mb/system76/rpl: Add Serval WS 13 as a variant

The Serval Workstation 13 (serw13) is a Raptor Lake-HX board.

Tested with a custom TianoCore UefiPayloadPkg.

Working:

- PS/2 Keyboard
- I2C HID touchpad
- Both DIMM slots with 5200 MT/s memory
- Both M.2 SSD slots
- All USB ports
- Webcam
- Ethernet
- WiFi/Bluetooth
- Integrated graphics using Intel GOP driver
- Internal microphone
- Internal speakers
- Combined 3.5mm headphone + mic audio output
- 3.5mm microphone input
- S3 suspend/resume
- Booting Pop!_OS Linux 22.04 with kernel 6.2.7

Not working:

- Discrete/Hybrid graphics
- Thunderbolt

Change-Id: Id709a7d06854ba9de673d5e3f25c0a1bbcc53d21
Signed-off-by: Tim Crawford <tcrawford@system76.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/73440
Reviewed-by: Jeremy Soller <jeremy@system76.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

12 files changed, 809 insertions, 0 deletions

diff --git a/Documentation/mainboard/index.md b/Documentation/mainboard/index.md
index 2f835a476e..5b8c8a0577 100644
--- a/Documentation/mainboard/index.md
+++ b/Documentation/mainboard/index.md
@@ -227,6 +227,7 @@ The boards in this section are not real mainboards, but emulators.
 - [Oryx Pro 9](system76/oryp9.md)
 - [Oryx Pro 10](system76/oryp10.md)
 - [Oryx Pro 11](system76/oryp11.md)
+- [Serval Workstation 13](system76/serw13.md)
 
 ## Texas Instruments
 
diff --git a/Documentation/mainboard/system76/serw13.md b/Documentation/mainboard/system76/serw13.md
new file mode 100644
index 0000000000..6b56a39afa
--- /dev/null
+++ b/Documentation/mainboard/system76/serw13.md
@@ -0,0 +1,69 @@
+# System76 Serval Workstation 13 (serw13)
+
+## Specs
+
+- CPU
+  - Intel Core i9-13900HX
+- Chipset
+  - Intel HM770
+- EC
+  - ITE IT5570E running [System76 EC](https://github.com/system76/ec)
+- Graphics
+  - dGPU options:
+    - NVIDIA GeForce RTX 4060
+    - NVIDIA GeForce RTX 4070
+  - eDP options:
+    - 15.6" 1920x1080@165Hz LCD (BOE NV156FHM-NY8)
+    - 17.6" 3840x2160@144Hz LCD (AUO B173ZAN03.0)
+  - 1x HDMI 2.1
+  - 1x Mini DisplayPort 1.4
+  - 1x DisplayPort 1.4 over USB-C
+- Memory
+  - Up to 64GB (2x32GB) dual-channel DDR5 SO-DIMMs @ 5200 Mhz
+- Networking
+  - Realtek RTL8125BG-CG 2.5G Ethernet
+  - M.2 NVMe/CNVi WiFi/Bluetooth (Intel Wi-Fi 6 AX210/211)
+- Power
+  - 280W (20V, 14A) AC adapter (Chicony A18-280P1A)
+  - 80Wh 6-cell Lithium-ion battery ()
+- Sound
+  - Realtek ALC1220 codec
+  - Realtek ALC1318 smart amp
+  - Internal speakers and microphone
+  - Combined 3.5mm headphone & microphone jack
+  - Combined 3.5mm microphone & S/PDIF jack
+  - HDMI, mDP, USB-C DP audio
+- Storage
+  - 2x M.2 PCIe NVMe Gen 4 SSDs
+  - MicroSD card reader (Realtek RTS5227S)
+- USB
+  - 1x USB Type-C with Thunderbolt 4
+  - 1x USB 3.2 Gen 2 Type-C
+  - 2x USB 3.2 Gen 1 Type-A
+- Dimensions
+  - 15": 2.49cm x 35.8cm x 24.0cm, 2.4kg
+  - 17": 2.49cm x 39.6cm x 26.2cm, 2.8kg
+
+## 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                 |
++---------------------+---------------------+
+```
+
+The flash chip (U46) is left of the memory slots.
diff --git a/src/mainboard/system76/rpl/Kconfig b/src/mainboard/system76/rpl/Kconfig
index 2428628ba4..28526ae6bd 100644
--- a/src/mainboard/system76/rpl/Kconfig
+++ b/src/mainboard/system76/rpl/Kconfig
@@ -43,6 +43,12 @@ config BOARD_SYSTEM76_ORYP11
 	select SOC_INTEL_ALDERLAKE_PCH_P
 	select SOC_INTEL_ENABLE_USB4_PCIE_RESOURCES
 
+config BOARD_SYSTEM76_SERW13
+	select BOARD_SYSTEM76_RPL_COMMON
+	select EC_SYSTEM76_EC_DGPU
+	select PCIEXP_HOTPLUG
+	select SOC_INTEL_ALDERLAKE_PCH_S
+
 if BOARD_SYSTEM76_RPL_COMMON
 
 config MAINBOARD_DIR
@@ -52,6 +58,7 @@ config VARIANT_DIR
 	default "addw3" if BOARD_SYSTEM76_ADDW3
 	default "gaze18" if BOARD_SYSTEM76_GAZE18
 	default "oryp11" if BOARD_SYSTEM76_ORYP11
+	default "serw13" if BOARD_SYSTEM76_SERW13
 
 config OVERRIDE_DEVICETREE
 	default "variants/\$(CONFIG_VARIANT_DIR)/overridetree.cb"
@@ -60,16 +67,19 @@ config MAINBOARD_PART_NUMBER
 	default "addw3" if BOARD_SYSTEM76_ADDW3
 	default "gaze18" if BOARD_SYSTEM76_GAZE18
 	default "oryp11" if BOARD_SYSTEM76_ORYP11
+	default "serw13" if BOARD_SYSTEM76_SERW13
 
 config MAINBOARD_SMBIOS_PRODUCT_NAME
 	default "Adder WS" if BOARD_SYSTEM76_ADDW3
 	default "Gazelle" if BOARD_SYSTEM76_GAZE18
 	default "Oryx Pro" if BOARD_SYSTEM76_ORYP11
+	default "Serval WS" if BOARD_SYSTEM76_SERW13
 
 config MAINBOARD_VERSION
 	default "addw3" if BOARD_SYSTEM76_ADDW3
 	default "gaze18" if BOARD_SYSTEM76_GAZE18
 	default "oryp11" if BOARD_SYSTEM76_ORYP11
+	default "serw13" if BOARD_SYSTEM76_SERW13
 
 config CONSOLE_POST
 	default y
diff --git a/src/mainboard/system76/rpl/Kconfig.name b/src/mainboard/system76/rpl/Kconfig.name
index 3525bb588f..2661ae7725 100644
--- a/src/mainboard/system76/rpl/Kconfig.name
+++ b/src/mainboard/system76/rpl/Kconfig.name
@@ -6,3 +6,6 @@ config BOARD_SYSTEM76_GAZE18
 
 config BOARD_SYSTEM76_ORYP11
 	bool "oryp11"
+
+config BOARD_SYSTEM76_SERW13
+	bool "serw13"
diff --git a/src/mainboard/system76/rpl/variants/serw13/board.fmd b/src/mainboard/system76/rpl/variants/serw13/board.fmd
new file mode 100644
index 0000000000..b2615d1e17
--- /dev/null
+++ b/src/mainboard/system76/rpl/variants/serw13/board.fmd
@@ -0,0 +1,12 @@
+FLASH 32M {
+	SI_DESC 4K
+	SI_ME 3944K
+	SI_BIOS@16M 16M {
+		RW_MRC_CACHE 64K
+		SMMSTORE(PRESERVE) 256K
+		WP_RO {
+			FMAP 4K
+			COREBOOT(CBFS)
+		}
+	}
+}
diff --git a/src/mainboard/system76/rpl/variants/serw13/board_info.txt b/src/mainboard/system76/rpl/variants/serw13/board_info.txt
new file mode 100644
index 0000000000..1cd6059d4d
--- /dev/null
+++ b/src/mainboard/system76/rpl/variants/serw13/board_info.txt
@@ -0,0 +1,2 @@
+Board name: serw13
+Release year: 2023
diff --git a/src/mainboard/system76/rpl/variants/serw13/data.vbt b/src/mainboard/system76/rpl/variants/serw13/data.vbt
new file mode 100644
index 0000000000..40fdfb28fe
--- /dev/null
+++ b/src/mainboard/system76/rpl/variants/serw13/data.vbt
diff --git a/src/mainboard/system76/rpl/variants/serw13/gpio.c b/src/mainboard/system76/rpl/variants/serw13/gpio.c
new file mode 100644
index 0000000000..acdf54846b
--- /dev/null
+++ b/src/mainboard/system76/rpl/variants/serw13/gpio.c
@@ -0,0 +1,294 @@
+/* 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), // BATLOW_N
+	PAD_CFG_NF(GPD1, NATIVE, PWROK, NF1), // AC_PRESENT
+	PAD_NC(GPD2, NONE),
+	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_NC(GPD6, NONE),
+	PAD_CFG_GPO(GPD7, 0, DEEP), // GPD_7 (Strap)
+	PAD_CFG_NF(GPD8, NONE, PWROK, NF1), // CNVI_SUSCLK
+	PAD_CFG_GPO(GPD9, 0, PWROK), // SLP_WLAN#
+	PAD_NC(GPD10, NONE),
+	PAD_NC(GPD11, NONE),
+	PAD_NC(GPD12, NONE),
+
+	/* ------- 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, DN_20K, DEEP, NF1), // ESPI_CLK_EC
+	PAD_CFG_NF(GPP_A6, NONE, DEEP, NF1), // ESPI_RESET#
+	PAD_NC(GPP_A7, NONE),
+	PAD_NC(GPP_A8, NONE),
+	PAD_NC(GPP_A9, NONE),
+	PAD_CFG_NF(GPP_A10, UP_20K, DEEP, NF1), // ESPI_ALRT0#
+	PAD_CFG_GPI(GPP_A11, UP_20K, DEEP), // GPIO4_GC6_NVVDD_EN_R
+	PAD_NC(GPP_A12, NONE),
+	PAD_NC(GPP_A13, NONE),
+	PAD_NC(GPP_A14, NONE),
+
+	/* ------- GPIO Group GPP_B ------- */
+	_PAD_CFG_STRUCT(GPP_B0, 0x40100100, 0x3000), // TPM_PIRQ#
+	PAD_NC(GPP_B1, NONE),
+	PAD_CFG_GPI(GPP_B2, NONE, DEEP), // CNVI_WAKE#
+	PAD_CFG_GPO(GPP_B3, 1, PLTRST), // PCH_BT_EN
+	PAD_NC(GPP_B4, NONE),
+	PAD_NC(GPP_B5, NONE),
+	PAD_NC(GPP_B6, NONE),
+	PAD_NC(GPP_B7, NONE),
+	PAD_NC(GPP_B8, NONE),
+	PAD_NC(GPP_B9, NONE),
+	PAD_NC(GPP_B10, NONE),
+	PAD_NC(GPP_B11, NONE),
+	PAD_NC(GPP_B12, NONE),
+	PAD_CFG_NF(GPP_B13, NONE, DEEP, NF1), // PLT_RST#
+	PAD_CFG_NF(GPP_B14, NONE, DEEP, NF1), // HDA_SPKR
+	PAD_NC(GPP_B15, NONE),
+	PAD_NC(GPP_B16, NONE),
+	PAD_NC(GPP_B17, NONE),
+	PAD_CFG_NF(GPP_B18, NONE, RSMRST, NF1), // GPP_B18_PMCALERT#
+	PAD_NC(GPP_B19, NONE),
+	PAD_CFG_GPO(GPP_B20, 0, DEEP), // GPIO_LANRTD3
+	_PAD_CFG_STRUCT(GPP_B21, 0x42880100, 0x0000), // GPP_B21_TBT_WAKE#
+	PAD_CFG_GPO(GPP_B22, 0, DEEP), // LAN_EC_RST#
+	PAD_CFG_GPI(GPP_B23, NONE, DEEP), // Crystal frequency strap
+
+	/* ------- GPIO Group GPP_C ------- */
+	PAD_CFG_NF(GPP_C0, NONE, DEEP, NF1), // SMB_CLK
+	PAD_CFG_NF(GPP_C1, NONE, DEEP, NF1), // SMB_DATA
+	PAD_NC(GPP_C2, NONE), // PCH_PORT80_LED (TLS confidentiality strap)
+	PAD_CFG_NF(GPP_C3, NONE, DEEP, NF3), // GPPB_I2C2_SDA (Pantone)
+	PAD_CFG_NF(GPP_C4, NONE, DEEP, NF3), // GPPB_I2C2_SCL (Pantone)
+	PAD_NC(GPP_C5, NONE), // eSPI disable strap
+	PAD_CFG_GPI(GPP_C6, NONE, DEEP), // I2C3_SDA (PD controller)
+	PAD_CFG_GPI(GPP_C7, NONE, DEEP), // I2C3_SCL (PD controller)
+	PAD_CFG_GPI(GPP_C8, NONE, DEEP), // TPM_DET
+	PAD_NC(GPP_C9, NONE),
+	PAD_NC(GPP_C10, NONE),
+	PAD_NC(GPP_C11, NONE),
+	PAD_NC(GPP_C12, NONE),
+	PAD_NC(GPP_C13, NONE),
+	PAD_NC(GPP_C14, NONE),
+	PAD_NC(GPP_C15, NONE),
+	PAD_CFG_NF(GPP_C16, NONE, DEEP, NF1), // I2C_SDA_TP
+	PAD_CFG_NF(GPP_C17, NONE, DEEP, NF1), // I2C_SCL_TP
+	PAD_CFG_NF(GPP_C18, NONE, DEEP, NF1), // PCH_I2C_SDA
+	PAD_CFG_NF(GPP_C19, NONE, DEEP, NF1), // PCH_I2C_SCL
+	// GPP_C20 (UART2_RX) configured in bootblock
+	// GPP_C21 (UART2_TX) configured in bootblock
+	PAD_NC(GPP_C22, NONE),
+	PAD_NC(GPP_C23, NONE),
+
+	/* ------- GPIO Group GPP_D ------- */
+	PAD_NC(GPP_D0, NONE),
+	PAD_NC(GPP_D1, NONE),
+	PAD_NC(GPP_D2, NONE),
+	PAD_CFG_GPO(GPP_D3, 0, DEEP), // GFX_DETECT_STRAP
+	PAD_NC(GPP_D4, NONE),
+	PAD_CFG_GPO(GPP_D5, 1, DEEP), // M.2_BT_PCMFRM_CRF_RST_N
+	// GPP_D6 (M.2_BT_PCMOUT_CLKREQ0) configured by FSP
+	PAD_NC(GPP_D7, NONE), // M.2_BT_PCMIN
+	PAD_NC(GPP_D8, NONE), // M.2_BT_PCMCLK
+	PAD_NC(GPP_D9, NONE),
+	PAD_NC(GPP_D10, NONE),
+	PAD_NC(GPP_D11, NONE),
+	// GPP_D12 (SSD_CLKREQ#) configured by FSP
+	PAD_NC(GPP_D13, NONE),
+	PAD_NC(GPP_D14, NONE),
+	PAD_NC(GPP_D15, NONE),
+	PAD_NC(GPP_D16, NONE),
+	PAD_NC(GPP_D17, NONE),
+	PAD_NC(GPP_D18, NONE),
+	PAD_NC(GPP_D19, NONE),
+	PAD_NC(GPP_D20, NONE),
+	PAD_NC(GPP_D21, NONE),
+	PAD_NC(GPP_D22, NONE),
+	PAD_NC(GPP_D23, NONE),
+
+	/* ------- GPIO Group GPP_E ------- */
+	PAD_NC(GPP_E0, NONE),
+	PAD_NC(GPP_E1, NONE),
+	PAD_CFG_GPI(GPP_E2, NONE, DEEP), // SWI#
+	PAD_CFG_GPI(GPP_E3, NONE, DEEP), // SMI#
+	PAD_NC(GPP_E4, NONE),
+	PAD_NC(GPP_E5, NONE),
+	PAD_NC(GPP_E6, NONE),
+	PAD_CFG_GPI_INT(GPP_E7, NONE, PLTRST, LEVEL), // TP_ATTN#
+	PAD_CFG_NF(GPP_E8, NONE, DEEP, NF1), // SATA_LED#
+	PAD_CFG_GPI(GPP_E9, NONE, DEEP), // USB_OC0#
+	PAD_CFG_GPI(GPP_E10, NONE, DEEP), // USB_OC1#
+	PAD_CFG_GPI(GPP_E11, NONE, DEEP), // USB_OC2#
+	PAD_CFG_GPI(GPP_E12, NONE, DEEP), // USB_OC3#
+	PAD_NC(GPP_E13, NONE),
+	PAD_NC(GPP_E14, NONE),
+	PAD_CFG_GPO(GPP_E15, 0, DEEP), // ROM_I2C_EN
+	PAD_NC(GPP_E16, NONE),
+	PAD_CFG_GPI(GPP_E17, NONE, DEEP), // SB_KBCRST#
+	PAD_CFG_GPO(GPP_E18, 1, DEEP), // SB_BLON
+	PAD_NC(GPP_E19, NONE),
+	PAD_NC(GPP_E20, NONE),
+	PAD_NC(GPP_E21, NONE),
+
+	/* ------- GPIO Group GPP_F ------- */
+	PAD_CFG_NF(GPP_F0, UP_20K, DEEP, NF1), // M.2_SSD_SATA_DET_N
+	PAD_NC(GPP_F1, NONE),
+	PAD_CFG_GPO(GPP_F2, 1, DEEP), // GPP_F2_TBT_RST#
+	PAD_NC(GPP_F3, NONE),
+	PAD_NC(GPP_F4, NONE),
+	PAD_NC(GPP_F5, NONE), // SSD_SATA_DEVSLP
+	PAD_NC(GPP_F6, NONE),
+	PAD_CFG_GPI(GPP_F7, NONE, DEEP), // INTP_8851
+	PAD_CFG_GPI(GPP_F8, NONE, PLTRST), // GC6_FB_EN_PCH
+	// GPP_F9 (DGPU_PWR_EN) configured in bootblock
+	PAD_CFG_GPI(GPP_F10, NONE, DEEP), // Recovery strap
+	PAD_NC(GPP_F11, NONE),
+	PAD_NC(GPP_F12, NONE),
+	PAD_NC(GPP_F13, NONE),
+	PAD_NC(GPP_F14, NONE),
+	PAD_CFG_GPI(GPP_F15, NONE, DEEP), // K_SKTOCC_N
+	PAD_NC(GPP_F16, NONE),
+	PAD_NC(GPP_F17, NONE),
+	PAD_CFG_GPO(GPP_F18, 0, DEEP), // CCD_WP#
+	PAD_CFG_NF(GPP_F19, NONE, DEEP, NF1), // NV_ENAVDD
+	PAD_CFG_NF(GPP_F20, NONE, DEEP, NF1), // BLON
+	PAD_CFG_NF(GPP_F21, NONE, DEEP, NF1), // EDP_BRIGHTNESS
+	PAD_NC(GPP_F22, NONE),
+	PAD_NC(GPP_F23, NONE),
+
+	/* ------- GPIO Group GPP_G ------- */
+	PAD_NC(GPP_G0, NONE),
+	PAD_NC(GPP_G1, NONE),
+	PAD_NC(GPP_G2, NONE),
+	PAD_CFG_GPI(GPP_G3, NONE, DEEP), // MB det (MB1/MB2)
+	PAD_CFG_GPI(GPP_G4, NONE, DEEP), // MB det (15"/17")
+	PAD_CFG_NF(GPP_G5, NONE, DEEP, NF1), // SLP_DRAM_N
+	PAD_CFG_GPI(GPP_G6, NONE, DEEP), // MB det (G-SYNC)
+	PAD_CFG_GPI(GPP_G7, NONE, DEEP), // MB det (Pantone)
+
+	/* ------- GPIO Group GPP_H ------- */
+	PAD_CFG_GPI(GPP_H0, NONE, DEEP), // VAL_SV_ADVANCE_STRAP
+	PAD_NC(GPP_H1, NONE),
+	PAD_CFG_GPI(GPP_H2, NONE, DEEP), // WLAN_GPIO_WAKE_N
+	// GPP_H3 (NC) configured by FSP
+	// GPP_H4 (SSD_SATA_CLKREQ#) configured by FSP
+	// GPP_H5 (WLAN_CLKREQ#) configured by FSP
+	// GPP_H6 (CARD_CLKREQ#) configured by FSP
+	// GPP_H7 (GLAN_CLKREQ#) configured by FSP
+	// GPP_H8 (PEG_CLKREQ#) configured by FSP
+	// GPP_H9 (TBT_CLKREQ#) configured by FSP
+	PAD_NC(GPP_H10, NONE),
+	PAD_NC(GPP_H11, NONE),
+	PAD_NC(GPP_H12, NONE), // eSPI flash sharing mode strap
+	PAD_NC(GPP_H13, NONE),
+	PAD_NC(GPP_H14, NONE),
+	PAD_NC(GPP_H15, NONE), // JTAG ODT disable strap
+	PAD_NC(GPP_H16, NONE),
+	PAD_NC(GPP_H17, NONE),
+	PAD_NC(GPP_H18, NONE), // 1.8V VCCPSPI strap
+	PAD_NC(GPP_H19, NONE),
+	PAD_NC(GPP_H20, NONE),
+	PAD_NC(GPP_H21, NONE),
+	PAD_NC(GPP_H22, NONE),
+	PAD_NC(GPP_H23, NONE),
+
+	/* ------- GPIO Group GPP_I ------- */
+	_PAD_CFG_STRUCT(GPP_I0, 0x86880100, 0x0000), // DP_F_HPD
+	PAD_CFG_NF(GPP_I1, NONE, DEEP, NF1), // CPU_DP_B_HPD
+	_PAD_CFG_STRUCT(GPP_I2, 0x86880100, 0x0000), // HDMI_HPD
+	PAD_CFG_NF(GPP_I3, NONE, DEEP, NF1), // CPU_DP_D_HPD
+	_PAD_CFG_STRUCT(GPP_I4, 0x86880100, 0x0000), // G_DP_DHPD_E
+	PAD_CFG_GPO(GPP_I5, 0, DEEP), // GPIO_TBT_RESET
+	PAD_NC(GPP_I6, NONE),
+	PAD_NC(GPP_I7, NONE),
+	PAD_NC(GPP_I8, NONE),
+	PAD_NC(GPP_I9, NONE),
+	PAD_NC(GPP_I10, NONE),
+	PAD_CFG_GPI(GPP_I11, NONE, DEEP), // USB_OC4#
+	PAD_CFG_GPI(GPP_I12, NONE, DEEP), // USB_OC5#
+	PAD_CFG_GPI(GPP_I13, NONE, DEEP), // USB_OC6#
+	PAD_CFG_GPI(GPP_I14, NONE, DEEP), // USB_OC7#
+	PAD_NC(GPP_I15, NONE),
+	PAD_NC(GPP_I16, NONE),
+	PAD_NC(GPP_I17, NONE),
+	PAD_NC(GPP_I18, NONE), // NO REBOOT strap
+	PAD_NC(GPP_I19, NONE),
+	PAD_NC(GPP_I20, NONE),
+	PAD_NC(GPP_I21, NONE),
+	PAD_NC(GPP_I22, NONE), // BOOT BIOS strap
+
+	/* ------- GPIO Group GPP_J ------- */
+	PAD_CFG_NF(GPP_J0, NONE, DEEP, NF1), // CNVI_GNSS_PA_BLANKING
+	PAD_CFG_NF(GPP_J1, NONE, DEEP, NF1), // CPU_C10_GATE_N
+	PAD_CFG_NF(GPP_J2, NONE, DEEP, NF1), // CNVI_BRI_DT_R
+	PAD_CFG_NF(GPP_J3, UP_20K, DEEP, NF1), // CNVI_BRI_RSP
+	PAD_CFG_NF(GPP_J4, NONE, DEEP, NF1), // CNVI_RGI_DT_R
+	PAD_CFG_NF(GPP_J5, UP_20K, DEEP, NF1), // CNVI_RGI_RSP
+	PAD_CFG_NF(GPP_J6, NONE, DEEP, NF1), // CNVI_MFUART2_RXD
+	PAD_CFG_NF(GPP_J7, NONE, DEEP, NF1), // CNVI_MFUART2_TXD
+	PAD_CFG_GPI(GPP_J8, NONE, DEEP), // VAL_TEST_SETUP_MENU
+	PAD_NC(GPP_J9, NONE),
+	PAD_NC(GPP_J10, NONE),
+	PAD_NC(GPP_J11, NONE),
+
+	/* ------- GPIO Group GPP_K ------- */
+	_PAD_CFG_STRUCT(GPP_K0, 0x42800100, 0x0000), // TBCIO_PLUG_EVENT#
+	PAD_NC(GPP_K1, NONE),
+	PAD_NC(GPP_K2, NONE),
+	PAD_CFG_GPO(GPP_K3, 1, PLTRST), // TBT_RTD3_PWR_EN_R
+	PAD_CFG_GPO(GPP_K4, 0, RSMRST), // TBT_FORCE_PWR_R
+	PAD_NC(GPP_K5, NONE),
+	// GPP_K6 doesn't exist
+	// GPP_K7 doesn't exist
+	PAD_CFG_NF(GPP_K8, NONE, DEEP, NF1), // VCCIN_AUX_VID0
+	PAD_CFG_NF(GPP_K9, NONE, DEEP, NF1), // VCCIN_AUX_VID1
+	// GPP_K10 doesn't exist
+	PAD_NC(GPP_K11, NONE),
+
+	/* ------- 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 / ME_WE
+	PAD_CFG_NF(GPP_R3, NATIVE, DEEP, NF1), // HDA_SDIN0
+	PAD_CFG_NF(GPP_R4, NONE, DEEP, NF1), // HDA_RST#_R
+	PAD_NC(GPP_R5, NONE),
+	PAD_NC(GPP_R6, NONE),
+	PAD_NC(GPP_R7, NONE),
+	PAD_CFG_GPI(GPP_R8, NONE, DEEP), // DGPU_PWRGD_R
+	PAD_CFG_NF(GPP_R9, NONE, DEEP, NF1), // EDP_HPD
+	PAD_NC(GPP_R10, NONE),
+	PAD_NC(GPP_R11, NONE),
+	PAD_NC(GPP_R12, NONE),
+	PAD_NC(GPP_R13, NONE),
+	PAD_NC(GPP_R14, NONE),
+	PAD_NC(GPP_R15, NONE),
+	// GPP_R16 (DGPU_RST#_PCH) configured in bootblock
+	PAD_NC(GPP_R17, NONE),
+	PAD_NC(GPP_R18, NONE),
+	PAD_CFG_GPI(GPP_R19, NONE, DEEP), // SCI#
+	PAD_NC(GPP_R20, NONE),
+	PAD_NC(GPP_R21, NONE),
+
+	/* ------- 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), // GPPS_DMIC_CLK
+	PAD_NC(GPP_S5, NONE), // GPPS_DMIC_DATA
+	PAD_NC(GPP_S6, NONE),
+	PAD_NC(GPP_S7, NONE),
+};
+
+void mainboard_configure_gpios(void)
+{
+	gpio_configure_pads(gpio_table, ARRAY_SIZE(gpio_table));
+}
diff --git a/src/mainboard/system76/rpl/variants/serw13/gpio_early.c b/src/mainboard/system76/rpl/variants/serw13/gpio_early.c
new file mode 100644
index 0000000000..fe6584546b
--- /dev/null
+++ b/src/mainboard/system76/rpl/variants/serw13/gpio_early.c
@@ -0,0 +1,16 @@
+/* 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_GPO(GPP_F9, 0, DEEP), // DGPU_PWR_EN
+	PAD_CFG_GPO(GPP_R16, 0, DEEP), // DGPU_RST#_PCH
+	PAD_CFG_NF(GPP_C20, NONE, DEEP, NF1), // UART2_RX
+	PAD_CFG_NF(GPP_C21, NONE, DEEP, NF1), // UART2_TX
+};
+
+void mainboard_configure_early_gpios(void)
+{
+	gpio_configure_pads(early_gpio_table, ARRAY_SIZE(early_gpio_table));
+}
diff --git a/src/mainboard/system76/rpl/variants/serw13/hda_verb.c b/src/mainboard/system76/rpl/variants/serw13/hda_verb.c
new file mode 100644
index 0000000000..573e2288b1
--- /dev/null
+++ b/src/mainboard/system76/rpl/variants/serw13/hda_verb.c
@@ -0,0 +1,261 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#include <device/azalia_device.h>
+
+const u32 cim_verb_data[] = {
+	/* Realtek, ALC1220 */
+	0x10ec1220, /* Vendor ID */
+	0x1558d502, /* Subsystem ID */
+	241,
+
+	0x02050008, 0x020480cb, 0x02050008, 0x0204c0cb,
+	AZALIA_SUBVENDOR(0, 0x1558d502),
+	AZALIA_RESET(1),
+	AZALIA_PIN_CFG(0, 0x12, 0x90a60130),
+	AZALIA_PIN_CFG(0, 0x14, 0x0421101f),
+	AZALIA_PIN_CFG(0, 0x15, 0x40000000),
+	AZALIA_PIN_CFG(0, 0x16, 0x411111f0),
+	AZALIA_PIN_CFG(0, 0x17, 0x411111f0),
+	AZALIA_PIN_CFG(0, 0x18, 0x04a11040),
+	AZALIA_PIN_CFG(0, 0x19, 0x411111f0),
+	AZALIA_PIN_CFG(0, 0x1a, 0x411111f0),
+	AZALIA_PIN_CFG(0, 0x1b, 0x90170110),
+	AZALIA_PIN_CFG(0, 0x1d, 0x40b7952d),
+	AZALIA_PIN_CFG(0, 0x1e, 0x04451150),
+
+	// ALC1318 smart amp
+	0x02050016, 0x02048020, 0x02050016, 0x02048020,
+	0x02050043, 0x02043005, 0x02050058, 0x02048ed1,
+	0x02050063, 0x0204e430, 0x05b50000, 0x05b43530,
+	0x05750002, 0x05741400, 0x05b5000a, 0x05b45520,
+	0x02050042, 0x020486cb, 0x0143b000, 0x01470700,
+	0x02050036, 0x02042a6a, 0x02050008, 0x0204800b,
+	0x02050007, 0x020403c3, 0x01470c02, 0x01470c02,
+	0x00c37180, 0x01b3b000, 0x01b70700, 0x00b37419,
+	0x0205001b, 0x02044002, 0x0205001b, 0x02044002,
+	0x02050027, 0x02040010, 0x02050028, 0x02040000,
+	0x02050029, 0x0204c000, 0x0205002b, 0x02040001,
+	0x0205002c, 0x0204b423, 0x02050027, 0x02040010,
+	0x02050028, 0x02040000, 0x02050029, 0x0204f20d,
+	0x0205002b, 0x02040000, 0x0205002c, 0x0204b423,
+	0x02050027, 0x02040010, 0x02050028, 0x02040000,
+	0x02050029, 0x0204f212, 0x0205002b, 0x0204003e,
+	0x0205002c, 0x0204b423, 0x02050027, 0x02040010,
+	0x02050028, 0x02040000, 0x02050029, 0x0204c001,
+	0x0205002b, 0x02040002, 0x0205002c, 0x0204b423,
+	0x02050027, 0x02040010, 0x02050028, 0x02040000,
+	0x02050029, 0x0204c003, 0x0205002b, 0x02040022,
+	0x0205002c, 0x0204b423, 0x02050027, 0x02040010,
+	0x02050028, 0x02040000, 0x02050029, 0x0204c004,
+	0x0205002b, 0x02040044, 0x0205002c, 0x0204b423,
+	0x02050027, 0x02040010, 0x02050028, 0x02040000,
+	0x02050029, 0x0204c005, 0x0205002b, 0x02040044,
+	0x0205002c, 0x0204b423, 0x02050027, 0x02040010,
+	0x02050028, 0x02040000, 0x02050029, 0x0204c007,
+	0x0205002b, 0x02040064, 0x0205002c, 0x0204b423,
+	0x02050027, 0x02040010, 0x02050028, 0x02040000,
+	0x02050029, 0x0204c00e, 0x0205002b, 0x020400e7,
+	0x0205002c, 0x0204b423, 0x02050027, 0x02040010,
+	0x02050028, 0x02040000, 0x02050029, 0x0204f223,
+	0x0205002b, 0x0204007f, 0x0205002c, 0x0204b423,
+	0x02050027, 0x02040010, 0x02050028, 0x02040000,
+	0x02050029, 0x0204f224, 0x0205002b, 0x020400db,
+	0x0205002c, 0x0204b423, 0x02050027, 0x02040010,
+	0x02050028, 0x02040000, 0x02050029, 0x0204f225,
+	0x0205002b, 0x020400ee, 0x0205002c, 0x0204b423,
+	0x02050027, 0x02040010, 0x02050028, 0x02040000,
+	0x02050029, 0x0204f226, 0x0205002b, 0x0204003f,
+	0x0205002c, 0x0204b423, 0x02050027, 0x02040010,
+	0x02050028, 0x02040000, 0x02050029, 0x0204f227,
+	0x0205002b, 0x0204000f, 0x0205002c, 0x0204b423,
+	0x02050027, 0x02040010, 0x02050028, 0x02040000,
+	0x02050029, 0x0204f21a, 0x0205002b, 0x02040078,
+	0x0205002c, 0x0204b423, 0x02050027, 0x02040010,
+	0x02050028, 0x02040000, 0x02050029, 0x0204f242,
+	0x0205002b, 0x0204003c, 0x0205002c, 0x0204b423,
+	0x02050027, 0x02040010, 0x02050028, 0x02040000,
+	0x02050029, 0x0204c120, 0x0205002b, 0x02040040,
+	0x0205002c, 0x0204b423, 0x02050027, 0x02040010,
+	0x02050028, 0x02040000, 0x02050029, 0x0204c125,
+	0x0205002b, 0x02040003, 0x0205002c, 0x0204b423,
+	0x02050027, 0x02040010, 0x02050028, 0x02040000,
+	0x02050029, 0x0204c321, 0x0205002b, 0x0204000b,
+	0x0205002c, 0x0204b423, 0x02050027, 0x02040010,
+	0x02050028, 0x02040000, 0x02050029, 0x0204c200,
+	0x0205002b, 0x020400d8, 0x0205002c, 0x0204b423,
+	0x02050027, 0x02040010, 0x02050028, 0x02040000,
+	0x02050029, 0x0204c201, 0x0205002b, 0x02040027,
+	0x0205002c, 0x0204b423, 0x02050027, 0x02040010,
+	0x02050028, 0x02040000, 0x02050029, 0x0204c202,
+	0x0205002b, 0x0204000f, 0x0205002c, 0x0204b423,
+	0x02050027, 0x02040010, 0x02050028, 0x02040000,
+	0x02050029, 0x0204c400, 0x0205002b, 0x0204000e,
+	0x0205002c, 0x0204b423, 0x02050027, 0x02040010,
+	0x02050028, 0x02040000, 0x02050029, 0x0204c401,
+	0x0205002b, 0x02040043, 0x0205002c, 0x0204b423,
+	0x02050027, 0x02040010, 0x02050028, 0x02040000,
+	0x02050029, 0x0204c402, 0x0205002b, 0x020400e0,
+	0x0205002c, 0x0204b423, 0x02050027, 0x02040010,
+	0x02050028, 0x02040000, 0x02050029, 0x0204c403,
+	0x0205002b, 0x02040000, 0x0205002c, 0x0204b423,
+	0x02050027, 0x02040010, 0x02050028, 0x02040000,
+	0x02050029, 0x0204c404, 0x0205002b, 0x0204004c,
+	0x0205002c, 0x0204b423, 0x02050027, 0x02040010,
+	0x02050028, 0x02040000, 0x02050029, 0x0204c406,
+	0x0205002b, 0x02040040, 0x0205002c, 0x0204b423,
+	0x02050027, 0x02040010, 0x02050028, 0x02040000,
+	0x02050029, 0x0204c407, 0x0205002b, 0x02040002,
+	0x0205002c, 0x0204b423, 0x02050027, 0x02040010,
+	0x02050028, 0x02040000, 0x02050029, 0x0204c408,
+	0x0205002b, 0x0204003f, 0x0205002c, 0x0204b423,
+	0x02050027, 0x02040010, 0x02050028, 0x02040000,
+	0x02050029, 0x0204c300, 0x0205002b, 0x02040001,
+	0x0205002c, 0x0204b423, 0x02050027, 0x02040010,
+	0x02050028, 0x02040000, 0x02050029, 0x0204c125,
+	0x0205002b, 0x02040003, 0x0205002c, 0x0204b423,
+	0x02050027, 0x02040010, 0x02050028, 0x02040000,
+	0x02050029, 0x0204df00, 0x0205002b, 0x02040010,
+	0x0205002c, 0x0204b423, 0x02050027, 0x02040010,
+	0x02050028, 0x02040000, 0x02050029, 0x0204df5f,
+	0x0205002b, 0x02040001, 0x0205002c, 0x0204b423,
+	0x02050027, 0x02040010, 0x02050028, 0x02040000,
+	0x02050029, 0x0204df60, 0x0205002b, 0x020400a7,
+	0x0205002c, 0x0204b423, 0x02050027, 0x02040010,
+	0x02050028, 0x02040000, 0x02050029, 0x0204ea00,
+	0x0205002b, 0x02040047, 0x0205002c, 0x0204b423,
+	0x02050027, 0x02040010, 0x02050028, 0x02040000,
+	0x02050029, 0x0204c203, 0x0205002b, 0x02040004,
+	0x0205002c, 0x0204b423, 0x02050027, 0x02040010,
+	0x02050028, 0x02040000, 0x02050029, 0x0204c206,
+	0x0205002b, 0x02040078, 0x0205002c, 0x0204b423,
+	0x02050027, 0x02040010, 0x02050028, 0x02040000,
+	0x02050029, 0x0204f102, 0x0205002b, 0x02040000,
+	0x0205002c, 0x0204b423, 0x02050027, 0x02040010,
+	0x02050028, 0x02040000, 0x02050029, 0x0204f103,
+	0x0205002b, 0x02040000, 0x0205002c, 0x0204b423,
+	0x02050027, 0x02040010, 0x02050028, 0x02040000,
+	0x02050029, 0x0204f104, 0x0205002b, 0x020400f4,
+	0x0205002c, 0x0204b423, 0x02050027, 0x02040010,
+	0x02050028, 0x02040000, 0x02050029, 0x0204f105,
+	0x0205002b, 0x02040003, 0x0205002c, 0x0204b423,
+	0x02050027, 0x02040010, 0x02050028, 0x02040000,
+	0x02050029, 0x0204f109, 0x0205002b, 0x020400e0,
+	0x0205002c, 0x0204b423, 0x02050027, 0x02040010,
+	0x02050028, 0x02040000, 0x02050029, 0x0204f10a,
+	0x0205002b, 0x0204000b, 0x0205002c, 0x0204b423,
+	0x02050027, 0x02040010, 0x02050028, 0x02040000,
+	0x02050029, 0x0204f10b, 0x0205002b, 0x0204004c,
+	0x0205002c, 0x0204b423, 0x02050027, 0x02040010,
+	0x02050028, 0x02040000, 0x02050029, 0x0204f10b,
+	0x0205002b, 0x0204005c, 0x0205002c, 0x0204b423,
+	0x02050027, 0x02040010, 0x02050028, 0x02040000,
+	0x02050029, 0x0204f102, 0x0205002b, 0x02040000,
+	0x0205002c, 0x0204b423, 0x02050027, 0x02040010,
+	0x02050028, 0x02040000, 0x02050029, 0x0204f103,
+	0x0205002b, 0x02040000, 0x0205002c, 0x0204b423,
+	0x02050027, 0x02040010, 0x02050028, 0x02040000,
+	0x02050029, 0x0204f104, 0x0205002b, 0x020400f4,
+	0x0205002c, 0x0204b423, 0x02050027, 0x02040010,
+	0x02050028, 0x02040000, 0x02050029, 0x0204f105,
+	0x0205002b, 0x02040004, 0x0205002c, 0x0204b423,
+	0x02050027, 0x02040010, 0x02050028, 0x02040000,
+	0x02050029, 0x0204f109, 0x0205002b, 0x02040065,
+	0x0205002c, 0x0204b423, 0x02050027, 0x02040010,
+	0x02050028, 0x02040000, 0x02050029, 0x0204f10a,
+	0x0205002b, 0x0204000b, 0x0205002c, 0x0204b423,
+	0x02050027, 0x02040010, 0x02050028, 0x02040000,
+	0x02050029, 0x0204f10b, 0x0205002b, 0x0204004c,
+	0x0205002c, 0x0204b423, 0x02050027, 0x02040010,
+	0x02050028, 0x02040000, 0x02050029, 0x0204f10b,
+	0x0205002b, 0x0204005c, 0x0205002c, 0x0204b423,
+	0x02050027, 0x02040010, 0x02050028, 0x02040000,
+	0x02050029, 0x0204e706, 0x0205002b, 0x0204000f,
+	0x0205002c, 0x0204b423, 0x02050027, 0x02040010,
+	0x02050028, 0x02040000, 0x02050029, 0x0204e707,
+	0x0205002b, 0x02040030, 0x0205002c, 0x0204b423,
+	0x02050027, 0x02040010, 0x02050028, 0x02040000,
+	0x02050029, 0x0204e806, 0x0205002b, 0x0204000f,
+	0x0205002c, 0x0204b423, 0x02050027, 0x02040010,
+	0x02050028, 0x02040000, 0x02050029, 0x0204e807,
+	0x0205002b, 0x02040030, 0x0205002c, 0x0204b423,
+	0x02050027, 0x02040010, 0x02050028, 0x02040000,
+	0x02050029, 0x0204ce04, 0x0205002b, 0x02040002,
+	0x0205002c, 0x0204b423, 0x02050027, 0x02040010,
+	0x02050028, 0x02040000, 0x02050029, 0x0204ce05,
+	0x0205002b, 0x02040087, 0x0205002c, 0x0204b423,
+	0x02050027, 0x02040010, 0x02050028, 0x02040000,
+	0x02050029, 0x0204ce06, 0x0205002b, 0x020400a2,
+	0x0205002c, 0x0204b423, 0x02050027, 0x02040010,
+	0x02050028, 0x02040000, 0x02050029, 0x0204ce07,
+	0x0205002b, 0x0204006c, 0x0205002c, 0x0204b423,
+	0x02050027, 0x02040010, 0x02050028, 0x02040000,
+	0x02050029, 0x0204cf04, 0x0205002b, 0x02040002,
+	0x0205002c, 0x0204b423, 0x02050027, 0x02040010,
+	0x02050028, 0x02040000, 0x02050029, 0x0204cf05,
+	0x0205002b, 0x02040087, 0x0205002c, 0x0204b423,
+	0x02050027, 0x02040010, 0x02050028, 0x02040000,
+	0x02050029, 0x0204cf06, 0x0205002b, 0x020400a2,
+	0x0205002c, 0x0204b423, 0x02050027, 0x02040010,
+	0x02050028, 0x02040000, 0x02050029, 0x0204cf07,
+	0x0205002b, 0x0204006c, 0x0205002c, 0x0204b423,
+	0x02050027, 0x02040010, 0x02050028, 0x02040000,
+	0x02050029, 0x0204ce60, 0x0205002b, 0x020400e3,
+	0x0205002c, 0x0204b423, 0x02050027, 0x02040010,
+	0x02050028, 0x02040000, 0x02050029, 0x0204c130,
+	0x0205002b, 0x02040051, 0x0205002c, 0x0204b423,
+	0x02050027, 0x02040010, 0x02050028, 0x02040000,
+	0x02050029, 0x0204e000, 0x0205002b, 0x020400a8,
+	0x0205002c, 0x0204b423, 0x02050027, 0x02040010,
+	0x02050028, 0x02040000, 0x02050029, 0x0204f102,
+	0x0205002b, 0x02040000, 0x0205002c, 0x0204b423,
+	0x02050027, 0x02040010, 0x02050028, 0x02040000,
+	0x02050029, 0x0204f103, 0x0205002b, 0x02040000,
+	0x0205002c, 0x0204b423, 0x02050027, 0x02040010,
+	0x02050028, 0x02040000, 0x02050029, 0x0204f104,
+	0x0205002b, 0x020400f5, 0x0205002c, 0x0204b423,
+	0x02050027, 0x02040010, 0x02050028, 0x02040000,
+	0x02050029, 0x0204f105, 0x0205002b, 0x02040023,
+	0x0205002c, 0x0204b423, 0x02050027, 0x02040010,
+	0x02050028, 0x02040000, 0x02050029, 0x0204f109,
+	0x0205002b, 0x02040004, 0x0205002c, 0x0204b423,
+	0x02050027, 0x02040010, 0x02050028, 0x02040000,
+	0x02050029, 0x0204f10a, 0x0205002b, 0x0204000b,
+	0x0205002c, 0x0204b423, 0x02050027, 0x02040010,
+	0x02050028, 0x02040000, 0x02050029, 0x0204f10b,
+	0x0205002b, 0x0204004c, 0x0205002c, 0x0204b423,
+	0x02050027, 0x02040010, 0x02050028, 0x02040000,
+	0x02050029, 0x0204f10b, 0x0205002b, 0x0204005c,
+	0x0205002c, 0x0204b423, 0x02050027, 0x02040010,
+	0x02050028, 0x02044100, 0x02050029, 0x02041888,
+	0x0205002b, 0x02040000, 0x0205002c, 0x0204b423,
+	0x02050027, 0x02040010, 0x02050028, 0x02040000,
+	0x02050029, 0x0204c121, 0x0205002b, 0x0204000b,
+	0x0205002c, 0x0204b423, 0x02050027, 0x02040010,
+	0x02050028, 0x02040000, 0x02050029, 0x0204f102,
+	0x0205002b, 0x02040000, 0x0205002c, 0x0204b423,
+	0x02050027, 0x02040010, 0x02050028, 0x02040000,
+	0x02050029, 0x0204f103, 0x0205002b, 0x02040000,
+	0x0205002c, 0x0204b423, 0x02050027, 0x02040010,
+	0x02050028, 0x02040000, 0x02050029, 0x0204f104,
+	0x0205002b, 0x020400f5, 0x0205002c, 0x0204b423,
+	0x02050027, 0x02040010, 0x02050028, 0x02040000,
+	0x02050029, 0x0204f105, 0x0205002b, 0x02040023,
+	0x0205002c, 0x0204b423, 0x02050027, 0x02040010,
+	0x02050028, 0x02040000, 0x02050029, 0x0204f109,
+	0x0205002b, 0x02040000, 0x0205002c, 0x0204b423,
+	0x02050027, 0x02040010, 0x02050028, 0x02040000,
+	0x02050029, 0x0204f10a, 0x0205002b, 0x0204000b,
+	0x0205002c, 0x0204b423, 0x02050027, 0x02040010,
+	0x02050028, 0x02040000, 0x02050029, 0x0204f10b,
+	0x0205002b, 0x0204004c, 0x0205002c, 0x0204b423,
+	0x02050027, 0x02040010, 0x02050028, 0x02040000,
+	0x02050029, 0x0204f10b, 0x0205002b, 0x0204005c,
+	0x0205002c, 0x0204b423,
+
+	// XXX: Duplicate last 2 u32s to keep in 4-dword blocks
+	0x0205002c, 0x0204b423,
+};
+
+const u32 pc_beep_verbs[] = {};
+
+AZALIA_ARRAY_SIZES;
diff --git a/src/mainboard/system76/rpl/variants/serw13/overridetree.cb b/src/mainboard/system76/rpl/variants/serw13/overridetree.cb
new file mode 100644
index 0000000000..0faf98ced1
--- /dev/null
+++ b/src/mainboard/system76/rpl/variants/serw13/overridetree.cb
@@ -0,0 +1,109 @@
+chip soc/intel/alderlake
+	# Support 5200 MT/s memory
+	register "max_dram_speed_mts" = "5200"
+
+	device domain 0 on
+		subsystemid 0x1558 0xd502 inherit
+
+		device ref xhci on
+			# USB2
+			register "usb2_ports[0]" = "USB2_PORT_MID(OC_SKIP)" # TYPEC2 (USB 3.1 Gen2 + DP 1.4 HBR3)
+			register "usb2_ports[1]" = "USB2_PORT_MID(OC_SKIP)" # AJ_USB1 (USB 3.2 Gen2)
+			register "usb2_ports[2]" = "USB2_PORT_MID(OC_SKIP)" # AJ_USB2 (USB 3.2 Gen2 + charger)
+			register "usb2_ports[5]" = "USB2_PORT_MID(OC_SKIP)" # Per-KB
+			register "usb2_ports[6]" = "USB2_PORT_MID(OC_SKIP)" # Fingerprint
+			register "usb2_ports[7]" = "USB2_PORT_MID(OC_SKIP)" # Camera
+			register "usb2_ports[8]" = "USB2_PORT_MID(OC_SKIP)" # TBT USB2.0
+			register "usb2_ports[13]" = "USB2_PORT_MID(OC_SKIP)" # Bluetooth
+			# USB3
+			register "usb3_ports[0]" = "USB3_PORT_DEFAULT(OC_SKIP)" # TYPEC2 (USB 3.1 Gen2 + DP 1.4 HBR3)
+			register "usb3_ports[1]" = "USB3_PORT_DEFAULT(OC_SKIP)" # AJ_USB1 (USB 3.2 Gen2)
+			register "usb3_ports[2]" = "USB3_PORT_DEFAULT(OC_SKIP)" # AJ_USB2 (USB 3.2 Gen2 + charger)
+		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_E7)"
+				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_E7)"
+				register "generic.detect" = "1"
+				register "hid_desc_reg_offset" = "0x01"
+				device i2c 38 on end
+			end
+		end
+
+		device ref pcie5_0 on
+			# CPU PCIe RP#2 x8, Clock 14 (DGPU)
+			register "cpu_pcie_rp[CPU_RP(2)]" = "{
+				.clk_src = 14,
+				.clk_req = 14,
+				.flags = PCIE_RP_LTR | PCIE_RP_AER,
+			}"
+		end
+
+		device ref pcie_rp3 on
+			# PCH RP#3 x1, Clock 13 (GLAN)
+			register "pch_pcie_rp[PCH_RP(3)]" = "{
+				.clk_src = 13,
+				.clk_req = 13,
+				.flags = PCIE_RP_LTR | PCIE_RP_AER,
+			}"
+			device pci 00.0 on end
+		end
+
+		device ref pcie_rp5 on
+			# PCH RP#5 x1, Clock 12 (CARD)
+			register "pch_pcie_rp[PCH_RP(5)]" = "{
+				.clk_src = 12,
+				.clk_req = 12,
+				.flags = PCIE_RP_LTR | PCIE_RP_AER | PCIE_RP_HOTPLUG,
+			}"
+		end
+
+		device ref pcie_rp8 on
+			# PCH RP#8 x1, Clock 11 (WLAN)
+			register "pch_pcie_rp[PCH_RP(8)]" = "{
+				.clk_src = 11,
+				.clk_req = 11,
+				.flags = PCIE_RP_LTR | PCIE_RP_AER,
+			}"
+		end
+
+		device ref pcie_rp13 on
+			# PCH RP#13 x4, Clock 10 (SSD1)
+			register "pch_pcie_rp[PCH_RP(13)]" = "{
+				.clk_src = 10,
+				.clk_req = 10,
+				.flags = PCIE_RP_LTR, // XXX: AER spews warnings
+			}"
+		end
+
+		device ref pcie_rp21 on
+			# PCH RP#21 x4, Clock 5 (SSD2)
+			register "pch_pcie_rp[PCH_RP(21)]" = "{
+				.clk_src = 5,
+				.clk_req = 5,
+				.flags = PCIE_RP_LTR, // XXX: AER spews warnings
+			}"
+		end
+
+		device ref pcie_rp25 on
+			# PCH RP#25 x4, Clock 15 (TBT)
+			register "pch_pcie_rp[PCH_RP(25)]" = "{
+				.clk_src = 15,
+				.clk_req = 15,
+				.flags = PCIE_RP_LTR | PCIE_RP_HOTPLUG, // XXX: AER causes UnsupReq warnings
+			}"
+		end
+	end
+end
diff --git a/src/mainboard/system76/rpl/variants/serw13/romstage.c b/src/mainboard/system76/rpl/variants/serw13/romstage.c
new file mode 100644
index 0000000000..30a904544c
--- /dev/null
+++ b/src/mainboard/system76/rpl/variants/serw13/romstage.c
@@ -0,0 +1,32 @@
+/* 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_DDR5,
+		.ect = true,
+		.LpDdrDqDqsReTraining = 1,
+		.ddr_config = {
+			.dq_pins_interleaved = true,
+		},
+	};
+	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;
+
+	// Set primary display to internal graphics
+	mupd->FspmConfig.PrimaryDisplay = 0;
+
+	mupd->FspmConfig.DmiMaxLinkSpeed = 4;
+	mupd->FspmConfig.GpioOverride = 0;
+
+	memcfg_init(mupd, &board_cfg, &spd_info, half_populated);
+}