mb/system76/adl-p: Add Darter Pro 8

The Darter Pro 8 (darp8) is an Alder Lake-P board.

Tested with a custom TianoCore UefiPayloadPkg.

Working:

- PS/2 keyboard, touchpad
- Both DIMM slots (with NMSO480E82-3200EA00)
- M.2 NVMe SSD (with MZVL2500HCJQ)
- M.2 SATA SSD (with WDS100T2B0B)
- All USB ports
- SD card reader
- Webcam
- Ethernet
- WiFi/Bluetooth
- Integrated graphics using Intel GOP driver
- Backlight controls on Windows 10 and Linux 6.1
- HDMI output
- DisplayPort output over USB-C
- Internal microphone
- Internal speakers
- Combined header + mic 3.5mm audio
- S0ix suspend/resume
- Booting Pop!_OS Linux 22.04 with kernel 5.18.5
- Internal flashing with flashrom v1.2-703-g76118a7c10ed

Not working:

- Detection of devices in TBT slot on boot

Change-Id: Icc84d6cc3aec7149d9b538305288bbe2b56d53e4
Signed-off-by: Tim Crawford <tcrawford@system76.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/65301
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>

23 files changed, 944 insertions, 0 deletions

diff --git a/Documentation/mainboard/index.md b/Documentation/mainboard/index.md
index 91ed2c8ba22f..6911d5cd077f 100644
--- a/Documentation/mainboard/index.md
+++ b/Documentation/mainboard/index.md
@@ -201,6 +201,7 @@ The boards in this section are not real mainboards, but emulators.
 - [Bonobo Workstation 14](system76/bonw14.md)
 - [Darter Pro 6](system76/darp6.md)
 - [Darter Pro 7](system76/darp7.md)
+- [Darter Pro 8](system76/darp8.md)
 - [Galago Pro 4](system76/galp4.md)
 - [Galago Pro 5](system76/galp5.md)
 - [Gazelle 15](system76/gaze15.md)
diff --git a/Documentation/mainboard/system76/darp8.md b/Documentation/mainboard/system76/darp8.md
new file mode 100644
index 000000000000..4d2da37876f3
--- /dev/null
+++ b/Documentation/mainboard/system76/darp8.md
@@ -0,0 +1,82 @@
+# Syste76 Darter Pro 8 (darp8)
+
+## Specs
+
+- CPU
+  - Intel Core i5-1240P
+  - Intel Core i7-1260P
+- EC
+  - ITE IT5570E running [System76 EC](https://github.com/system76/ec)
+- Graphics
+  - Intel Iris Xe Graphics
+  - eDP 15.6" 1920x1080@60Hz LCD
+  - 1x HDMI
+  - 1x DisplayPort 1.4 over USB-C
+- Memory
+  - Up to 64GB (2x32GB) dual-channel DDR4 SO-DIMMs @ 3200 MHz
+- Networking
+  - Gigabit Ethernet
+  - M.2 NVMe/CNVi WiFi/Bluetooth (Intel Wi-Fi 6 AX200/201)
+- Power
+  - 90W (19V, 4.74A) AC barrel adapter (Chicony A16-090P1A)
+  - USB-C charging, compatible with 65W+ chargers
+  - 73Wh 4-cell Lithium-ion battery (L140BAT-4)
+- Sound
+  - Realtek ALC256 codec
+  - Internal speakers and microphone
+  - Combined 3.5mm headphone/microphone jack
+  - HDMI, USB-C DisplayPort audio
+- Storage
+  - M.2 PCIe NVMe Gen 4 SSD
+  - M.2 PCIe NVMe Gen 3 or SATA 3 SSD
+  - MicroSD card reader (OZ711LV2)
+- USB
+  - 1x USB-C Type-C with Thunderbolt 4
+  - 1x USB 3.2 (Gen 2) Type-C
+  - 1x USB 3.2 (Gen 2) Type-A
+  - 1x USB 2.0 Type-A
+- Dimensions
+  - 35.7cm x 22.05cm x 1.99cm, 1.74kg
+
+## Flashing coreboot
+
+```eval_rst
++---------------------+---------------------+
+| Type                | Value               |
++=====================+=====================+
+| Socketed flash      | no                  |
++---------------------+---------------------+
+| Vendor              | GigaDevice          |
++---------------------+---------------------+
+| Model               | GD25B256E           |
++---------------------+---------------------+
+| Size                | 32 MiB              |
++---------------------+---------------------+
+| Package             | WSON-8              |
++---------------------+---------------------+
+| Internal flashing   | yes                 |
++---------------------+---------------------+
+| External flashing   | yes                 |
++---------------------+---------------------+
+```
+```eval_rst
++---------------------+---------------------+
+| Type                | Value               |
++=====================+=====================+
+| Socketed flash      | no                  |
++---------------------+---------------------+
+| Vendor              | Winbond             |
++---------------------+---------------------+
+| Model               | W25Q256.V           |
++---------------------+---------------------+
+| Size                | 32 MiB              |
++---------------------+---------------------+
+| Package             | WSON-8              |
++---------------------+---------------------+
+| Internal flashing   | yes                 |
++---------------------+---------------------+
+| External flashing   | yes                 |
++---------------------+---------------------+
+```
+
+The flash chip (U19) is above the left DIMM slot.
diff --git a/src/mainboard/system76/adl-p/Kconfig b/src/mainboard/system76/adl-p/Kconfig
new file mode 100644
index 000000000000..e9ac90156207
--- /dev/null
+++ b/src/mainboard/system76/adl-p/Kconfig
@@ -0,0 +1,66 @@
+if BOARD_SYSTEM76_DARP8
+
+config BOARD_SPECIFIC_OPTIONS
+	def_bool y
+	select BOARD_ROMSIZE_KB_32768
+	select DRIVERS_I2C_HID
+	select DRIVERS_INTEL_PMC
+	select DRIVERS_INTEL_USB4_RETIMER
+	select EC_SYSTEM76_EC
+	select EC_SYSTEM76_EC_COLOR_KEYBOARD if BOARD_SYSTEM76_DARP8
+	select HAVE_ACPI_TABLES
+	select HAVE_CMOS_DEFAULT
+	select HAVE_OPTION_TABLE
+	select INTEL_GMA_HAVE_VBT
+	select INTEL_LPSS_UART_FOR_CONSOLE
+	select MAINBOARD_HAS_TPM2
+	select MEMORY_MAPPED_TPM
+	select NO_UART_ON_SUPERIO
+	select SOC_INTEL_ALDERLAKE_PCH_P
+	select SOC_INTEL_COMMON_BLOCK_HDA_VERB
+	select SOC_INTEL_CRASHLOG
+	select SOC_INTEL_ENABLE_USB4_PCIE_RESOURCES
+	select SPD_READ_BY_WORD
+	select SYSTEM_TYPE_LAPTOP
+
+config MAINBOARD_DIR
+	default "system76/adl-p"
+
+config VARIANT_DIR
+	default "darp8" if BOARD_SYSTEM76_DARP8
+
+config OVERRIDE_DEVICETREE
+	default "variants/\$(CONFIG_VARIANT_DIR)/overridetree.cb"
+
+config MAINBOARD_PART_NUMBER
+	default "darp8" if BOARD_SYSTEM76_DARP8
+
+config MAINBOARD_SMBIOS_PRODUCT_NAME
+	default "Darter Pro" if BOARD_SYSTEM76_DARP8
+
+config MAINBOARD_VERSION
+	default "darp8" if BOARD_SYSTEM76_DARP8
+
+config CBFS_SIZE
+	default 0xA00000
+
+config CONSOLE_POST
+	default y
+
+config DIMM_SPD_SIZE
+	default 512
+
+config POST_DEVICE
+	default n
+
+config TPM_MEASURED_BOOT
+	default y
+
+config UART_FOR_CONSOLE
+	default 0
+
+# PM Timer Disabled, saves power
+config USE_PM_ACPI_TIMER
+	default n
+
+endif
diff --git a/src/mainboard/system76/adl-p/Kconfig.name b/src/mainboard/system76/adl-p/Kconfig.name
new file mode 100644
index 000000000000..95334511236e
--- /dev/null
+++ b/src/mainboard/system76/adl-p/Kconfig.name
@@ -0,0 +1,2 @@
+config BOARD_SYSTEM76_DARP8
+	bool "darp8"
diff --git a/src/mainboard/system76/adl-p/Makefile.inc b/src/mainboard/system76/adl-p/Makefile.inc
new file mode 100644
index 000000000000..8989d5ce6e1e
--- /dev/null
+++ b/src/mainboard/system76/adl-p/Makefile.inc
@@ -0,0 +1,10 @@
+CPPFLAGS_common += -I$(src)/mainboard/$(MAINBOARDDIR)/include
+
+bootblock-y += bootblock.c
+bootblock-y += variants/$(VARIANT_DIR)/gpio_early.c
+
+romstage-y += variants/$(VARIANT_DIR)/romstage.c
+
+ramstage-y += ramstage.c
+ramstage-y += variants/$(VARIANT_DIR)/hda_verb.c
+ramstage-y += variants/$(VARIANT_DIR)/gpio.c
diff --git a/src/mainboard/system76/adl-p/acpi/backlight.asl b/src/mainboard/system76/adl-p/acpi/backlight.asl
new file mode 100644
index 000000000000..f0202344508b
--- /dev/null
+++ b/src/mainboard/system76/adl-p/acpi/backlight.asl
@@ -0,0 +1,31 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#include <drivers/intel/gma/acpi/gma.asl>
+
+Scope (GFX0)
+{
+	Name (BRIG, Package (22) {
+		40, /* default AC */
+		40, /* default Battery */
+		5,
+		10,
+		15,
+		20,
+		25,
+		30,
+		35,
+		40,
+		45,
+		50,
+		55,
+		60,
+		65,
+		70,
+		75,
+		80,
+		85,
+		90,
+		95,
+		100
+	})
+}
diff --git a/src/mainboard/system76/adl-p/acpi/mainboard.asl b/src/mainboard/system76/adl-p/acpi/mainboard.asl
new file mode 100644
index 000000000000..c982a9ee4cbf
--- /dev/null
+++ b/src/mainboard/system76/adl-p/acpi/mainboard.asl
@@ -0,0 +1,12 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#define EC_GPE_SCI 0x6E
+#define EC_GPE_SWI 0x6B
+#include <ec/system76/ec/acpi/ec.asl>
+
+Scope (\_SB) {
+	#include "sleep.asl"
+	Scope (PCI0) {
+		#include "backlight.asl"
+	}
+}
diff --git a/src/mainboard/system76/adl-p/acpi/sleep.asl b/src/mainboard/system76/adl-p/acpi/sleep.asl
new file mode 100644
index 000000000000..83888f3e59e9
--- /dev/null
+++ b/src/mainboard/system76/adl-p/acpi/sleep.asl
@@ -0,0 +1,46 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#include <intelblocks/gpio.h>
+
+Method (PGPM, 1, Serialized)
+{
+	For (Local0 = 0, Local0 < 6, Local0++)
+	{
+		\_SB.PCI0.CGPM (Local0, Arg0)
+	}
+}
+
+/*
+ * Method called from _PTS prior to system sleep state entry
+ * Enables dynamic clock gating for all 5 GPIO communities
+ */
+Method (MPTS, 1, Serialized)
+{
+	\_SB.PCI0.LPCB.EC0.PTS (Arg0)
+	PGPM (MISCCFG_GPIO_PM_CONFIG_BITS)
+}
+
+/*
+ * Method called from _WAK prior to system sleep state wakeup
+ * Disables dynamic clock gating for all 5 GPIO communities
+ */
+Method (MWAK, 1, Serialized)
+{
+	PGPM (0)
+	\_SB.PCI0.LPCB.EC0.WAK (Arg0)
+}
+
+/*
+ * S0ix Entry/Exit Notifications
+ * Called from \_SB.PEPD._DSM
+ */
+Method (MS0X, 1, Serialized)
+{
+	If (Arg0 == 1) {
+		/* S0ix Entry */
+		PGPM (MISCCFG_GPIO_PM_CONFIG_BITS)
+	} Else {
+		/* S0ix Exit */
+		PGPM (0)
+	}
+}
diff --git a/src/mainboard/system76/adl-p/board_info.txt b/src/mainboard/system76/adl-p/board_info.txt
new file mode 100644
index 000000000000..e67d88006203
--- /dev/null
+++ b/src/mainboard/system76/adl-p/board_info.txt
@@ -0,0 +1,6 @@
+Vendor name: System76
+Category: laptop
+ROM package: WSON-8
+ROM protocol: SPI
+ROM socketed: n
+Flashrom support: y
diff --git a/src/mainboard/system76/adl-p/bootblock.c b/src/mainboard/system76/adl-p/bootblock.c
new file mode 100644
index 000000000000..8d06adc9d7f7
--- /dev/null
+++ b/src/mainboard/system76/adl-p/bootblock.c
@@ -0,0 +1,9 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#include <bootblock_common.h>
+#include <mainboard/gpio.h>
+
+void bootblock_mainboard_early_init(void)
+{
+	mainboard_configure_early_gpios();
+}
diff --git a/src/mainboard/system76/adl-p/cmos.default b/src/mainboard/system76/adl-p/cmos.default
new file mode 100644
index 000000000000..62715bc6bab6
--- /dev/null
+++ b/src/mainboard/system76/adl-p/cmos.default
@@ -0,0 +1,3 @@
+boot_option=Fallback
+debug_level=Debug
+me_state=Enable
diff --git a/src/mainboard/system76/adl-p/cmos.layout b/src/mainboard/system76/adl-p/cmos.layout
new file mode 100644
index 000000000000..a53c3f4bbabd
--- /dev/null
+++ b/src/mainboard/system76/adl-p/cmos.layout
@@ -0,0 +1,39 @@
+# SPDX-License-Identifier: GPL-2.0-only
+
+entries
+
+0	384	r	0	reserved_memory
+
+# RTC_BOOT_BYTE (coreboot hardcoded)
+384	1	e	4	boot_option
+388	4	h	0	reboot_counter
+
+# RTC_CLK_ALTCENTURY
+400	8	r	0	century
+
+412	4	e	6	debug_level
+416	1	e	2	me_state
+417	3	h	0	me_state_counter
+984	16	h	0	check_sum
+
+enumerations
+
+2	0	Enable
+2	1	Disable
+
+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
+
+checksums
+
+checksum 408 983 984
diff --git a/src/mainboard/system76/adl-p/devicetree.cb b/src/mainboard/system76/adl-p/devicetree.cb
new file mode 100644
index 000000000000..6a9f362ac9ac
--- /dev/null
+++ b/src/mainboard/system76/adl-p/devicetree.cb
@@ -0,0 +1,95 @@
+chip soc/intel/alderlake
+	register "common_soc_config" = "{
+		// Touchpad I2C bus
+		.i2c[0] = {
+			.speed = I2C_SPEED_FAST,
+			.rise_time_ns = 80,
+			.fall_time_ns = 110,
+		},
+	}"
+
+	# Enable Enhanced Intel SpeedStep
+	register "eist_enable" = "1"
+
+	register "s0ix_enable" = "1"
+
+	# Enable C6 DRAM
+	register "enable_c6dram" = "1"
+
+	# Thermal
+	register "tcc_offset" = "8"
+
+	device cpu_cluster 0 on
+		device lapic 0 on end
+	end
+
+	device domain 0 on
+		device ref system_agent on end
+		device ref igpu on
+			# DDIA is eDP, DDIB is HDMI
+			register "ddi_portA_config" = "1"
+			register "ddi_ports_config" = "{
+				[DDI_PORT_A] = DDI_ENABLE_HPD,
+				[DDI_PORT_B] = DDI_ENABLE_HPD | DDI_ENABLE_DDC,
+			}"
+
+			register "gfx" = "GMA_DEFAULT_PANEL(0)"
+		end
+		device ref tbt_pcie_rp0 on end
+		device ref shared_sram on end
+		device ref cnvi_wifi on
+			register "cnvi_bt_core" = "true"
+			register "cnvi_bt_audio_offload" = "true"
+			chip drivers/wifi/generic
+				register "wake" = "GPE0_PME_B0"
+				device generic 0 on end
+			end
+		end
+		device ref i2c0 on
+			# Touchpad I2C bus
+			register "serial_io_i2c_mode[PchSerialIoIndexI2C0]" = "PchSerialIoPci"
+			chip drivers/i2c/hid
+				register "generic.hid" = ""ELAN0412""
+				register "generic.desc" = ""ELAN Touchpad""
+				register "generic.irq_gpio" = "ACPI_GPIO_IRQ_LEVEL_LOW(GPP_E12)"
+				register "generic.detect" = "1"
+				register "hid_desc_reg_offset" = "0x01"
+				device i2c 15 on end
+			end
+			chip drivers/i2c/hid
+				register "generic.hid" = ""FTCS1000""
+				register "generic.desc" = ""FocalTech Touchpad""
+				register "generic.irq_gpio" = "ACPI_GPIO_IRQ_LEVEL_LOW(GPP_E12)"
+				register "generic.detect" = "1"
+				register "hid_desc_reg_offset" = "0x01"
+				device i2c 38 on end
+			end
+		end
+		device ref i2c1 on
+			register "serial_io_i2c_mode[PchSerialIoIndexI2C1]" = "PchSerialIoPci"
+		end
+
+		device ref heci1 on end
+		device ref sata on
+			register "sata_salp_support" = "1"
+			register "sata_ports_enable[1]" = "1" # SSD1
+			register "sata_ports_dev_slp[1]" = "1" # GPP_H12 (SATA1_DEVSLP1)
+		end
+		device ref pch_espi on
+			register "gen1_dec" = "0x00040069" # EC PM channel
+			register "gen2_dec" = "0x00fc0e01" # AP/EC command
+			register "gen3_dec" = "0x00fc0f01" # AP/EC debug
+			chip drivers/pc80/tpm
+				device pnp 0c31.0 on end
+			end
+		end
+		device ref p2sb on end
+		device ref hda on
+			register "pch_hda_idisp_codec_enable" = "1"
+			register "pch_hda_idisp_link_frequency" = "HDA_LINKFREQ_96MHZ"
+			register "pch_hda_idisp_link_tmode" = "HDA_TMODE_8T"
+		end
+		device ref smbus on end
+		device ref fast_spi on end
+	end
+end
diff --git a/src/mainboard/system76/adl-p/dsdt.asl b/src/mainboard/system76/adl-p/dsdt.asl
new file mode 100644
index 000000000000..cbf9e6a7e995
--- /dev/null
+++ b/src/mainboard/system76/adl-p/dsdt.asl
@@ -0,0 +1,33 @@
+/* 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/platform.asl>
+	#include <soc/intel/common/block/acpi/acpi/globalnvs.asl>
+	#include <cpu/intel/common/acpi/cpu.asl>
+
+	Device (\_SB.PCI0)
+	{
+		#include <soc/intel/common/block/acpi/acpi/northbridge.asl>
+		#include <soc/intel/alderlake/acpi/southbridge.asl>
+		#include <soc/intel/alderlake/acpi/tcss.asl>
+	}
+
+	#include <southbridge/intel/common/acpi/sleepstates.asl>
+
+	Scope (\_SB.PCI0.LPCB)
+	{
+		#include <drivers/pc80/pc/ps2_controller.asl>
+	}
+
+	#include "acpi/mainboard.asl"
+}
diff --git a/src/mainboard/system76/adl-p/include/mainboard/gpio.h b/src/mainboard/system76/adl-p/include/mainboard/gpio.h
new file mode 100644
index 000000000000..c6393beebb6d
--- /dev/null
+++ b/src/mainboard/system76/adl-p/include/mainboard/gpio.h
@@ -0,0 +1,9 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#ifndef MAINBOARD_GPIO_H
+#define MAINBOARD_GPIO_H
+
+void mainboard_configure_early_gpios(void);
+void mainboard_configure_gpios(void);
+
+#endif
diff --git a/src/mainboard/system76/adl-p/ramstage.c b/src/mainboard/system76/adl-p/ramstage.c
new file mode 100644
index 000000000000..86ce82119e1f
--- /dev/null
+++ b/src/mainboard/system76/adl-p/ramstage.c
@@ -0,0 +1,35 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#include <mainboard/gpio.h>
+#include <soc/ramstage.h>
+#include <smbios.h>
+
+smbios_wakeup_type smbios_system_wakeup_type(void)
+{
+	return SMBIOS_WAKEUP_TYPE_POWER_SWITCH;
+}
+
+void mainboard_silicon_init_params(FSP_S_CONFIG *params)
+{
+	params->CnviRfResetPinMux = 0x194CE404; // GPP_F4
+	params->CnviClkreqPinMux = 0x394CE605; // GPP_F5
+
+	params->PchSerialIoI2cSdaPinMux[0] = 0x1947c404; // GPP_H4
+	params->PchSerialIoI2cSclPinMux[0] = 0x1947a405; // GPP_H5
+	params->PchSerialIoI2cSdaPinMux[1] = 0x1947c606; // GPP_H6
+	params->PchSerialIoI2cSclPinMux[1] = 0x1947a607; // GPP_H7
+
+	params->SataPortDevSlpPinMux[0] = 0x59673e0c; // GPP_H12
+	params->SataPortDevSlpPinMux[1] = 0x5967400d; // GPP_H13
+
+	params->SataPortsSolidStateDrive[1] = 1;
+}
+
+static void mainboard_init(void *chip_info)
+{
+	mainboard_configure_gpios();
+}
+
+struct chip_operations mainboard_ops = {
+	.init = mainboard_init,
+};
diff --git a/src/mainboard/system76/adl-p/variants/darp8/board_info.txt b/src/mainboard/system76/adl-p/variants/darp8/board_info.txt
new file mode 100644
index 000000000000..ea6f525c8195
--- /dev/null
+++ b/src/mainboard/system76/adl-p/variants/darp8/board_info.txt
@@ -0,0 +1,2 @@
+Board name: darp8
+Release year: 2022
diff --git a/src/mainboard/system76/adl-p/variants/darp8/data.vbt b/src/mainboard/system76/adl-p/variants/darp8/data.vbt
new file mode 100644
index 000000000000..0bae6898daa4
--- /dev/null
+++ b/src/mainboard/system76/adl-p/variants/darp8/data.vbt
diff --git a/src/mainboard/system76/adl-p/variants/darp8/gpio.c b/src/mainboard/system76/adl-p/variants/darp8/gpio.c
new file mode 100644
index 000000000000..ce1d722a0846
--- /dev/null
+++ b/src/mainboard/system76/adl-p/variants/darp8/gpio.c
@@ -0,0 +1,227 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#include <mainboard/gpio.h>
+#include <soc/gpio.h>
+
+static const struct pad_config gpio_table[] = {
+	/* ------- GPIO Group GPD ------- */
+	PAD_CFG_NF(GPD0, UP_20K, PWROK, NF1), // PM_BATLOW#
+	PAD_CFG_NF(GPD1, NATIVE, PWROK, NF1), // AC_PRESENT
+	PAD_CFG_NF(GPD2, NATIVE, PWROK, NF1), // LAN_WAKE#
+	PAD_CFG_NF(GPD3, UP_20K, PWROK, NF1), // PWR_BTN#
+	PAD_CFG_NF(GPD4, NONE, PWROK, NF1), // SUSB#_PCH
+	PAD_CFG_NF(GPD5, NONE, PWROK, NF1), // SUSC#_PCH
+	PAD_CFG_NF(GPD6, NONE, PWROK, NF1), // SLP_A#
+	PAD_CFG_GPI(GPD7, NONE, PWROK), // GPD7_REST
+	PAD_CFG_NF(GPD8, NONE, PWROK, NF1), // SUS_CLK
+	PAD_CFG_GPO(GPD9, 0, PWROK), // SLP_WLAN#
+	PAD_CFG_NF(GPD10, NONE, PWROK, NF1), // SLP_S5#
+	PAD_CFG_NF(GPD11, NONE, PWROK, NF1), // LAN_DISABLE#
+
+	/* ------- GPIO Group GPP_A ------- */
+	PAD_CFG_NF(GPP_A0, UP_20K, DEEP, NF1), // ESPI_IO0_EC
+	PAD_CFG_NF(GPP_A1, UP_20K, DEEP, NF1), // ESPI_IO1_EC
+	PAD_CFG_NF(GPP_A2, UP_20K, DEEP, NF1), // ESPI_IO2_EC
+	PAD_CFG_NF(GPP_A3, UP_20K, DEEP, NF1), // ESPI_IO3_EC
+	PAD_CFG_NF(GPP_A4, UP_20K, DEEP, NF1), // ESPI_CS_EC#
+	PAD_CFG_NF(GPP_A5, UP_20K, DEEP, NF1), // ESPI_ALRT0#
+	PAD_NC(GPP_A6, NONE),
+	PAD_CFG_GPI(GPP_A7, NONE, DEEP), // SATAGP0_PCIE_SSD2
+	PAD_CFG_GPO(GPP_A8, 1, PLTRST), // GPIO_LANRTD3
+	PAD_CFG_NF(GPP_A9, DN_20K, DEEP, NF1), // ESPI_CLK_EC
+	PAD_CFG_NF(GPP_A10, NONE, DEEP, NF1), // ESPI_RESET_N
+	PAD_NC(GPP_A11, NONE),
+	PAD_CFG_NF(GPP_A12, NONE, DEEP, NF1), // SATAGP1_SATA_SSD1
+	PAD_CFG_GPO(GPP_A13, 1, PLTRST), // BT_EN
+	PAD_NC(GPP_A14, NONE),
+	PAD_NC(GPP_A15, NONE),
+	PAD_CFG_NF(GPP_A16, NONE, DEEP, NF1), // USB_OC3#
+	PAD_CFG_GPI(GPP_A17, NONE, DEEP), // LID_SW#
+	PAD_CFG_NF(GPP_A18, NONE, DEEP, NF1), // HDMI_HPD
+	PAD_NC(GPP_A19, NONE),
+	PAD_NC(GPP_A20, NONE),
+	PAD_NC(GPP_A21, NONE),
+	PAD_CFG_GPI(GPP_A22, NONE, DEEP), // SSD2_PCIE_WAKE#
+	PAD_NC(GPP_A23, NONE),
+
+	/* ------- GPIO Group GPP_B ------- */
+	PAD_CFG_NF(GPP_B0, NONE, DEEP, NF1), // VCCIN_AUX_VID0
+	PAD_CFG_NF(GPP_B1, NONE, DEEP, NF1), // VCCIN_AUX_VID1
+	PAD_NC(GPP_B2, NONE),
+	PAD_CFG_GPI(GPP_B3, NONE, DEEP), // SCI#
+	PAD_CFG_GPI(GPP_B4, NONE, DEEP), // SWI#
+	PAD_NC(GPP_B5, NONE),
+	PAD_NC(GPP_B6, NONE),
+	PAD_NC(GPP_B7, NONE),
+	PAD_NC(GPP_B8, NONE),
+	// GPP_B9 missing
+	// GPP_B10 missing
+	PAD_CFG_NF(GPP_B11, NONE, PWROK, NF1), // TBTA-PCH_I2C_INT
+	PAD_CFG_NF(GPP_B12, NONE, DEEP, NF1), // SLP_S0#
+	PAD_CFG_NF(GPP_B13, NONE, DEEP, NF1), // PLT_RST#
+	PAD_CFG_NF(GPP_B14, NONE, DEEP, NF1), // Top swap override
+	PAD_NC(GPP_B15, NONE),
+	PAD_CFG_GPO(GPP_B16, 1, PLTRST), // M2_SSD1_RST#
+	PAD_CFG_GPO(GPP_B17, 1, PLTRST), // WLAN_RST#_R
+	PAD_NC(GPP_B18, NONE), // NO REBOOT strap
+	// GPP_B19 missing
+	// GPP_B20 missing
+	// GPP_B21 missing
+	// GPP_B22 missing
+	PAD_CFG_GPI(GPP_B23, NONE, DEEP), // CPUNSSC CLOCK FREQ strap
+
+	/* ------- GPIO Group GPP_C ------- */
+	PAD_CFG_NF(GPP_C0, NONE, DEEP, NF1), // SMB_CLK_TP
+	PAD_CFG_NF(GPP_C1, NONE, DEEP, NF1), // SMB_DATA_TP
+	PAD_CFG_GPO(GPP_C2, 1, PLTRST), // TLS CONFIDENTIALITY strap
+	PAD_CFG_NF(GPP_C3, NONE, DEEP, NF1), // SML0_CLK_R
+	PAD_CFG_NF(GPP_C4, NONE, DEEP, NF1), // SML0_DATA_R
+	PAD_CFG_GPI(GPP_C5, NONE, DEEP), // ESPI OR EC LESS strap
+	PAD_CFG_NF(GPP_C6, NONE, DEEP, NF1), // TBT-PCH_I2C_SCL
+	PAD_CFG_NF(GPP_C7, NONE, DEEP, NF1), // TBT-PCH_I2C_SDA
+	// GPP_C8 missing
+	// GPP_C9 missing
+	// GPP_C10 missing
+	// GPP_C11 missing
+	// GPP_C12 missing
+	// GPP_C13 missing
+	// GPP_C14 missing
+	// GPP_C15 missing
+	// GPP_C16 missing
+	// GPP_C17 missing
+	// GPP_C18 missing
+	// GPP_C19 missing
+	// GPP_C20 missing
+	// GPP_C21 missing
+	// GPP_C22 missing
+	// GPP_C23 missing
+
+	/* ------- GPIO Group GPP_D ------- */
+	PAD_CFG_GPO(GPP_D0, 1, DEEP), // SB_BLON
+	PAD_CFG_GPI(GPP_D1, NONE, DEEP), // SB_KBCRST#
+	PAD_CFG_GPO(GPP_D2, 0, DEEP), // ROM_I2C_EN
+	PAD_NC(GPP_D3, NONE),
+	PAD_CFG_GPO(GPP_D4, 1, DEEP), // GPIO_LAN_EN
+	// GPP_D5 (SSD2_CLKREQ#) configured by FSP
+	PAD_CFG_GPO(GPP_D6, 1, DEEP), // LAN_PLT_RST#
+	// GPP_D7 (WLAN_CLKREQ#) configured by FSP
+	PAD_NC(GPP_D8, NONE),
+	PAD_NC(GPP_D9, NONE),
+	PAD_NC(GPP_D10, NONE), // TBT LSX #2 PINS VCCIO CONFIGURATION strap
+	PAD_CFG_GPI(GPP_D11, NATIVE, DEEP), // Board ID
+	PAD_NC(GPP_D12, NONE), // TBT LSX #3 PINS VCCIO CONFIGURATION strap
+	PAD_CFG_GPI(GPP_D13, NONE, DEEP), // WLAN_WAKEUP#
+	PAD_CFG_GPO(GPP_D14, 1, PLTRST), // SSD2_PWR_EN
+	PAD_CFG_GPO(GPP_D15, 1, DEEP), // GPP_D2_SDCARD_RST#
+	PAD_CFG_GPO(GPP_D16, 1, DEEP), // SSD1_PWR_EN
+	PAD_NC(GPP_D17, NONE),
+	PAD_NC(GPP_D18, NONE),
+	PAD_CFG_GPI(GPP_D19, NONE, DEEP), // SATA_LED#
+
+	/* ------- GPIO Group GPP_E ------- */
+	PAD_CFG_GPI(GPP_E0, NONE, DEEP), // CNVI_WAKE#
+	_PAD_CFG_STRUCT(GPP_E1, 0x40100100, 0x3000), // TPM_PIRQ#
+	PAD_NC(GPP_E2, NONE),
+	PAD_CFG_GPO(GPP_E3, 1, PLTRST), // WLAN_EN
+	PAD_CFG_GPO(GPP_E4, 0, PLTRST), // TBT_FORCE_PWR
+	PAD_NC(GPP_E5, NONE),
+	PAD_CFG_GPI(GPP_E6, NONE, DEEP), // JTAG ODT DISABLE strap
+	PAD_CFG_GPI(GPP_E7, NONE, DEEP), // SMI#
+	PAD_CFG_GPI(GPP_E8, NONE, DEEP), // SLP_DRAM#
+	PAD_CFG_NF(GPP_E9, NONE, DEEP, NF1), // USB_OC0#
+	PAD_CFG_GPI(GPP_E10, NONE, DEEP), // GPP_E10_STRAP
+	PAD_CFG_GPI(GPP_E11, NONE, DEEP), // GPP_E11_STRAP
+	PAD_CFG_GPI_INT(GPP_E12, NONE, PLTRST, LEVEL), // TP_ATTN#
+	PAD_NC(GPP_E13, NONE),
+	PAD_CFG_NF(GPP_E14, NONE, DEEP, NF1), // EDP_HPD
+	PAD_NC(GPP_E15, NONE),
+	PAD_CFG_GPI(GPP_E16, NONE, DEEP), // SDCARD_WAKE#
+	PAD_NC(GPP_E17, NONE),
+	// GPP_E18 (TBT_LSX0_TXD) configured by FSP
+	// GPP_E19 (TBT_LSX0_RXD) configured by FSP
+	PAD_NC(GPP_E20, NONE),
+	PAD_NC(GPP_E21, NONE), // TBT LSX #1 PINS VCCIO CONFIGURATION strap
+	PAD_NC(GPP_E22, NONE),
+	PAD_NC(GPP_E23, NONE),
+
+	/* ------- GPIO Group GPP_F ------- */
+	PAD_CFG_NF(GPP_F0, NONE, DEEP, NF1), // CNVI_BRI_DT
+	PAD_CFG_NF(GPP_F1, UP_20K, DEEP, NF1), // CNVI_BRI_RSP
+	PAD_CFG_NF(GPP_F2, NONE, DEEP, NF1), // CNVI_RGI_DT
+	PAD_CFG_NF(GPP_F3, UP_20K, DEEP, NF1), // CNVI_RGI_RSP
+	PAD_CFG_NF(GPP_F4, NONE, DEEP, NF1), // CNVI_RST#
+	// GPP_F5 (CNVI_CLKREQ) configured by FSP
+	PAD_CFG_NF(GPP_F6, NONE, DEEP, NF1), // CNVI_GNSS_PA_BLANKING
+	PAD_NC(GPP_F7, NONE), // MCRO LDO BYPASS strap
+	// GPP_F8 missing
+	PAD_NC(GPP_F9, NONE),
+	PAD_NC(GPP_F10, NONE), // RSMRSTB SAMPLING strap
+	PAD_NC(GPP_F11, NONE), // BOARD_ID3
+	PAD_NC(GPP_F12, NONE),
+	PAD_NC(GPP_F13, NONE),
+	PAD_CFG_GPI(GPP_F14, NONE, DEEP), // BOARD_ID1
+	PAD_NC(GPP_F15, NONE), // BOARD_ID2
+	PAD_NC(GPP_F16, NONE),
+	PAD_CFG_GPO(GPP_F17, 1, PLTRST), // GPIO_SDCARD_EN
+	PAD_CFG_GPO(GPP_F18, 0, DEEP), // CCD_WP#
+	// GPP_F19 (GLAN_CLKREQ6#) configured by FSP
+	PAD_CFG_GPO(GPP_F20, 1, PLTRST), // M2_SSD2_RST#
+	PAD_NC(GPP_F21, NONE),
+	PAD_NC(GPP_F22, NONE),
+	PAD_NC(GPP_F23, NONE),
+
+	/* ------- GPIO Group GPP_H ------- */
+	PAD_NC(GPP_H0, NONE),
+	PAD_NC(GPP_H1, NONE),
+	PAD_NC(GPP_H2, NONE),
+	PAD_CFG_GPI(GPP_H3, NONE, DEEP), // TPM_DET
+	PAD_CFG_NF(GPP_H4, NONE, DEEP, NF1), // I2C_SDA_TP
+	PAD_CFG_NF(GPP_H5, NONE, DEEP, NF1), // I2C_SCL_TP
+	PAD_CFG_NF(GPP_H6, NONE, DEEP, NF1), // PCH_I2C_SDA
+	PAD_CFG_NF(GPP_H7, NONE, DEEP, NF1), // PCH_I2C_SCL
+	PAD_CFG_NF(GPP_H8, NONE, DEEP, NF2), // CNVI_MFUART2_RXD
+	PAD_CFG_NF(GPP_H9, NONE, DEEP, NF2), // CNVI_MFUART2_TXD
+	// GPP_H10 (UART0_RX) configured in bootblock
+	// GPP_H11 (UART0_TX) configured in bootblock
+	PAD_CFG_NF(GPP_H12, NONE, DEEP, NF1), // SATA1_DEVSLP1
+	PAD_NC(GPP_H13, NONE),
+	// GPP_H14 missing
+	PAD_CFG_NF(GPP_H15, NONE, DEEP, NF1), // HDMI_CTRLCLK
+	// GPP_H16 missing
+	PAD_CFG_NF(GPP_H17, NONE, DEEP, NF1), // HDMI_CTRLDATA
+	PAD_CFG_NF(GPP_H18, NONE, DEEP, NF1), // CPU_C10_GATE#
+	// GPP_H19 (SSD1_CLKREQ#) configured by FSP
+	PAD_CFG_GPI(GPP_H20, NONE, DEEP), // PM_CLKRUN#
+	PAD_NC(GPP_H21, NONE),
+	PAD_NC(GPP_H22, NONE),
+	// GPP_H23 (CARD_CLKREQ#) configured by FSP
+
+	/* ------- GPIO Group GPP_R ------- */
+	PAD_CFG_NF(GPP_R0, NONE, DEEP, NF1), // HDA_BITCLK
+	PAD_CFG_NF(GPP_R1, NATIVE, DEEP, NF1), // HDA_SYNC
+	PAD_CFG_NF(GPP_R2, NATIVE, DEEP, NF1), // HDA_SDOUT
+	PAD_CFG_NF(GPP_R3, NATIVE, DEEP, NF1), // HDA_SDIN0
+	PAD_CFG_NF(GPP_R4, NONE, DEEP, NF1), // HDA_RST#
+	PAD_NC(GPP_R5, NONE),
+	PAD_NC(GPP_R6, NONE), // DMIC_CLK
+	PAD_NC(GPP_R7, NONE), // DMIC_DAT
+
+	/* ------- GPIO Group GPP_S ------- */
+	PAD_NC(GPP_S0, NONE),
+	PAD_NC(GPP_S1, NONE),
+	PAD_NC(GPP_S2, NONE),
+	PAD_NC(GPP_S3, NONE),
+	PAD_NC(GPP_S4, NONE),
+	PAD_NC(GPP_S5, NONE),
+	PAD_NC(GPP_S6, NONE),
+	PAD_NC(GPP_S7, NONE),
+
+	/* ------- GPIO Group GPP_T ------- */
+	PAD_NC(GPP_T2, NONE),
+	PAD_NC(GPP_T3, NONE),
+};
+
+void mainboard_configure_gpios(void)
+{
+	gpio_configure_pads(gpio_table, ARRAY_SIZE(gpio_table));
+}
diff --git a/src/mainboard/system76/adl-p/variants/darp8/gpio_early.c b/src/mainboard/system76/adl-p/variants/darp8/gpio_early.c
new file mode 100644
index 000000000000..c80c798b040f
--- /dev/null
+++ b/src/mainboard/system76/adl-p/variants/darp8/gpio_early.c
@@ -0,0 +1,14 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#include <mainboard/gpio.h>
+#include <soc/gpio.h>
+
+static const struct pad_config early_gpio_table[] = {
+	PAD_CFG_NF(GPP_H10, NONE, DEEP, NF1), // UART0_RX
+	PAD_CFG_NF(GPP_H11, NONE, DEEP, NF1), // UART0_TX
+};
+
+void mainboard_configure_early_gpios(void)
+{
+	gpio_configure_pads(early_gpio_table, ARRAY_SIZE(early_gpio_table));
+}
diff --git a/src/mainboard/system76/adl-p/variants/darp8/hda_verb.c b/src/mainboard/system76/adl-p/variants/darp8/hda_verb.c
new file mode 100644
index 000000000000..df2f8195dc41
--- /dev/null
+++ b/src/mainboard/system76/adl-p/variants/darp8/hda_verb.c
@@ -0,0 +1,26 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#include <device/azalia_device.h>
+
+const u32 cim_verb_data[] = {
+	/* Realtek, ALC256 */
+	0x10ec0256,
+	0x15587716,
+	12,
+	AZALIA_SUBVENDOR(0, 0x15587716),
+	AZALIA_RESET(1),
+	AZALIA_PIN_CFG(0, 0x12, 0x90a60130),
+	AZALIA_PIN_CFG(0, 0x13, 0x40000000),
+	AZALIA_PIN_CFG(0, 0x14, 0x90170110),
+	AZALIA_PIN_CFG(0, 0x18, 0x411111f0),
+	AZALIA_PIN_CFG(0, 0x19, 0x411111f0),
+	AZALIA_PIN_CFG(0, 0x1a, 0x411111f0),
+	AZALIA_PIN_CFG(0, 0x1b, 0x411111f0),
+	AZALIA_PIN_CFG(0, 0x1d, 0x41700001),
+	AZALIA_PIN_CFG(0, 0x1e, 0x411111f0),
+	AZALIA_PIN_CFG(0, 0x21, 0x02211020),
+};
+
+const u32 pc_beep_verbs[] = {};
+
+AZALIA_ARRAY_SIZES;
diff --git a/src/mainboard/system76/adl-p/variants/darp8/overridetree.cb b/src/mainboard/system76/adl-p/variants/darp8/overridetree.cb
new file mode 100644
index 000000000000..4a554adfcce3
--- /dev/null
+++ b/src/mainboard/system76/adl-p/variants/darp8/overridetree.cb
@@ -0,0 +1,171 @@
+chip soc/intel/alderlake
+	# HACK: Limit PL4 to PL2 to prevent power-off when system is booted on
+	# battery power. This seems to only happen with the i7 units.
+	register "power_limits_config[ADL_P_282_482_28W_CORE]" = "{
+		.tdp_pl1_override = 20,
+		.tdp_pl2_override = 56,
+		.tdp_pl4 = 56, // FIXME: Set to 65
+	}"
+
+	# GPE configuration
+	register "pmc_gpe0_dw0" = "PMC_GPP_A"
+	register "pmc_gpe0_dw1" = "PMC_GPP_R"
+	register "pmc_gpe0_dw2" = "PMC_GPD"
+
+	device domain 0 on
+		subsystemid 0x1558 0x7716 inherit
+
+		device ref pcie4_0 on
+			# PCIe PEG0 x4, Clock 0 (SSD2)
+			register "cpu_pcie_rp[CPU_RP(1)]" = "{
+				.clk_src = 0,
+				.clk_req = 0,
+				.flags = PCIE_RP_LTR,
+			}"
+		end
+		device ref tcss_xhci on
+			register "tcss_ports[0]" = "TCSS_PORT_DEFAULT(OC_SKIP)"
+			chip drivers/usb/acpi
+				device ref tcss_root_hub on
+					chip drivers/usb/acpi
+						register "desc" = ""USB3 TBT Type-C""
+						register "type" = "UPC_TYPE_C_USB2_SS_SWITCH"
+						device ref tcss_usb3_port1 on end
+					end
+				end
+			end
+		end
+		device ref xhci on
+			# USB2
+			register "usb2_ports[0]" = "USB2_PORT_MID(OC_SKIP)" # Type-A Motherboard
+			register "usb2_ports[1]" = "USB2_PORT_MID(OC_SKIP)" # Type-A Multi Board
+			register "usb2_ports[2]" = "USB2_PORT_TYPE_C(OC_SKIP)" # J_TYPEC1 (USB 3.2 Gen 2)
+			register "usb2_ports[4]" = "USB2_PORT_MID(OC_SKIP)" # Fingerprint
+			register "usb2_ports[5]" = "USB2_PORT_TYPE_C(OC_SKIP)" # J_TYPEC2 (Thunderbolt)
+			register "usb2_ports[6]" = "USB2_PORT_MID(OC_SKIP)" # Camera
+			register "usb2_ports[9]" = "USB2_PORT_MID(OC_SKIP)" # Bluetooth
+			# USB3
+			register "usb3_ports[0]" = "USB3_PORT_DEFAULT(OC_SKIP)" # Type-A Motherboard
+			register "usb3_ports[1]" = "USB3_PORT_DEFAULT(OC_SKIP)" # J_TYPEC1 CH1
+			register "usb3_ports[2]" = "USB3_PORT_DEFAULT(OC_SKIP)" # J_TYPEC1 CH2
+			# ACPI
+			chip drivers/usb/acpi
+				device ref xhci_root_hub on
+					chip drivers/usb/acpi
+						register "desc" = ""USB2 UJ_USB1""
+						register "type" = "UPC_TYPE_A"
+						device ref usb2_port1 on end
+					end
+					chip drivers/usb/acpi
+						register "desc" = ""USB2 J_USB3_1""
+						register "type" = "UPC_TYPE_A"
+						device ref usb2_port2 on end
+					end
+					chip drivers/usb/acpi
+						register "desc" = ""USB2 J_TYPEC1""
+						register "type" = "UPC_TYPE_C_USB2_SS_SWITCH"
+						device ref usb2_port3 on end
+					end
+					chip drivers/usb/acpi
+						register "desc" = ""USB2 Fingerprint""
+						register "type" = "UPC_TYPE_INTERNAL"
+						device ref usb2_port5 on end
+					end
+					chip drivers/usb/acpi
+						register "desc" = ""USB2 J_TYPEC2""
+						register "type" = "UPC_TYPE_C_USB2_SS_SWITCH"
+						device ref usb2_port6 on end
+					end
+					chip drivers/usb/acpi
+						register "desc" = ""USB2 Camera""
+						register "type" = "UPC_TYPE_INTERNAL"
+						device ref usb2_port7 on end
+					end
+					chip drivers/usb/acpi
+						register "desc" = ""USB2 Bluetooth""
+						register "type" = "UPC_TYPE_INTERNAL"
+						device ref usb2_port10 on end
+					end
+					chip drivers/usb/acpi
+						register "desc" = ""USB3 J_USB3_1""
+						register "type" = "UPC_TYPE_A"
+						device ref usb3_port1 on end
+					end
+					chip drivers/usb/acpi
+						register "desc" = ""USB3 J_TYPEC1 CH0""
+						register "type" = "UPC_TYPE_A"
+						device ref usb3_port2 on end
+					end
+					chip drivers/usb/acpi
+						register "desc" = ""USB3 J_TYPEC1 CH1""
+						register "type" = "UPC_TYPE_A"
+						device ref usb3_port3 on end
+					end
+				end
+			end
+		end
+		device ref tcss_dma0 on
+			chip drivers/intel/usb4/retimer
+				register "dfp[0].power_gpio" = "ACPI_GPIO_OUTPUT_ACTIVE_HIGH(GPP_E4)"
+				use tcss_usb3_port1 as dfp[0].typec_port
+				device generic 0 on end
+			end
+		end
+		device ref pcie_rp5 on
+			# PCIe RP#5 x1, Clock 2 (WLAN)
+			register "pch_pcie_rp[PCH_RP(5)]" = "{
+				.clk_src = 2,
+				.clk_req = 2,
+				.flags = PCIE_RP_LTR | PCIE_RP_AER,
+			}"
+			chip soc/intel/common/block/pcie/rtd3
+				register "enable_gpio" = "ACPI_GPIO_OUTPUT_ACTIVE_HIGH(GPP_E3)" # WLAN_EN
+				register "reset_gpio" = "ACPI_GPIO_OUTPUT_ACTIVE_LOW(GPP_B17)" # WLAN_RST#_R
+				register "srcclk_pin" = "2" # WLAN_CLKREQ#
+				device generic 0 on end
+			end
+		end
+		device ref pcie_rp6 on
+			# PCIe RP#6 x1, Clock 5 (CARD)
+			register "pch_pcie_rp[PCH_RP(6)]" = "{
+				.clk_src = 5,
+				.clk_req = 5,
+				.flags = PCIE_RP_HOTPLUG | PCIE_RP_LTR | PCIE_RP_AER,
+			}"
+		end
+		device ref pcie_rp8 on
+			# PCIe RP#8 x1, Clock 6 (GLAN)
+			register "pch_pcie_rp[PCH_RP(8)]" = "{
+				.clk_src = 6,
+				.clk_req = 6,
+				.flags = PCIE_RP_LTR | PCIE_RP_AER,
+			}"
+		end
+		device ref pcie_rp9 on
+			# PCIe RP#9 x4, Clock 4 (SSD1)
+			register "pch_pcie_rp[PCH_RP(9)]" = "{
+				.clk_src = 4,
+				.clk_req = 4,
+				.flags = PCIE_RP_LTR,
+			}"
+			chip soc/intel/common/block/pcie/rtd3
+				register "enable_gpio" = "ACPI_GPIO_OUTPUT_ACTIVE_HIGH(GPP_D16)" # SSD1_PWR_EN
+				register "reset_gpio" = "ACPI_GPIO_OUTPUT_ACTIVE_LOW(GPP_B16)" # M2_SSD1_RST#
+				register "srcclk_pin" = "4" # SSD1_CLKREQ#
+				device generic 0 on end
+			end
+		end
+		device ref pmc hidden
+			chip drivers/intel/pmc_mux
+				device generic 0 on
+					chip drivers/intel/pmc_mux/conn
+						# J_TYPEC2
+						use usb2_port6 as usb2_port
+						use tcss_usb3_port1 as usb3_port
+						device generic 0 alias conn0 on end
+					end
+				end
+			end
+		end
+	end
+end
diff --git a/src/mainboard/system76/adl-p/variants/darp8/romstage.c b/src/mainboard/system76/adl-p/variants/darp8/romstage.c
new file mode 100644
index 000000000000..3d6a5fb993a1
--- /dev/null
+++ b/src/mainboard/system76/adl-p/variants/darp8/romstage.c
@@ -0,0 +1,25 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#include <soc/meminit.h>
+#include <soc/romstage.h>
+
+void mainboard_memory_init_params(FSPM_UPD *mupd)
+{
+	const struct mb_cfg board_cfg = {
+		.type = MEM_TYPE_DDR4,
+	};
+	const struct mem_spd spd_info = {
+		.topo = MEM_TOPO_DIMM_MODULE,
+		.smbus = {
+			[0] = { .addr_dimm[0] = 0x50, },
+			[1] = { .addr_dimm[0] = 0x52, },
+		},
+	};
+	const bool half_populated = false;
+
+	mupd->FspmConfig.PchHdaAudioLinkHdaEnable = 1;
+	mupd->FspmConfig.DmiMaxLinkSpeed = 4;
+	mupd->FspmConfig.GpioOverride = 0;
+
+	memcfg_init(mupd, &board_cfg, &spd_info, half_populated);
+}