path: root/config/coreboot/default/patches/0061-WIP-OptiPlex-3050-Micro-port.patch

From 76a22c32d673f7e9afe66424512035586433a78c Mon Sep 17 00:00:00 2001
From: Mate Kukri <kukri.mate@gmail.com>
Date: Sun, 14 Jul 2024 14:24:12 +0100
Subject: [PATCH 1/1] [WIP] OptiPlex 3050 Micro port

- Boots Linux
- SMSC SCH5553 SIO/EC
  + Early EC init + HWM init implemented
  + Console on serial port tested
  + TODO: late HWM init for fan control (fan runs at low speed now)
- Realtek Gigabit LAN works
- WiFi slot works
- NVMe SSD slot works
- Extra: LPSS UART0
  + Stock FW sets undocumented power gating bit, RTC battery needs to
    be pulled for it to work.
  + Signals exposed on test points on the back of the board.
    FIXME: add documentation about this
- Needs 'deguard' to bypass BootGuard
  + See https://review.coreboot.org/plugins/gitiles/deguard
- TODO: HDA verbs
- TODO: USB ports
- TODO: Add VBT
- Currently limited to the Micro form factor, but others are very
  similar

Change-Id: I8d443e39ee684a4eaa19c835a945cfe569c051e2
Signed-off-by: Mate Kukri <kukri.mate@gmail.com>
---
 src/mainboard/dell/optiplex_3050/Kconfig      |  34 +++
 src/mainboard/dell/optiplex_3050/Kconfig.name |   4 +
 src/mainboard/dell/optiplex_3050/Makefile.mk  |   9 +
 src/mainboard/dell/optiplex_3050/acpi/ec.asl  |   3 +
 .../dell/optiplex_3050/acpi/superio.asl       |   3 +
 .../dell/optiplex_3050/board_info.txt         |   7 +
 src/mainboard/dell/optiplex_3050/bootblock.c  | 107 ++++++++
 src/mainboard/dell/optiplex_3050/cmos.default |   5 +
 src/mainboard/dell/optiplex_3050/cmos.layout  |  54 ++++
 .../dell/optiplex_3050/devicetree.cb          | 123 +++++++++
 src/mainboard/dell/optiplex_3050/dsdt.asl     |  27 ++
 .../dell/optiplex_3050/gma-mainboard.ads      |  19 ++
 .../dell/optiplex_3050/include/early_gpio.h   |  11 +
 .../dell/optiplex_3050/include/gpio.h         | 241 ++++++++++++++++++
 src/mainboard/dell/optiplex_3050/ramstage.c   |  17 ++
 src/mainboard/dell/optiplex_3050/romstage.c   |  26 ++
 src/mainboard/dell/optiplex_3050/sch5555_ec.c |  54 ++++
 src/mainboard/dell/optiplex_3050/sch5555_ec.h |  10 +
 18 files changed, 754 insertions(+)
 create mode 100644 src/mainboard/dell/optiplex_3050/Kconfig
 create mode 100644 src/mainboard/dell/optiplex_3050/Kconfig.name
 create mode 100644 src/mainboard/dell/optiplex_3050/Makefile.mk
 create mode 100644 src/mainboard/dell/optiplex_3050/acpi/ec.asl
 create mode 100644 src/mainboard/dell/optiplex_3050/acpi/superio.asl
 create mode 100644 src/mainboard/dell/optiplex_3050/board_info.txt
 create mode 100644 src/mainboard/dell/optiplex_3050/bootblock.c
 create mode 100644 src/mainboard/dell/optiplex_3050/cmos.default
 create mode 100644 src/mainboard/dell/optiplex_3050/cmos.layout
 create mode 100644 src/mainboard/dell/optiplex_3050/devicetree.cb
 create mode 100644 src/mainboard/dell/optiplex_3050/dsdt.asl
 create mode 100644 src/mainboard/dell/optiplex_3050/gma-mainboard.ads
 create mode 100644 src/mainboard/dell/optiplex_3050/include/early_gpio.h
 create mode 100644 src/mainboard/dell/optiplex_3050/include/gpio.h
 create mode 100644 src/mainboard/dell/optiplex_3050/ramstage.c
 create mode 100644 src/mainboard/dell/optiplex_3050/romstage.c
 create mode 100644 src/mainboard/dell/optiplex_3050/sch5555_ec.c
 create mode 100644 src/mainboard/dell/optiplex_3050/sch5555_ec.h

diff --git a/src/mainboard/dell/optiplex_3050/Kconfig b/src/mainboard/dell/optiplex_3050/Kconfig
new file mode 100644
index 0000000000..763acda0b2
--- /dev/null
+++ b/src/mainboard/dell/optiplex_3050/Kconfig
@@ -0,0 +1,34 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
+if BOARD_DELL_OPTIPLEX_3050
+
+config BOARD_SPECIFIC_OPTIONS
+	def_bool y
+	select BOARD_ROMSIZE_KB_16384
+	select HAVE_ACPI_RESUME
+	select HAVE_ACPI_TABLES
+	select HAVE_CMOS_DEFAULT
+	select HAVE_OPTION_TABLE
+	# select INTEL_GMA_HAVE_VBT
+	select MAINBOARD_HAS_LIBGFXINIT
+	select MAINBOARD_HAS_TPM2
+	select MAINBOARD_SUPPORTS_KABYLAKE_CPU
+	select MAINBOARD_SUPPORTS_SKYLAKE_CPU
+	select MEMORY_MAPPED_TPM
+	select SKYLAKE_SOC_PCH_H
+	select SOC_INTEL_KABYLAKE
+	select SUPERIO_SMSC_SCH555x
+
+config CBFS_SIZE
+	default 0x900000
+
+config MAINBOARD_DIR
+	default "dell/optiplex_3050"
+
+config MAINBOARD_PART_NUMBER
+	default "OptiPlex 3050 Micro"
+
+config DIMM_SPD_SIZE
+	default 512	# DDR4
+
+endif
diff --git a/src/mainboard/dell/optiplex_3050/Kconfig.name b/src/mainboard/dell/optiplex_3050/Kconfig.name
new file mode 100644
index 0000000000..14eab7f52c
--- /dev/null
+++ b/src/mainboard/dell/optiplex_3050/Kconfig.name
@@ -0,0 +1,4 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
+config BOARD_DELL_OPTIPLEX_3050
+	bool "OptiPlex 3050 Micro"
diff --git a/src/mainboard/dell/optiplex_3050/Makefile.mk b/src/mainboard/dell/optiplex_3050/Makefile.mk
new file mode 100644
index 0000000000..c078124332
--- /dev/null
+++ b/src/mainboard/dell/optiplex_3050/Makefile.mk
@@ -0,0 +1,9 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
+bootblock-y += bootblock.c
+bootblock-y += sch5555_ec.c
+
+romstage-y += romstage.c
+
+ramstage-y += ramstage.c
+ramstage-$(CONFIG_MAINBOARD_USE_LIBGFXINIT) += gma-mainboard.ads
diff --git a/src/mainboard/dell/optiplex_3050/acpi/ec.asl b/src/mainboard/dell/optiplex_3050/acpi/ec.asl
new file mode 100644
index 0000000000..16990d45f4
--- /dev/null
+++ b/src/mainboard/dell/optiplex_3050/acpi/ec.asl
@@ -0,0 +1,3 @@
+/* SPDX-License-Identifier: CC-PDDC */
+
+/* Please update the license if adding licensable material. */
diff --git a/src/mainboard/dell/optiplex_3050/acpi/superio.asl b/src/mainboard/dell/optiplex_3050/acpi/superio.asl
new file mode 100644
index 0000000000..16990d45f4
--- /dev/null
+++ b/src/mainboard/dell/optiplex_3050/acpi/superio.asl
@@ -0,0 +1,3 @@
+/* SPDX-License-Identifier: CC-PDDC */
+
+/* Please update the license if adding licensable material. */
diff --git a/src/mainboard/dell/optiplex_3050/board_info.txt b/src/mainboard/dell/optiplex_3050/board_info.txt
new file mode 100644
index 0000000000..47a4a3a4f3
--- /dev/null
+++ b/src/mainboard/dell/optiplex_3050/board_info.txt
@@ -0,0 +1,7 @@
+Category: desktop
+Board URL: https://www.dell.com/support/kbdoc/en-uk/000124265/dell-optiplex-3050-system-guide
+ROM package: SOIC-8
+ROM protocol: SPI
+ROM socketed: n
+Flashrom support: y
+Release year: 2017
diff --git a/src/mainboard/dell/optiplex_3050/bootblock.c b/src/mainboard/dell/optiplex_3050/bootblock.c
new file mode 100644
index 0000000000..10689c42a1
--- /dev/null
+++ b/src/mainboard/dell/optiplex_3050/bootblock.c
@@ -0,0 +1,107 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#include <bootblock_common.h>
+#include <device/pnp_ops.h>
+#include <soc/gpio.h>
+#include <superio/smsc/sch555x/sch555x.h>
+#include "include/early_gpio.h"
+#include "sch5555_ec.h"
+
+struct ec_init_entry {
+	uint16_t addr;
+	uint8_t val;
+};
+
+static void bootblock_ec_init(void)
+{
+	/*
+	 * Early EC init
+	 */
+
+	static const struct ec_init_entry init_table1[] = {
+		{0x08cc, 0x11}, {0x08d0, 0x11}, {0x088c, 0x10}, {0x0890, 0x10},
+		{0x0894, 0x10}, {0x0898, 0x12}, {0x089c, 0x12}, {0x08a0, 0x10},
+		{0x08a4, 0x12}, {0x08a8, 0x10}, {0x0820, 0x12}, {0x0824, 0x12},
+		{0x0878, 0x12}, {0x0880, 0x12}, {0x0884, 0x12}, {0x08e0, 0x12},
+		{0x08e4, 0x12}, {0x083c, 0x10}, {0x0840, 0x10}, {0x0844, 0x10},
+		{0x0848, 0x10}, {0x084c, 0x10}, {0x0850, 0x10}, {0x0814, 0x11},
+	};
+
+	for (size_t i = 0; i < ARRAY_SIZE(init_table1); ++i)
+		sch5555_mbox_write(2, init_table1[i].addr, init_table1[i].val);
+
+	static const struct ec_init_entry init_table2[] = {
+		{0x0040, 0x00}, {0x00f8, 0x10}, {0x00f9, 0x00}, {0x00f0, 0x30},
+		{0x00fa, 0x00}, {0x00fb, 0x00}, {0x00ea, 0x00}, {0x00eb, 0x00},
+		{0x00ef, 0x7c}, {0x0005, 0x0f}, {0x0014, 0x01}, {0x0018, 0x2f},
+		{0x0019, 0x2f}, {0x001a, 0x2f}, {0x001b, 0x2f}, {0x01d8, 0x01},
+		{0x0040, 0x11},
+	};
+
+	for (size_t i = 0; i < ARRAY_SIZE(init_table2); ++i)
+		sch5555_mbox_write(1, init_table2[i].addr, init_table2[i].val);
+
+	sch5555_mbox_write(1, 0x000b, 0x01);
+	sch5555_mbox_write(4, 0x001a, 0x04);
+	sch5555_mbox_write(4, 0x0028, 0x18);
+	sch5555_mbox_write(4, 0x001a, 0x00);
+	sch5555_mbox_write(1, 0x000b, 0x03);
+
+	/*
+	 * Early HWM init
+	 */
+
+	sch5555_mbox_read(1, 0xcb);
+	sch5555_mbox_read(1, 0xb8);
+
+	static const struct ec_init_entry hwm_init_table[] = {
+		{0x02fc, 0xa0}, {0x02fd, 0x32}, {0x0005, 0x77}, {0x0019, 0x2f},
+		{0x001a, 0x2f}, {0x008a, 0x33}, {0x008b, 0x33}, {0x008c, 0x33},
+		{0x00ba, 0x10}, {0x00d1, 0xff}, {0x00d6, 0xff}, {0x00db, 0xff},
+		{0x0048, 0x00}, {0x0049, 0x00}, {0x007a, 0x00}, {0x007b, 0x00},
+		{0x007c, 0x00}, {0x0080, 0x00}, {0x0081, 0x00}, {0x0082, 0x00},
+		{0x0083, 0xbb}, {0x0084, 0xb0}, {0x01a1, 0x88}, {0x01a4, 0x80},
+		{0x0088, 0x00}, {0x0089, 0x00}, {0x00a0, 0x02}, {0x00a1, 0x02},
+		{0x00a2, 0x02}, {0x00a4, 0x04}, {0x00a5, 0x04}, {0x00a6, 0x04},
+		{0x00ab, 0x00}, {0x00ad, 0x3f}, {0x00b7, 0x07}, {0x0062, 0x50},
+		{0x0000, 0x46}, {0x0000, 0x50}, {0x0000, 0x46}, {0x0000, 0x50},
+		{0x0000, 0x46}, {0x0000, 0x98}, {0x0059, 0x98}, {0x0061, 0x7c},
+		{0x01bc, 0x00}, {0x01bd, 0x00}, {0x01bb, 0x00}, {0x0085, 0xdd},
+		{0x0086, 0xdd}, {0x0087, 0x07}, {0x0090, 0x82}, {0x0091, 0x5e},
+		{0x0095, 0x5d}, {0x0096, 0xa9}, {0x0097, 0x00}, {0x009b, 0x00},
+		{0x00ae, 0x86}, {0x00af, 0x86}, {0x00b3, 0x67}, {0x00c4, 0xff},
+		{0x00c5, 0xff}, {0x00c9, 0xff}, {0x0040, 0x01}, {0x02fc, 0x00},
+		{0x02b3, 0x9a}, {0x02b4, 0x05}, {0x02cc, 0x01}, {0x02d0, 0x4c},
+		{0x02d2, 0x01}, {0x02db, 0x01}, {0x006f, 0x01}, {0x0070, 0x02},
+		{0x0071, 0x03}, {0x018b, 0x03}, {0x018c, 0x03}, {0x0015, 0x33},
+		{0x018b, 0x00}, {0x018c, 0x00}, {0x02f8, 0x5e}, {0x02f9, 0x01},
+	};
+
+	for (size_t i = 0; i < ARRAY_SIZE(hwm_init_table); ++i)
+		sch5555_mbox_write(1, hwm_init_table[i].addr, hwm_init_table[i].val);
+}
+
+
+#define SCH555x_IOBASE	0x2e
+#define GLOBAL_DEV	PNP_DEV(SCH555x_IOBASE, SCH555x_LDN_GLOBAL)
+#define SERIAL_DEV	PNP_DEV(SCH555x_IOBASE, SCH555x_LDN_UART1)
+
+void bootblock_mainboard_early_init(void)
+{
+	gpio_configure_pads(early_gpio_table, ARRAY_SIZE(early_gpio_table));
+
+	// Super I/O early init will map Runtime and EMI registers
+	sch555x_early_init(GLOBAL_DEV);
+
+	// Changes LED color among a few other things
+	outb(1, SCH555x_RUNTIME_IOBASE + SCH555x_RUNTIME_PME_STS);
+	outb(1, SCH555x_RUNTIME_IOBASE + SCH555x_RUNTIME_PME_EN);
+	outb(0xf, SCH555x_RUNTIME_IOBASE + SCH555x_RUNTIME_LED);
+	outb(1, SCH555x_RUNTIME_IOBASE + SCH555x_RUNTIME_UNK1);
+
+	// Perform bootblock EC initialization
+	bootblock_ec_init();
+
+	// Bootblock EC initialization is required for UART1 to work
+	sch555x_enable_serial(SERIAL_DEV, CONFIG_TTYS0_BASE);
+}
diff --git a/src/mainboard/dell/optiplex_3050/cmos.default b/src/mainboard/dell/optiplex_3050/cmos.default
new file mode 100644
index 0000000000..79961f43d8
--- /dev/null
+++ b/src/mainboard/dell/optiplex_3050/cmos.default
@@ -0,0 +1,5 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
+boot_option=Fallback
+debug_level=Debug
+power_on_after_fail=Disable
diff --git a/src/mainboard/dell/optiplex_3050/cmos.layout b/src/mainboard/dell/optiplex_3050/cmos.layout
new file mode 100644
index 0000000000..54a5147b7d
--- /dev/null
+++ b/src/mainboard/dell/optiplex_3050/cmos.layout
@@ -0,0 +1,54 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
+# -----------------------------------------------------------------
+entries
+
+#start-bit length  config config-ID	name
+
+# -----------------------------------------------------------------
+0	120	r	0	reserved_memory
+
+# -----------------------------------------------------------------
+# RTC_BOOT_BYTE (coreboot hardcoded)
+384	1	e	4	boot_option
+388	4	h	0	reboot_counter
+
+# -----------------------------------------------------------------
+# coreboot config options: console
+395	4	e	6	debug_level
+
+# coreboot config options: southbridge
+409	2	e	7	power_on_after_fail
+
+# coreboot config options: bootloader
+#Used by ChromeOS:
+416	128	r	0	vbnv
+
+# coreboot config options: check sums
+984	16	h	0	check_sum
+
+# -----------------------------------------------------------------
+
+enumerations
+
+#ID	value	text
+1	0	Disable
+1	1	Enable
+4	0	Fallback
+4	1	Normal
+6	0	Emergency
+6	1	Alert
+6	2	Critical
+6	3	Error
+6	4	Warning
+6	5	Notice
+6	6	Info
+6	7	Debug
+6	8	Spew
+7	0	Disable
+7	1	Enable
+7	2	Keep
+# -----------------------------------------------------------------
+checksums
+
+checksum 392 415 984
diff --git a/src/mainboard/dell/optiplex_3050/devicetree.cb b/src/mainboard/dell/optiplex_3050/devicetree.cb
new file mode 100644
index 0000000000..49b2d7f603
--- /dev/null
+++ b/src/mainboard/dell/optiplex_3050/devicetree.cb
@@ -0,0 +1,123 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
+chip soc/intel/skylake
+	register "deep_sx_config" = "DSX_EN_WAKE_PIN | DSX_EN_LAN_WAKE_PIN"
+
+	# Enable Enhanced Intel SpeedStep
+	register "eist_enable" = "1"
+
+	device cpu_cluster 0 on end
+
+	device domain 0 on
+		device ref igpu on
+			register "PrimaryDisplay" = "Display_iGFX"
+		end
+
+		device ref south_xhci on
+			register "usb2_ports" = "{
+				[0] = USB2_PORT_MID(OC0),
+				[1] = USB2_PORT_MID(OC0),
+				[2] = USB2_PORT_MID(OC4),
+				[3] = USB2_PORT_MID(OC4),
+				[4] = USB2_PORT_MID(OC2),
+				[5] = USB2_PORT_MID(OC2),
+				[6] = USB2_PORT_MID(OC0),
+				[7] = USB2_PORT_MID(OC0),
+				[8] = USB2_PORT_MID(OC0),
+				[9] = USB2_PORT_MID(OC0),
+				[10] = USB2_PORT_MID(OC1),
+				[11] = USB2_PORT_MID(OC1),
+				[12] = USB2_PORT_MID(OC_SKIP),
+				[13] = USB2_PORT_MID(OC_SKIP),
+			}"
+			register "usb3_ports" = "{
+				[0] = USB3_PORT_DEFAULT(OC0),
+				[1] = USB3_PORT_DEFAULT(OC0),
+				[2] = USB3_PORT_DEFAULT(OC3),
+				[3] = USB3_PORT_DEFAULT(OC3),
+				[4] = USB3_PORT_DEFAULT(OC1),
+				[5] = USB3_PORT_DEFAULT(OC1),
+				[6] = USB3_PORT_DEFAULT(OC_SKIP),
+				[7] = USB3_PORT_DEFAULT(OC_SKIP),
+				[8] = USB3_PORT_DEFAULT(OC_SKIP),
+				[9] = USB3_PORT_DEFAULT(OC_SKIP),
+			}"
+		end
+
+		# ME interface is 'off' to avoid HECI reset delay due to HAP
+		device ref heci1 off end
+
+		device ref sata on
+			register "SataSalpSupport" = "1"
+			register "SataPortsEnable[0]" = "1"
+		end
+
+		device ref pcie_rp21 on
+			register "PcieRpEnable[20]"                     = "1"
+			register "PcieRpClkReqSupport[20]"              = "1"
+			register "PcieRpClkReqNumber[20]"               = "3"
+			register "PcieRpAdvancedErrorReporting[20]"     = "1"
+			register "PcieRpLtrEnable[20]"                  = "1"
+			register "PcieRpClkSrcNumber[20]"               = "3"
+			register "PcieRpHotPlug[20]"                    = "1"
+		end
+
+		# Realtek LAN
+		device ref pcie_rp5 on
+			register "PcieRpEnable[4]"			= "1"
+			register "PcieRpClkReqSupport[4]"		= "0"
+			register "PcieRpHotPlug[4]"			= "0"
+		end
+
+		# M.2 WiFi
+		device ref pcie_rp8 on
+			register "PcieRpEnable[7]"			= "1"
+			register "PcieRpClkReqSupport[7]"		= "0"
+			register "PcieRpHotPlug[7]"			= "1"
+		end
+
+		# UART0 is exposed on test points on the bottom of the board
+		device ref uart0 on
+			register "SerialIoDevMode[PchSerialIoIndexUart0]" = "PchSerialIoPci"
+		end
+
+		device ref lpc_espi on
+			register "serirq_mode" = "SERIRQ_CONTINUOUS"
+
+			# I/O decode for EMI/Runtime registers
+			register "gen1_dec" = "0x007c0a01"
+
+			# SCH5553
+			chip superio/smsc/sch555x
+				device pnp 2e.0 on		# EMI
+					io 0x60 = 0xa00
+				end
+				device pnp 2e.1 off end		# 8042
+				device pnp 2e.7 on		# UART1
+					io 0x60 = 0x3f8
+					irq 0x0f = 2
+					irq 0x70 = 4
+				end
+				device pnp 2e.8 off end 	# UART2
+				device pnp 2e.c on		# LPC interface
+					io 0x60 = 0x2e
+				end
+				device pnp 2e.a on		# Runtime registers
+					io 0x60 = 0xa40
+				end
+				device pnp 2e.b  off end	# Floppy Controller
+				device pnp 2e.11 off end	# Parallel Port
+			end
+
+			chip drivers/pc80/tpm
+				device pnp 0c31.0 on end
+			end
+		end
+
+		device ref hda on
+			register "PchHdaVcType" = "Vc1"
+		end
+
+		device ref smbus on end
+	end
+end
diff --git a/src/mainboard/dell/optiplex_3050/dsdt.asl b/src/mainboard/dell/optiplex_3050/dsdt.asl
new file mode 100644
index 0000000000..9762f6ff74
--- /dev/null
+++ b/src/mainboard/dell/optiplex_3050/dsdt.asl
@@ -0,0 +1,27 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#include <acpi/acpi.h>
+DefinitionBlock(
+	"dsdt.aml",
+	"DSDT",
+	ACPI_DSDT_REV_2,
+	OEM_ID,
+	ACPI_TABLE_CREATOR,
+	0x20110725
+)
+{
+	#include <acpi/dsdt_top.asl>
+	#include <soc/intel/common/block/acpi/acpi/globalnvs.asl>
+	#include <cpu/intel/common/acpi/cpu.asl>
+
+	Scope (\_SB)
+	{
+		Device (PCI0)
+		{
+			#include <soc/intel/skylake/acpi/systemagent.asl>
+			#include <soc/intel/skylake/acpi/pch.asl>
+		}
+	}
+
+	#include <southbridge/intel/common/acpi/sleepstates.asl>
+}
diff --git a/src/mainboard/dell/optiplex_3050/gma-mainboard.ads b/src/mainboard/dell/optiplex_3050/gma-mainboard.ads
new file mode 100644
index 0000000000..cb4c22f285
--- /dev/null
+++ b/src/mainboard/dell/optiplex_3050/gma-mainboard.ads
@@ -0,0 +1,19 @@
+-- SPDX-License-Identifier: GPL-2.0-or-later
+
+with HW.GFX.GMA;
+with HW.GFX.GMA.Display_Probing;
+
+use HW.GFX.GMA;
+use HW.GFX.GMA.Display_Probing;
+
+private package GMA.Mainboard is
+
+   ports : constant Port_List :=
+      (HDMI1,  -- External HDMI
+       DP2,    -- External DP (native)
+       HDMI2,  -- External DP (DP++)
+       DP3,    -- Video I/O card: VGA (0PKGGG), DP (H64DC)
+       HDMI3,  -- Video I/O card: VGA (0PKGGG), DP (H64DC)
+       others => Disabled);
+
+end GMA.Mainboard;
diff --git a/src/mainboard/dell/optiplex_3050/include/early_gpio.h b/src/mainboard/dell/optiplex_3050/include/early_gpio.h
new file mode 100644
index 0000000000..17a16371e3
--- /dev/null
+++ b/src/mainboard/dell/optiplex_3050/include/early_gpio.h
@@ -0,0 +1,11 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#ifndef __OPTIPLEX_3050_EARLY_GPIO_H__
+#define __OPTIPLEX_3050_EARLY_GPIO_H__
+
+static const struct pad_config early_gpio_table[] = {
+	PAD_CFG_NF(GPP_C8, NONE, DEEP, NF1),	/* UART0_RXD */
+	PAD_CFG_NF(GPP_C9, NONE, DEEP, NF1),	/* UART0_TXD */
+};
+
+#endif
diff --git a/src/mainboard/dell/optiplex_3050/include/gpio.h b/src/mainboard/dell/optiplex_3050/include/gpio.h
new file mode 100644
index 0000000000..83293c32a9
--- /dev/null
+++ b/src/mainboard/dell/optiplex_3050/include/gpio.h
@@ -0,0 +1,241 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#ifndef __OPTIPLEX_3050_GPIO_H__
+#define __OPTIPLEX_3050_GPIO_H__
+
+static const struct pad_config gpio_table[] = {
+
+	/* ------- GPIO Community 0 ------- */
+
+	/* ------- GPIO Group GPP_A ------- */
+	PAD_CFG_NF(GPP_A0, UP_20K, PLTRST, NF1),			/* RCIN# */
+	PAD_CFG_NF(GPP_A1, UP_20K, PLTRST, NF1),			/* LAD0 */
+	PAD_CFG_NF(GPP_A2, UP_20K, PLTRST, NF1),			/* LAD1 */
+	PAD_CFG_NF(GPP_A3, UP_20K, PLTRST, NF1),			/* LAD2 */
+	PAD_CFG_NF(GPP_A4, UP_20K, PLTRST, NF1),			/* LAD3 */
+	PAD_CFG_NF(GPP_A5, NONE, PLTRST, NF1),				/* LFRAME# */
+	PAD_CFG_NF(GPP_A6, NONE, PLTRST, NF1),				/* SERIRQ */
+	PAD_CFG_GPI_TRIG_OWN(GPP_A7, NONE, DEEP, OFF, ACPI),		/* GPIO */
+	PAD_CFG_NF(GPP_A8, NONE, DEEP, NF1),				/* CLKRUN# */
+	PAD_CFG_NF(GPP_A9, NONE, PLTRST, NF1),				/* CLKOUT_LPC0 */
+	PAD_CFG_NF(GPP_A10, NONE, PLTRST, NF1),				/* CLKOUT_LPC1 */
+	PAD_CFG_NF(GPP_A11, UP_20K, DEEP, NF1),				/* PME# */
+	PAD_CFG_GPO(GPP_A12, 0, PLTRST),				/* GPIO */
+	PAD_CFG_NF(GPP_A13, NONE, PLTRST, NF1),				/* SUSWARN#/SUSPWRDNACK */
+	PAD_CFG_GPI_TRIG_OWN(GPP_A14, NONE, PLTRST, OFF, ACPI),		/* GPIO */
+	PAD_CFG_NF(GPP_A15, UP_20K, PLTRST, NF1),			/* SUS_ACK# */
+	PAD_CFG_GPO(GPP_A16, 0, PLTRST),				/* GPIO */
+	PAD_CFG_GPO(GPP_A17, 0, PLTRST),				/* GPIO */
+	PAD_CFG_GPO(GPP_A18, 0, PLTRST),				/* GPIO */
+	PAD_CFG_GPO(GPP_A19, 0, PLTRST),				/* GPIO */
+	PAD_CFG_GPO(GPP_A20, 0, PLTRST),				/* GPIO */
+	PAD_CFG_GPO(GPP_A21, 1, PLTRST),				/* GPIO */
+	PAD_CFG_GPO(GPP_A22, 0, PLTRST),				/* GPIO */
+	PAD_CFG_GPO(GPP_A23, 0, PLTRST),				/* GPIO */
+
+	/* ------- GPIO Group GPP_B ------- */
+	PAD_CFG_GPO(GPP_B0, 0, PLTRST),					/* GPIO */
+	PAD_CFG_GPO(GPP_B1, 0, PLTRST),					/* GPIO */
+	PAD_CFG_GPO(GPP_B2, 0, DEEP),					/* GPIO */
+	PAD_CFG_GPO(GPP_B3, 1, RSMRST),					/* GPIO (ME_CNTL, B3 -> LOW => HDA_SDO -> HIGH) */
+	PAD_CFG_GPI_TRIG_OWN(GPP_B4, NONE, DEEP, OFF, ACPI),		/* GPIO */
+	PAD_CFG_GPO(GPP_B5, 1, PLTRST),					/* GPIO */
+	PAD_CFG_GPO(GPP_B6, 1, PLTRST),					/* GPIO */
+	PAD_CFG_GPO(GPP_B7, 0, PLTRST),					/* GPIO */
+	PAD_CFG_GPI_TRIG_OWN(GPP_B8, NONE, PLTRST, OFF, ACPI),		/* GPIO */
+	PAD_CFG_GPO(GPP_B9, 0, PLTRST),					/* GPIO */
+	PAD_CFG_GPO(GPP_B10, 0, PLTRST),				/* GPIO */
+	PAD_CFG_GPI_TRIG_OWN(GPP_B11, NONE, PLTRST, OFF, ACPI),		/* GPIO */
+	PAD_CFG_NF(GPP_B12, NONE, PLTRST, NF1),				/* SLP_S0# */
+	PAD_CFG_NF(GPP_B13, NONE, PLTRST, NF1),				/* PLTRST# */
+	PAD_CFG_NF(GPP_B14, DN_20K, PLTRST, NF1),			/* SPKR */
+	PAD_CFG_GPO(GPP_B15, 1, PLTRST),				/* GPIO */
+	PAD_CFG_GPO(GPP_B16, 1, PLTRST),				/* GPIO */
+	PAD_CFG_GPO(GPP_B17, 0, PLTRST),				/* GPIO */
+	PAD_CFG_NF(GPP_B18, DN_20K, DEEP, NF1),				/* GSPIO_MOSI */
+	PAD_CFG_GPO(GPP_B19, 0, PLTRST),				/* GPIO */
+	PAD_CFG_GPO(GPP_B20, 1, DEEP),					/* GPIO */
+	PAD_CFG_GPO(GPP_B21, 0, DEEP),					/* GPIO */
+	PAD_CFG_NF(GPP_B22, DN_20K, DEEP, NF1),				/* GSPI1_MOSI */
+	PAD_CFG_NF(GPP_B23, DN_20K, DEEP, NF2),				/* PCHHOT# */
+
+	/* ------- GPIO Community 1 ------- */
+
+	/* ------- GPIO Group GPP_C ------- */
+	PAD_CFG_NF(GPP_C0, NONE, DEEP, NF1),				/* SMBCLK */
+	PAD_CFG_NF(GPP_C1, NONE, DEEP, NF1),				/* SMBDATA */
+	PAD_CFG_GPI_TRIG_OWN(GPP_C2, DN_20K, DEEP, OFF, ACPI),		/* GPIO */
+	PAD_CFG_NF(GPP_C3, NONE, PLTRST, NF1),				/* SML0CLK */
+	PAD_CFG_NF(GPP_C4, NONE, PLTRST, NF1),				/* SML0DATA */
+	PAD_CFG_GPI_TRIG_OWN(GPP_C5, DN_20K, DEEP, OFF, ACPI),		/* GPIO */
+	PAD_CFG_NF(GPP_C6, NONE, DEEP, NF1),				/* SML1CLK */
+	PAD_CFG_NF(GPP_C7, NONE, DEEP, NF1),				/* SML1DATA */
+	PAD_CFG_NF(GPP_C8, NONE, DEEP, NF1),				/* UART0_RXD */
+	PAD_CFG_NF(GPP_C9, NONE, DEEP, NF1),				/* UART0_TXD */
+	PAD_CFG_GPO(GPP_C10, 0, PLTRST),				/* GPIO */
+	PAD_CFG_GPO(GPP_C11, 0, PLTRST),				/* GPIO */
+	PAD_CFG_GPO(GPP_C12, 0, PLTRST),				/* GPIO */
+	PAD_CFG_GPO(GPP_C13, 0, PLTRST),				/* GPIO */
+	PAD_CFG_GPO(GPP_C14, 0, PLTRST),				/* GPIO */
+	PAD_CFG_GPO(GPP_C15, 0, PLTRST),				/* GPIO */
+	PAD_CFG_NF(GPP_C16, NONE, PLTRST, NF1),				/* I2C0_SDA */
+	PAD_CFG_NF(GPP_C17, NONE, PLTRST, NF1),				/* I2C0_SCL */
+	PAD_CFG_GPO(GPP_C18, 0, PLTRST),				/* GPIO */
+	PAD_CFG_GPO(GPP_C19, 0, PLTRST),				/* GPIO */
+	PAD_CFG_GPO(GPP_C20, 0, PLTRST),				/* GPIO */
+	PAD_CFG_GPO(GPP_C21, 0, PLTRST),				/* GPIO */
+	PAD_CFG_GPO(GPP_C22, 0, PLTRST),				/* GPIO */
+	PAD_CFG_GPI_SCI(GPP_C23, NONE, DEEP, EDGE_SINGLE, INVERT),	/* GPIO */
+
+	/* ------- GPIO Group GPP_D ------- */
+	PAD_CFG_GPO(GPP_D0, 0, PLTRST),					/* GPIO */
+	PAD_CFG_GPO(GPP_D1, 0, PLTRST),					/* GPIO */
+	PAD_CFG_GPO(GPP_D2, 0, PLTRST),					/* GPIO */
+	PAD_CFG_GPO(GPP_D3, 0, PLTRST),					/* GPIO */
+	PAD_CFG_GPO(GPP_D4, 0, PLTRST),					/* GPIO */
+	PAD_CFG_GPI_TRIG_OWN(GPP_D5, NONE, DEEP, OFF, ACPI),		/* GPIO */
+	PAD_CFG_GPO(GPP_D6, 0, DEEP),					/* GPIO */
+	PAD_CFG_GPO(GPP_D7, 0, PLTRST),					/* GPIO */
+	PAD_CFG_GPO(GPP_D8, 0, PLTRST),					/* GPIO */
+	PAD_CFG_GPO(GPP_D9, 0, PLTRST),					/* GPIO */
+	PAD_CFG_GPO(GPP_D10, 0, PLTRST),				/* GPIO */
+	PAD_CFG_GPO(GPP_D11, 0, PLTRST),				/* GPIO */
+	PAD_CFG_GPO(GPP_D12, 0, PLTRST),				/* GPIO */
+	PAD_CFG_GPO(GPP_D13, 0, PLTRST),				/* GPIO */
+	PAD_CFG_GPO(GPP_D14, 0, PLTRST),				/* GPIO */
+	PAD_CFG_GPO(GPP_D15, 0, PLTRST),				/* GPIO */
+	PAD_CFG_GPO(GPP_D16, 0, PLTRST),				/* GPIO */
+	PAD_CFG_GPO(GPP_D17, 0, PLTRST),				/* GPIO */
+	PAD_CFG_GPO(GPP_D18, 0, PLTRST),				/* GPIO */
+	PAD_CFG_GPO(GPP_D19, 0, PLTRST),				/* GPIO */
+	PAD_CFG_GPO(GPP_D20, 0, PLTRST),				/* GPIO */
+	PAD_CFG_GPO(GPP_D21, 0, PLTRST),				/* GPIO */
+	PAD_CFG_GPO(GPP_D22, 0, PLTRST),				/* GPIO */
+	PAD_CFG_GPO(GPP_D23, 0, PLTRST),				/* GPIO */
+
+	/* ------- GPIO Group GPP_E ------- */
+	PAD_CFG_NF(GPP_E0, NONE, DEEP, NF1),				/* SATAXPCIE0 */
+	PAD_CFG_NF(GPP_E1, NONE, DEEP, NF1),				/* SATAXPCIE1 */
+	PAD_CFG_NF(GPP_E2, NONE, DEEP, NF1),				/* SATAXPCIE2 */
+	PAD_CFG_GPO(GPP_E3, 0, DEEP),					/* GPIO */
+	PAD_CFG_GPO(GPP_E4, 0, DEEP),					/* GPIO */
+	PAD_CFG_GPO(GPP_E5, 0, PLTRST),					/* GPIO */
+	PAD_CFG_GPO(GPP_E6, 0, PLTRST),					/* GPIO */
+	PAD_CFG_GPI_TRIG_OWN(GPP_E7, NONE, DEEP, OFF, ACPI),		/* GPIO */
+	PAD_CFG_NF(GPP_E8, NONE, PLTRST, NF1),				/* SATA_LED# */
+	PAD_CFG_NF(GPP_E9, UP_20K, PLTRST, NF1),			/* USB_OC0# */
+	PAD_CFG_NF(GPP_E10, UP_20K, PLTRST, NF1),			/* USB_OC1# */
+	PAD_CFG_NF(GPP_E11, UP_20K, PLTRST, NF1),			/* USB_OC2# */
+	PAD_CFG_NF(GPP_E12, UP_20K, PLTRST, NF1),			/* USB_OC3# */
+
+	/* ------- GPIO Group GPP_F ------- */
+	PAD_CFG_NF(GPP_F0, NONE, DEEP, NF1),				/* SATAXPCIE3 */
+	PAD_CFG_NF(GPP_F1, NONE, DEEP, NF1),				/* SATAXPCIE4 */
+	PAD_CFG_NF(GPP_F2, NONE, DEEP, NF1),				/* SATAXPCIE5 */
+	PAD_CFG_NF(GPP_F3, NONE, DEEP, NF1),				/* SATAXPCIE6 */
+	PAD_CFG_NF(GPP_F4, NONE, DEEP, NF1),				/* SATAXPCIE7 */
+	PAD_CFG_GPI_TRIG_OWN(GPP_F5, NONE, PLTRST, OFF, ACPI),		/* GPIO */
+	PAD_CFG_NF(GPP_F6, NONE, RSMRST, NF1),				/* SATA_DEVSLP4 */
+	PAD_CFG_GPO(GPP_F7, 1, PLTRST),					/* GPIO */
+	PAD_CFG_GPI_TRIG_OWN(GPP_F8, NONE, DEEP, OFF, ACPI),		/* GPIO */
+	PAD_CFG_GPO(GPP_F9, 0, RSMRST),					/* GPIO */
+	PAD_CFG_GPI_TRIG_OWN(GPP_F10, NONE, DEEP, OFF, ACPI),		/* GPIO */
+	PAD_CFG_GPI_TRIG_OWN(GPP_F11, NONE, PLTRST, OFF, ACPI),		/* GPIO */
+	PAD_CFG_GPI_TRIG_OWN(GPP_F12, NONE, PLTRST, OFF, ACPI),		/* GPIO */
+	PAD_CFG_GPO(GPP_F13, 0, PLTRST),				/* GPIO */
+	PAD_CFG_GPI_TRIG_OWN(GPP_F14, NONE, DEEP, OFF, ACPI),		/* GPIO */
+	PAD_CFG_NF(GPP_F15, UP_20K, DEEP, NF1),				/* USB_OC4# */
+	PAD_CFG_NF(GPP_F16, UP_20K, DEEP, NF1),				/* USB_OC5# */
+	PAD_CFG_NF(GPP_F17, UP_20K, PLTRST, NF1),			/* USB_OC6# */
+	PAD_CFG_TERM_GPO(GPP_F18, 0, UP_20K, DEEP),			/* GPIO */
+	PAD_CFG_GPO(GPP_F19, 0, PLTRST),				/* GPIO */
+	PAD_CFG_GPO(GPP_F20, 1, DEEP),					/* GPIO */
+	PAD_CFG_GPO(GPP_F21, 1, PLTRST),				/* GPIO */
+	PAD_CFG_GPO(GPP_F22, 1, PLTRST),				/* GPIO */
+	PAD_CFG_GPO(GPP_F23, 1, RSMRST),				/* GPIO */
+
+	/* ------- GPIO Group GPP_G ------- */
+	PAD_CFG_GPI_TRIG_OWN(GPP_G0, NONE, PLTRST, OFF, ACPI),		/* GPIO */
+	PAD_CFG_GPI_TRIG_OWN(GPP_G1, NONE, PLTRST, OFF, ACPI),		/* GPIO */
+	PAD_CFG_GPI_TRIG_OWN(GPP_G2, NONE, PLTRST, OFF, ACPI),		/* GPIO */
+	PAD_CFG_GPI_TRIG_OWN(GPP_G3, NONE, PLTRST, OFF, ACPI),		/* GPIO */
+	PAD_CFG_GPI_TRIG_OWN(GPP_G4, NONE, PLTRST, OFF, ACPI),		/* GPIO */
+	PAD_CFG_GPI_TRIG_OWN(GPP_G5, NONE, PLTRST, OFF, ACPI),		/* GPIO */
+	PAD_CFG_GPI_TRIG_OWN(GPP_G6, NONE, PLTRST, OFF, ACPI),		/* GPIO */
+	PAD_CFG_GPI_TRIG_OWN(GPP_G7, NONE, PLTRST, OFF, ACPI),		/* GPIO */
+	PAD_CFG_GPI_TRIG_OWN(GPP_G8, NONE, PLTRST, OFF, ACPI),		/* GPIO */
+	PAD_CFG_GPO(GPP_G9, 1, PLTRST),					/* GPIO */
+	PAD_CFG_GPI_TRIG_OWN(GPP_G10, NONE, DEEP, OFF, ACPI),		/* GPIO */
+	PAD_CFG_GPI_TRIG_OWN(GPP_G11, NONE, DEEP, OFF, ACPI),		/* GPIO */
+	PAD_CFG_GPO(GPP_G12, 1, DEEP),					/* GPIO */
+	PAD_CFG_GPI_TRIG_OWN(GPP_G13, NONE, DEEP, OFF, ACPI),		/* GPIO */
+	PAD_CFG_GPO(GPP_G14, 0, DEEP),					/* GPIO */
+	PAD_CFG_GPO(GPP_G15, 1, DEEP),					/* GPIO */
+	PAD_CFG_GPO(GPP_G16, 1, DEEP),					/* GPIO */
+	PAD_CFG_GPO(GPP_G17, 1, DEEP),					/* GPIO */
+	PAD_CFG_GPO(GPP_G18, 0, PLTRST),				/* GPIO */
+	PAD_CFG_GPO(GPP_G19, 1, DEEP),					/* GPIO */
+	PAD_CFG_GPO(GPP_G20, 1, PLTRST),				/* GPIO */
+	PAD_CFG_GPO(GPP_G21, 0, DEEP),					/* GPIO */
+	PAD_CFG_GPO(GPP_G22, 0, DEEP),					/* GPIO */
+	PAD_CFG_GPO(GPP_G23, 0, PLTRST),				/* GPIO */
+
+	/* ------- GPIO Group GPP_H ------- */
+	PAD_CFG_GPO(GPP_H0, 0, DEEP),					/* GPIO */
+	PAD_CFG_GPO(GPP_H1, 1, PLTRST),					/* GPIO */
+	PAD_CFG_GPO(GPP_H2, 0, PLTRST),					/* GPIO */
+	PAD_CFG_GPO(GPP_H3, 0, PLTRST),					/* GPIO */
+	PAD_CFG_GPO(GPP_H4, 0, PLTRST),					/* GPIO */
+	PAD_CFG_GPO(GPP_H5, 0, PLTRST),					/* GPIO */
+	PAD_CFG_GPO(GPP_H6, 1, DEEP),					/* GPIO */
+	PAD_CFG_GPO(GPP_H7, 0, PLTRST),					/* GPIO */
+	PAD_CFG_GPO(GPP_H8, 0, PLTRST),					/* GPIO */
+	PAD_CFG_GPO(GPP_H9, 0, PLTRST),					/* GPIO */
+	PAD_CFG_GPO(GPP_H10, 0, PLTRST),				/* GPIO */
+	PAD_CFG_GPO(GPP_H11, 0, PLTRST),				/* GPIO */
+	PAD_CFG_TERM_GPO(GPP_H12, 1, DN_20K, DEEP),			/* GPIO */
+	PAD_CFG_GPO(GPP_H13, 1, PLTRST),				/* GPIO */
+	PAD_CFG_GPO(GPP_H14, 0, PLTRST),				/* GPIO */
+	PAD_CFG_GPO(GPP_H15, 0, PLTRST),				/* GPIO */
+	PAD_CFG_GPO(GPP_H16, 0, PLTRST),				/* GPIO */
+	PAD_CFG_GPO(GPP_H17, 0, PLTRST),				/* GPIO */
+	PAD_CFG_GPO(GPP_H18, 0, PLTRST),				/* GPIO */
+	PAD_CFG_GPO(GPP_H19, 0, PLTRST),				/* GPIO */
+	PAD_CFG_GPO(GPP_H20, 0, PLTRST),				/* GPIO */
+	PAD_CFG_GPO(GPP_H21, 0, PLTRST),				/* GPIO */
+	PAD_CFG_GPO(GPP_H22, 0, PLTRST),				/* GPIO */
+	PAD_CFG_GPO(GPP_H23, 0, PLTRST),				/* GPIO */
+
+	/* ------- GPIO Community 2 ------- */
+
+	/* -------- GPIO Group GPD -------- */
+	PAD_CFG_NF(GPD0, NONE, RSMRST, NF1),				/* BATLOW# */
+	PAD_CFG_GPO(GPD1, 0, PWROK),					/* GPIO */
+	PAD_CFG_NF(GPD2, NONE, RSMRST, NF1),				/* LAN_WAKE# */
+	PAD_CFG_NF(GPD3, UP_20K, RSMRST, NF1),				/* PWRBTN# */
+	PAD_CFG_NF(GPD4, NONE, RSMRST, NF1),				/* SLP_S3# */
+	PAD_CFG_NF(GPD5, NONE, RSMRST, NF1),				/* SLP_S4# */
+	PAD_CFG_NF(GPD6, NONE, RSMRST, NF1),				/* SLP_A# */
+	PAD_CFG_GPO(GPD7, 1, RSMRST),					/* GPIO */
+	PAD_CFG_NF(GPD8, NONE, RSMRST, NF1),				/* SUSCLK */
+	PAD_CFG_NF(GPD9, NONE, RSMRST, NF1),				/* SLP_WLAN# */
+	PAD_CFG_NF(GPD10, NONE, RSMRST, NF1),				/* SLP_S5# */
+	PAD_CFG_GPO(GPD11, 1, RSMRST),					/* GPIO */
+
+	/* ------- GPIO Community 3 ------- */
+
+	/* ------- GPIO Group GPP_I ------- */
+	PAD_CFG_NF(GPP_I0, NONE, PLTRST, NF1),				/* DDPB_HPD0 */
+	PAD_CFG_NF(GPP_I1, NONE, PLTRST, NF1),				/* DDPC_HPD1 */
+	PAD_CFG_NF(GPP_I2, NONE, PLTRST, NF1),				/* DDPD_HPD2 */
+	PAD_CFG_NF(GPP_I3, NONE, PLTRST, NF1),				/* DDPE_HPD3 */
+	PAD_CFG_NF(GPP_I4, NONE, PLTRST, NF1),				/* EDP_HPD */
+	PAD_CFG_NF(GPP_I5, NONE, PLTRST, NF1),				/* DDPB_CTRLCLK */
+	PAD_CFG_NF(GPP_I6, DN_20K, PLTRST, NF1),			/* DDPB_CTRLDATA */
+	PAD_CFG_NF(GPP_I7, NONE, PLTRST, NF1),				/* DDPC_CTRLCLK */
+	PAD_CFG_NF(GPP_I8, DN_20K, PLTRST, NF1),			/* DDPC_CTRLDATA */
+	PAD_CFG_NF(GPP_I9, NONE, PLTRST, NF1),				/* DDPD_CTRLCLK */
+	PAD_CFG_NF(GPP_I10, DN_20K, PLTRST, NF1),			/* DDPD_CTRLDATA */
+};
+
+#endif
diff --git a/src/mainboard/dell/optiplex_3050/ramstage.c b/src/mainboard/dell/optiplex_3050/ramstage.c
new file mode 100644
index 0000000000..0badd89620
--- /dev/null
+++ b/src/mainboard/dell/optiplex_3050/ramstage.c
@@ -0,0 +1,17 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#include <soc/ramstage.h>
+#include "include/gpio.h"
+
+void mainboard_silicon_init_params(FSP_SIL_UPD *params)
+{
+	gpio_configure_pads(gpio_table, ARRAY_SIZE(gpio_table));
+}
+
+static void init_mainboard(void *chip_info)
+{
+}
+
+struct chip_operations mainboard_ops = {
+	.init = init_mainboard,
+};
diff --git a/src/mainboard/dell/optiplex_3050/romstage.c b/src/mainboard/dell/optiplex_3050/romstage.c
new file mode 100644
index 0000000000..a4734e5d61
--- /dev/null
+++ b/src/mainboard/dell/optiplex_3050/romstage.c
@@ -0,0 +1,26 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#include <assert.h>
+#include <soc/romstage.h>
+#include <stdint.h>
+#include <string.h>
+#include <spd_bin.h>
+#include <cbfs.h>
+
+void mainboard_memory_init_params(FSPM_UPD *mupd)
+{
+	struct spd_block blk = { .addr_map = { 0x50, 0x52, } };
+	get_spd_smbus(&blk);
+	dump_spd_info(&blk);
+
+	FSP_M_CONFIG *mem_cfg = &mupd->FspmConfig;
+	mem_cfg->DqPinsInterleaved = true;
+	mem_cfg->CaVrefConfig      = 2;
+	mem_cfg->MemorySpdDataLen  = blk.len;
+	mem_cfg->MemorySpdPtr00    = (uintptr_t)blk.spd_array[0];
+	mem_cfg->MemorySpdPtr10    = (uintptr_t)blk.spd_array[1];
+
+	/* use virtual channel 1 for the dmi interface of the PCH
+	 * FIXME: do we need this? */
+	mupd->FspmTestConfig.DmiVc1 = 1;
+}
diff --git a/src/mainboard/dell/optiplex_3050/sch5555_ec.c b/src/mainboard/dell/optiplex_3050/sch5555_ec.c
new file mode 100644
index 0000000000..1df5026531
--- /dev/null
+++ b/src/mainboard/dell/optiplex_3050/sch5555_ec.c
@@ -0,0 +1,54 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#include <arch/io.h>
+#include <device/pnp_ops.h>
+#include <superio/smsc/sch555x/sch555x.h>
+#include "sch5555_ec.h"
+
+uint8_t sch5555_mbox_read(uint8_t addr1, uint16_t addr2)
+{
+	// clear ec-to-host mailbox
+	uint8_t tmp = inb(SCH555x_EMI_IOBASE + 1);
+	outb(tmp, SCH555x_EMI_IOBASE + 1);
+
+	// send address
+	outw(0 | 0x8001, SCH555x_EMI_IOBASE + 2);
+	outw((addr1 * 2) | 0x100, SCH555x_EMI_IOBASE + 4);
+
+	outw(4 | 0x8002, SCH555x_EMI_IOBASE + 2);
+	outl(addr2 << 16, SCH555x_EMI_IOBASE + 4);
+
+	// send message to ec
+	outb(1, SCH555x_EMI_IOBASE);
+
+	// wait for ack
+	for (size_t retry = 0; retry < 0xfff; ++retry)
+		if (inb(SCH555x_EMI_IOBASE + 1) & 1)
+			break;
+
+	// read result
+	outw(4 | 0x8000, SCH555x_EMI_IOBASE + 2);
+	return inb(SCH555x_EMI_IOBASE + 4);
+}
+
+void sch5555_mbox_write(uint8_t addr1, uint16_t addr2, uint8_t val)
+{
+	// clear ec-to-host mailbox
+	uint8_t tmp = inb(SCH555x_EMI_IOBASE + 1);
+	outb(tmp, SCH555x_EMI_IOBASE + 1);
+
+	// send address and value
+	outw(0 | 0x8001, SCH555x_EMI_IOBASE + 2);
+	outw((addr1 * 2) | 0x101, SCH555x_EMI_IOBASE + 4);
+
+	outw(4 | 0x8002, SCH555x_EMI_IOBASE + 2);
+	outl(val | (addr2 << 16), SCH555x_EMI_IOBASE + 4);
+
+	// send message to ec
+	outb(1, SCH555x_EMI_IOBASE);
+
+	// wait for ack
+	for (size_t retry = 0; retry < 0xfff; ++retry)
+		if (inb(SCH555x_EMI_IOBASE + 1) & 1)
+			break;
+}
diff --git a/src/mainboard/dell/optiplex_3050/sch5555_ec.h b/src/mainboard/dell/optiplex_3050/sch5555_ec.h
new file mode 100644
index 0000000000..9d262d5787
--- /dev/null
+++ b/src/mainboard/dell/optiplex_3050/sch5555_ec.h
@@ -0,0 +1,10 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#ifndef __SCH5555_EC_H__
+#define __SCH5555_EC_H__
+
+uint8_t sch5555_mbox_read(uint8_t addr1, uint16_t addr2);
+
+void sch5555_mbox_write(uint8_t addr1, uint16_t addr2, uint8_t val);
+
+#endif
-- 
2.39.5