GPIO,   // -BDC_PRESENCE - input
+	.gpio55 = GPIO_MODE_GPIO,   // pullup
+	.gpio56 = GPIO_MODE_NATIVE, // PEG_B_CLKRQ - pullup
+	.gpio57 = GPIO_MODE_GPIO,   // -DTPM_PRESENCE - input
+	.gpio58 = GPIO_MODE_NATIVE, // SML1CLK - EC_SCL2 - output
+	.gpio59 = GPIO_MODE_NATIVE, // OC0 - pullup
+	.gpio60 = GPIO_MODE_NATIVE, // SML0ALERT# - pullup
+	.gpio61 = GPIO_MODE_NATIVE, // SUS_STAT - output
+	.gpio62 = GPIO_MODE_NATIVE, // SUSCLK - output
+	.gpio63 = GPIO_MODE_NATIVE, // SLP_S5 - output
+};
+
+static const struct pch_gpio_set2 pch_gpio_set2_direction = {
+	.gpio32 = GPIO_DIR_INPUT,
+	.gpio33 = GPIO_DIR_OUTPUT,
+	.gpio34 = GPIO_DIR_INPUT,
+	.gpio35 = GPIO_DIR_OUTPUT,
+	.gpio36 = GPIO_DIR_INPUT,
+	.gpio37 = GPIO_DIR_INPUT,
+	.gpio38 = GPIO_DIR_INPUT,
+	.gpio39 = GPIO_DIR_INPUT,
+	.gpio40 = GPIO_DIR_INPUT,
+	.gpio41 = GPIO_DIR_OUTPUT,
+	.gpio42 = GPIO_DIR_OUTPUT,
+	.gpio43 = GPIO_DIR_INPUT,
+	.gpio44 = GPIO_DIR_INPUT,
+	.gpio45 = GPIO_DIR_INPUT,
+	.gpio46 = GPIO_DIR_INPUT,
+	.gpio47 = GPIO_DIR_INPUT,
+	.gpio48 = GPIO_DIR_INPUT,
+	.gpio49 = GPIO_DIR_INPUT,
+	.gpio50 = GPIO_DIR_INPUT,
+	.gpio51 = GPIO_DIR_OUTPUT,
+	.gpio52 = GPIO_DIR_OUTPUT,
+	.gpio53 = GPIO_DIR_OUTPUT,
+	.gpio54 = GPIO_DIR_INPUT,
+	.gpio55 = GPIO_DIR_OUTPUT,
+	.gpio56 = GPIO_DIR_INPUT,
+	.gpio57 = GPIO_DIR_INPUT,
+	.gpio58 = GPIO_DIR_INPUT,
+	.gpio59 = GPIO_DIR_INPUT,
+	.gpio60 = GPIO_DIR_INPUT,
+	.gpio61 = GPIO_DIR_OUTPUT,
+	.gpio62 = GPIO_DIR_OUTPUT,
+	.gpio63 = GPIO_DIR_OUTPUT,
+};
+
+static const struct pch_gpio_set2 pch_gpio_set2_level = {
+	.gpio32 = GPIO_LEVEL_HIGH,
+	.gpio33 = GPIO_LEVEL_HIGH,
+	.gpio34 = GPIO_LEVEL_HIGH,
+	.gpio35 = GPIO_LEVEL_LOW,
+	.gpio36 = GPIO_LEVEL_LOW,
+	.gpio37 = GPIO_LEVEL_LOW,
+	.gpio38 = GPIO_LEVEL_HIGH,
+	.gpio39 = GPIO_LEVEL_LOW,
+	.gpio40 = GPIO_LEVEL_HIGH,
+	.gpio41 = GPIO_LEVEL_HIGH,
+	.gpio42 = GPIO_LEVEL_HIGH,
+	.gpio43 = GPIO_LEVEL_HIGH,
+	.gpio44 = GPIO_LEVEL_HIGH,
+	.gpio45 = GPIO_LEVEL_HIGH,
+	.gpio46 = GPIO_LEVEL_HIGH,
+	.gpio47 = GPIO_LEVEL_HIGH,
+	.gpio48 = GPIO_LEVEL_HIGH,
+	.gpio49 = GPIO_LEVEL_HIGH,
+	.gpio50 = GPIO_LEVEL_HIGH,
+	.gpio51 = GPIO_LEVEL_HIGH,
+	.gpio52 = GPIO_LEVEL_HIGH,
+	.gpio53 = GPIO_LEVEL_HIGH,
+	.gpio54 = GPIO_LEVEL_LOW,
+	.gpio55 = GPIO_LEVEL_HIGH,
+	.gpio56 = GPIO_LEVEL_HIGH,
+	.gpio57 = GPIO_LEVEL_LOW,
+	.gpio58 = GPIO_LEVEL_HIGH,
+	.gpio59 = GPIO_LEVEL_HIGH,
+	.gpio60 = GPIO_LEVEL_HIGH,
+	.gpio61 = GPIO_LEVEL_HIGH,
+	.gpio62 = GPIO_LEVEL_HIGH,
+	.gpio63 = GPIO_LEVEL_HIGH,
+};
+
+static const struct pch_gpio_set3 pch_gpio_set3_mode = {
+	.gpio64 = GPIO_MODE_NATIVE, // NC
+	.gpio65 = GPIO_MODE_NATIVE, // VIDEO_CLK_27M_NSS - output
+	.gpio66 = GPIO_MODE_NATIVE, // NC
+	.gpio67 = GPIO_MODE_NATIVE, // VIDEO_CLK_27M_SS - output
+	.gpio68 = GPIO_MODE_GPIO,   // -INT_MIC_DTCT - input
+	.gpio69 = GPIO_MODE_GPIO,   // mic enable bit - low enable - pulldown
+	.gpio70 = GPIO_MODE_GPIO,   // pullup
+	.gpio71 = GPIO_MODE_GPIO,   // pullup
+	.gpio72 = GPIO_MODE_NATIVE, // BATLOW - input
+	.gpio73 = GPIO_MODE_NATIVE, // pullup
+	.gpio74 = GPIO_MODE_NATIVE, // pullup
+	.gpio75 = GPIO_MODE_NATIVE, // SML1DATA - EC_SDA2 - i/o
+};
+
+static const struct pch_gpio_set3 pch_gpio_set3_direction = {
+	.gpio64 = GPIO_DIR_OUTPUT,
+	.gpio65 = GPIO_DIR_OUTPUT,
+	.gpio66 = GPIO_DIR_OUTPUT,
+	.gpio67 = GPIO_DIR_OUTPUT,
+	.gpio68 = GPIO_DIR_INPUT,
+	.gpio69 = GPIO_DIR_INPUT,
+	.gpio70 = GPIO_DIR_INPUT,
+	.gpio71 = GPIO_DIR_INPUT,
+	.gpio72 = GPIO_DIR_INPUT,
+	.gpio73 = GPIO_DIR_INPUT,
+	.gpio74 = GPIO_DIR_INPUT,
+	.gpio75 = GPIO_DIR_INPUT,
+};
+
+static const struct pch_gpio_set3 pch_gpio_set3_level = {
+	.gpio64 = GPIO_LEVEL_HIGH,
+	.gpio65 = GPIO_LEVEL_HIGH,
+	.gpio66 = GPIO_LEVEL_HIGH,
+	.gpio67 = GPIO_LEVEL_HIGH,
+	.gpio68 = GPIO_LEVEL_LOW,
+	.gpio69 = GPIO_LEVEL_LOW,
+	.gpio70 = GPIO_LEVEL_LOW,
+	.gpio71 = GPIO_LEVEL_HIGH,
+	.gpio72 = GPIO_LEVEL_HIGH,
+	.gpio73 = GPIO_LEVEL_HIGH,
+	.gpio74 = GPIO_LEVEL_HIGH,
+	.gpio75 = GPIO_LEVEL_HIGH,
+};
+
+const struct pch_gpio_map mainboard_gpio_map = {
+	.set1 = {
+		.mode		= &pch_gpio_set1_mode,
+		.direction	= &pch_gpio_set1_direction,
+		.level		= &pch_gpio_set1_level,
+		.invert		= &pch_gpio_set1_invert,
+		.blink		= &pch_gpio_set1_blink,
+		.reset		= &pch_gpio_set1_reset,
+	},
+	.set2 = {
+		.mode		= &pch_gpio_set2_mode,
+		.direction	= &pch_gpio_set2_direction,
+		.level		= &pch_gpio_set2_level,
+	},
+	.set3 = {
+		.mode		= &pch_gpio_set3_mode,
+		.direction	= &pch_gpio_set3_direction,
+		.level		= &pch_gpio_set3_level,
+	},
+};
diff --git a/src/mainboard/lenovo/t420/hda_verb.c b/src/mainboard/lenovo/t420/hda_verb.c
new file mode 100644
index 0000000000..18a61a2436
--- /dev/null
+++ b/src/mainboard/lenovo/t420/hda_verb.c
@@ -0,0 +1,69 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2011 The ChromiumOS Authors.  All rights reserved.
+ * Copyright (C) 2014 Vladimir Serbinenko
+ *
+ * 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.
+ */
+
+/*	Vendor Name    : Conexant
+ *	Vendor ID      : 0x14f1506e
+ *	Subsystem ID   : 0x17aa21d2
+ *	Revision ID    : 0x100002
+ */
+
+
+#include <device/azalia_device.h>
+
+const u32 cim_verb_data[] = {
+	/* coreboot specific header */
+	0x14f1506e,	// Codec Vendor / Device ID: Conexant CX20590 - Schematic show CX20672
+	0x17aa21ce,	// Subsystem ID
+	0x0000000d,	// Number of 4 dword sets
+
+/* Bits 31:28 - Codec Address */
+/* Bits 27:20 - NID */
+/* Bits 19:8 - Verb ID */
+/* Bits 7:0  - Payload */
+
+/* NID 0x01 - NodeInfo */
+	AZALIA_SUBVENDOR(0x0, 0x17AA21D2),
+
+	AZALIA_PIN_CFG(0x0, 0x12, 0x90a60140),
+	AZALIA_PIN_CFG(0x0, 0x14, 0x90170110),
+	AZALIA_PIN_CFG(0x0, 0x15, 0x03211020),
+	AZALIA_PIN_CFG(0x0, 0x17, 0x411111f0),
+	AZALIA_PIN_CFG(0x0, 0x18, 0x03a11830),
+	AZALIA_PIN_CFG(0x0, 0x19, 0x411111f0),
+	AZALIA_PIN_CFG(0x0, 0x1a, 0x411111f0),
+	AZALIA_PIN_CFG(0x0, 0x1b, 0x411111f0),
+	AZALIA_PIN_CFG(0x0, 0x1d, 0x40138205),
+	AZALIA_PIN_CFG(0x0, 0x1e, 0x411111f0),
+
+	/* Misc entries */
+		0x00B707C0, /* Enable PortB as Output with HP amp */
+		0x00D70740, /* Enable PortD as Output */
+		0x0017A200, /* Disable ClkEn of PortSenseTst */
+		0x0017C621, /* Slave Port - Port A used as microphone input for
+		                            combo Jack
+		               Master Port - Port B used for Jack Presence Detect
+		               Enable Combo Jack Detection */
+		0x0017A208, /* Enable ClkEn of PortSenseTst */
+		0x00170500, /* Set power state to D0 */
+		0x00170500, /* Padding */
+		0x00170500, /* Padding */
+};
+
+const u32 pc_beep_verbs[] = {
+	0x02177a00, /* Digital PCBEEP Gain: 0h=-9db, 1h=-6db ... 4h=+3db, 5h=+6db */
+};
+
+AZALIA_ARRAY_SIZES;
diff --git a/src/mainboard/lenovo/t420/mainboard.c b/src/mainboard/lenovo/t420/mainboard.c
new file mode 100644
index 0000000000..e2e02d46d5
--- /dev/null
+++ b/src/mainboard/lenovo/t420/mainboard.c
@@ -0,0 +1,46 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2007-2009 coresystems GmbH
+ * Copyright (C) 2011-2012 Google Inc.
+ * Copyright (C) 2014 Vladimir Serbinenko
+ *
+ * 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 <device/device.h>
+#include <drivers/intel/gma/int15.h>
+#include <southbridge/intel/bd82x6x/pch.h>
+#include <ec/lenovo/h8/h8.h>
+
+static void mainboard_init(device_t dev)
+{
+	/* init spi */
+	RCBA32(0x38c8) = 0x00002005;
+	RCBA32(0x38c4) = 0x00802005;
+	RCBA32(0x38c0) = 0x00000007;
+}
+
+static void mainboard_enable(device_t dev)
+{
+	dev->ops->init = mainboard_init;
+
+	install_intel_vga_int15_handler(GMA_INT15_ACTIVE_LFP_INT_LVDS,
+					GMA_INT15_PANEL_FIT_DEFAULT,
+					GMA_INT15_BOOT_DISPLAY_DEFAULT, 0);
+}
+
+void h8_mainboard_init_dock(void)
+{
+}
+
+struct chip_operations mainboard_ops = {
+	.enable_dev = mainboard_enable,
+};
diff --git a/src/mainboard/lenovo/t420/romstage.c b/src/mainboard/lenovo/t420/romstage.c
new file mode 100644
index 0000000000..ec5fec5e90
--- /dev/null
+++ b/src/mainboard/lenovo/t420/romstage.c
@@ -0,0 +1,75 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2007-2010 coresystems GmbH
+ * Copyright (C) 2011 The ChromiumOS Authors.  All rights reserved.
+ * Copyright (C) 2014 Vladimir Serbinenko
+ *
+ * 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 <northbridge/intel/sandybridge/raminit_native.h>
+#include <southbridge/intel/bd82x6x/pch.h>
+
+void pch_enable_lpc(void)
+{
+	/* EC Decode Range Port60/64, Port62/66 */
+	/* Enable EC, PS/2 Keyboard/Mouse */
+	pci_write_config16(PCH_LPC_DEV, LPC_EN,
+			   CNF2_LPC_EN | CNF1_LPC_EN | MC_LPC_EN | KBC_LPC_EN |
+			   COMA_LPC_EN);
+
+	pci_write_config32(PCH_LPC_DEV, LPC_GEN1_DEC, 0x7c1601);
+	pci_write_config32(PCH_LPC_DEV, LPC_GEN2_DEC, 0xc15e1);
+	pci_write_config32(PCH_LPC_DEV, LPC_GEN4_DEC, 0x0c06a1);
+
+	pci_write_config16(PCH_LPC_DEV, LPC_IO_DEC, 0x10);
+
+	pci_write_config32(PCH_LPC_DEV, 0xac, 0x80010000);
+}
+
+void rcba_config(void)
+{
+	/* Disable unused devices (board specific) */
+	RCBA32(FD) = 0x1ea51fe3;
+	RCBA32(BUC) = 0;
+}
+// OC3 set in bios to port 2-7, OC7 set in bios to port 10-13
+const struct southbridge_usb_port mainboard_usb_ports[] = {
+	{ 1, 1,  0 }, /* P0: system port 4, OC0 */
+	{ 1, 1,  1 }, /* P1: system port 2 (EHCI debug), OC 1 */
+	{ 1, 1, -1 }, /* P2: HALF MINICARD (WLAN) no oc */
+	{ 1, 0, -1 }, /* P3: WWAN, no OC */
+	{ 1, 0, -1 }, /* P4: smartcard, no OC */
+	{ 1, 1, -1 }, /* P5: ExpressCard, no OC */
+	{ 0, 0, -1 }, /* P6: empty */
+	{ 0, 0, -1 }, /* P7: empty */
+	{ 1, 1,  4 }, /* P8: system port 3, OC4*/
+	{ 1, 1,  5 }, /* P9: system port 1 (EHCI debug), OC 5 */
+	{ 1, 0, -1 }, /* P10: fingerprint reader, no OC */
+	{ 1, 0, -1 }, /* P11: bluetooth, no OC. */
+	{ 1, 1, -1 }, /* P12: docking, no OC */
+	{ 1, 1, -1 }, /* P13: camera (LCD), no OC */
+};
+
+void mainboard_get_spd(spd_raw_data *spd)
+{
+	read_spd(&spd[0], 0x50);
+	read_spd(&spd[2], 0x51);
+}
+
+void mainboard_early_init(int s3resume)
+{
+}
+
+void mainboard_config_superio(void)
+{
+}
diff --git a/src/mainboard/lenovo/t420/smihandler.c b/src/mainboard/lenovo/t420/smihandler.c
new file mode 100644
index 0000000000..23a98ddd83
--- /dev/null
+++ b/src/mainboard/lenovo/t420/smihandler.c
@@ -0,0 +1,101 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2008-2009 coresystems GmbH
+ * Copyright (C) 2014 Vladimir Serbinenko
+ *
+ * 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 <cpu/x86/smm.h>
+#include <ec/acpi/ec.h>
+#include <ec/lenovo/h8/h8.h>
+#include <southbridge/intel/bd82x6x/pch.h>
+
+#define GPE_EC_SCI	1
+#define GPE_EC_WAKE	13
+
+static void mainboard_smm_init(void)
+{
+	printk(BIOS_DEBUG, "initializing SMI\n");
+	/* Enable 0x1600/0x1600 register pair */
+	ec_set_bit(0x00, 0x05);
+}
+
+int mainboard_io_trap_handler(int smif)
+{
+	static int smm_initialized;
+
+	if (!smm_initialized) {
+		mainboard_smm_init();
+		smm_initialized = 1;
+	}
+
+	return 0;
+}
+
+static void mainboard_smi_handle_ec_sci(void)
+{
+	u8 status = inb(EC_SC);
+	u8 event;
+
+	if (!(status & EC_SCI_EVT))
+		return;
+
+	event = ec_query();
+	printk(BIOS_DEBUG, "EC event %02x\n", event);
+}
+
+void mainboard_smi_gpi(u32 gpi_sts)
+{
+	if (gpi_sts & (1 << GPE_EC_SCI))
+		mainboard_smi_handle_ec_sci();
+}
+
+int mainboard_smi_apmc(u8 data)
+{
+	switch (data) {
+		case APM_CNT_ACPI_ENABLE:
+			/* use 0x1600/0x1604 to prevent races with userspace */
+			ec_set_ports(0x1604, 0x1600);
+			/* route EC_SCI to SCI */
+			gpi_route_interrupt(GPE_EC_SCI, GPI_IS_SCI);
+			/* discard all events, and enable attention */
+			ec_write(0x80, 0x01);
+			break;
+		case APM_CNT_ACPI_DISABLE:
+			/* we have to use port 0x62/0x66, as 0x1600/0x1604 doesn't
+			   provide a EC query function */
+			ec_set_ports(0x66, 0x62);
+			/* route EC_SCI to SMI */
+			gpi_route_interrupt(GPE_EC_SCI, GPI_IS_SMI);
+			/* discard all events, and enable attention */
+			ec_write(0x80, 0x01);
+			break;
+		default:
+			break;
+	}
+	return 0;
+}
+
+void mainboard_smi_sleep(u8 slp_typ)
+{
+	if (slp_typ == 3) {
+		u8 ec_wake = ec_read(0x32);
+		/* If EC wake events are enabled, enable wake on EC WAKE GPE. */
+		if (ec_wake & 0x14) {
+			/* Redirect EC WAKE GPE to SCI. */
+			gpi_route_interrupt(GPE_EC_WAKE, GPI_IS_SCI);
+		}
+	}
+}
diff --git a/src/mainboard/lenovo/t420/thermal.h b/src/mainboard/lenovo/t420/thermal.h
new file mode 100644
index 0000000000..6ca5b2a672
--- /dev/null
+++ b/src/mainboard/lenovo/t420/thermal.h
@@ -0,0 +1,26 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2011 The Chromium OS Authors. All rights reserved.
+ * Copyright (C) 2014 Vladimir Serbinenko
+ *
+ * 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 T420_THERMAL_H
+#define T420_THERMAL_H
+
+/* Temperature which OS will shutdown at */
+#define CRITICAL_TEMPERATURE	100
+
+/* Temperature which OS will throttle CPU */
+#define PASSIVE_TEMPERATURE	90
+
+#endif