diff --git a/src/mainboard/system76/cml-u/acpi/ac.asl b/src/mainboard/system76/cml-u/acpi/ac.asl
index 6574c61e41..7326676198 100644
--- a/src/mainboard/system76/cml-u/acpi/ac.asl
+++ b/src/mainboard/system76/cml-u/acpi/ac.asl
@@ -1,17 +1,4 @@
-/*
- * This file is part of the coreboot project.
- *
- * Copyright (C) 2019 System76
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License as
- * published by the Free Software Foundation; version 2 of the License.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- */
+/* SPDX-License-Identifier: GPL-2.0-only */
 
 Device (AC)
 {
diff --git a/src/mainboard/system76/cml-u/acpi/battery.asl b/src/mainboard/system76/cml-u/acpi/battery.asl
index c1e6c6ce1d..bc239dd9c0 100644
--- a/src/mainboard/system76/cml-u/acpi/battery.asl
+++ b/src/mainboard/system76/cml-u/acpi/battery.asl
@@ -1,17 +1,4 @@
-/*
- * This file is part of the coreboot project.
- *
- * Copyright (C) 2019 System76
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License as
- * published by the Free Software Foundation; version 2 of the License.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- */
+/* SPDX-License-Identifier: GPL-2.0-only */
 
 Device (BAT0)
 {
diff --git a/src/mainboard/system76/cml-u/acpi/buttons.asl b/src/mainboard/system76/cml-u/acpi/buttons.asl
index 62847b5c09..81e61242bf 100644
--- a/src/mainboard/system76/cml-u/acpi/buttons.asl
+++ b/src/mainboard/system76/cml-u/acpi/buttons.asl
@@ -1,17 +1,4 @@
-/*
- * This file is part of the coreboot project.
- *
- * Copyright (C) 2019 System76
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; version 2 of the License.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- */
+/* SPDX-License-Identifier: GPL-2.0-only */
 
 Device (PWRB)
 {
diff --git a/src/mainboard/system76/cml-u/acpi/ec.asl b/src/mainboard/system76/cml-u/acpi/ec.asl
index c26670a009..f8496aed8c 100644
--- a/src/mainboard/system76/cml-u/acpi/ec.asl
+++ b/src/mainboard/system76/cml-u/acpi/ec.asl
@@ -1,17 +1,4 @@
-/*
- * This file is part of the coreboot project.
- *
- * Copyright (C) 2019 System76
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License as
- * published by the Free Software Foundation; version 2 of the License.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- */
+/* SPDX-License-Identifier: GPL-2.0-only */
 
 Device (EC0)
 {
diff --git a/src/mainboard/system76/cml-u/acpi/ec_ram.asl b/src/mainboard/system76/cml-u/acpi/ec_ram.asl
index 4bb452b6e3..d5f97edbd7 100644
--- a/src/mainboard/system76/cml-u/acpi/ec_ram.asl
+++ b/src/mainboard/system76/cml-u/acpi/ec_ram.asl
@@ -1,17 +1,4 @@
-/*
- * This file is part of the coreboot project.
- *
- * Copyright (C) 2019 System76
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License as
- * published by the Free Software Foundation; version 2 of the License.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- */
+/* SPDX-License-Identifier: GPL-2.0-only */
 
 OperationRegion (ERAM, EmbeddedControl, Zero, 0xFF)
 Field (ERAM, ByteAcc, Lock, Preserve)
diff --git a/src/mainboard/system76/cml-u/acpi/gpe.asl b/src/mainboard/system76/cml-u/acpi/gpe.asl
index e68c9cd306..c1bc04dc9a 100644
--- a/src/mainboard/system76/cml-u/acpi/gpe.asl
+++ b/src/mainboard/system76/cml-u/acpi/gpe.asl
@@ -1,17 +1,4 @@
-/*
- * This file is part of the coreboot project.
- *
- * Copyright (C) 2019 System76
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; version 2 of the License.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- */
+/* SPDX-License-Identifier: GPL-2.0-only */
 
 // GPP_D9 SCI
 Method (_L29, 0, Serialized) {
diff --git a/src/mainboard/system76/cml-u/acpi/hid.asl b/src/mainboard/system76/cml-u/acpi/hid.asl
index 1f151d5582..ce8fd3f28b 100644
--- a/src/mainboard/system76/cml-u/acpi/hid.asl
+++ b/src/mainboard/system76/cml-u/acpi/hid.asl
@@ -1,17 +1,4 @@
-/*
- * This file is part of the coreboot project.
- *
- * Copyright (C) 2019 System76
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License as
- * published by the Free Software Foundation; version 2 of the License.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- */
+/* SPDX-License-Identifier: GPL-2.0-only */
 
 Device (HIDD)
 {
diff --git a/src/mainboard/system76/cml-u/acpi/lid.asl b/src/mainboard/system76/cml-u/acpi/lid.asl
index 729a0d9090..ea382eb045 100644
--- a/src/mainboard/system76/cml-u/acpi/lid.asl
+++ b/src/mainboard/system76/cml-u/acpi/lid.asl
@@ -1,17 +1,4 @@
-/*
- * This file is part of the coreboot project.
- *
- * Copyright (C) 2019 System76
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License as
- * published by the Free Software Foundation; version 2 of the License.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- */
+/* SPDX-License-Identifier: GPL-2.0-only */
 
 Device (LID0)
 {
diff --git a/src/mainboard/system76/cml-u/acpi/mainboard.asl b/src/mainboard/system76/cml-u/acpi/mainboard.asl
index f75886036f..aa72098931 100644
--- a/src/mainboard/system76/cml-u/acpi/mainboard.asl
+++ b/src/mainboard/system76/cml-u/acpi/mainboard.asl
@@ -1,17 +1,3 @@
-/*
- * This file is part of the coreboot project.
- *
- * Copyright (C) 2019 System76
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; version 2 of the License.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- */
 
 #if defined(CONFIG_BOARD_SYSTEM76_DARP6)
 	#define COLOR_KEYBOARD 1
@@ -20,6 +6,7 @@
 #else
 	#error Unknown Mainboard
 #endif
+/* SPDX-License-Identifier: GPL-2.0-only */
 
 Scope (\_SB) {
 	#include "ac.asl"
diff --git a/src/mainboard/system76/cml-u/acpi/s76.asl b/src/mainboard/system76/cml-u/acpi/s76.asl
index e05d32d8fb..70417f9590 100644
--- a/src/mainboard/system76/cml-u/acpi/s76.asl
+++ b/src/mainboard/system76/cml-u/acpi/s76.asl
@@ -1,17 +1,4 @@
-/*
- * This file is part of the coreboot project.
- *
- * Copyright (C) 2019 System76
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License as
- * published by the Free Software Foundation; version 2 of the License.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- */
+/* SPDX-License-Identifier: GPL-2.0-only */
 
 // Notifications:
 //   0x80 - hardware backlight toggle
diff --git a/src/mainboard/system76/cml-u/acpi/sleep.asl b/src/mainboard/system76/cml-u/acpi/sleep.asl
index 9a3ecaa373..48c50e075e 100644
--- a/src/mainboard/system76/cml-u/acpi/sleep.asl
+++ b/src/mainboard/system76/cml-u/acpi/sleep.asl
@@ -1,17 +1,4 @@
-/*
- * This file is part of the coreboot project.
- *
- * Copyright (C) 2019 System76
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; version 2 of the License.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- */
+/* SPDX-License-Identifier: GPL-2.0-only */
 
 /* Method called from _PTS prior to enter sleep state */
 Method (MPTS, 1) {
diff --git a/src/mainboard/system76/cml-u/acpi/tbt.asl b/src/mainboard/system76/cml-u/acpi/tbt.asl
index cdf98cc350..e21fb6b4dc 100644
--- a/src/mainboard/system76/cml-u/acpi/tbt.asl
+++ b/src/mainboard/system76/cml-u/acpi/tbt.asl
@@ -1,17 +1,4 @@
-/*
- * This file is part of the coreboot project.
- *
- * Copyright (C) 2019 System76
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; version 2 of the License.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- */
+/* SPDX-License-Identifier: GPL-2.0-only */
 
 // See https://docs.microsoft.com/en-us/windows-hardware/drivers/pci/dsd-for-pcie-root-ports
 Scope(\_SB.PCI0.RP05) {
diff --git a/src/mainboard/system76/cml-u/bootblock.c b/src/mainboard/system76/cml-u/bootblock.c
index 00c4588f5f..2b673021b5 100644
--- a/src/mainboard/system76/cml-u/bootblock.c
+++ b/src/mainboard/system76/cml-u/bootblock.c
@@ -1,17 +1,4 @@
-/*
- * This file is part of the coreboot project.
- *
- * Copyright (C) 2019 System76
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; version 2 of the License.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- */
+/* SPDX-License-Identifier: GPL-2.0-only */
 
 #include <bootblock_common.h>
 #include <gpio.h>
diff --git a/src/mainboard/system76/cml-u/dsdt.asl b/src/mainboard/system76/cml-u/dsdt.asl
index 3d5f5a1225..7ae8ac4394 100644
--- a/src/mainboard/system76/cml-u/dsdt.asl
+++ b/src/mainboard/system76/cml-u/dsdt.asl
@@ -1,19 +1,4 @@
-/*
- * This file is part of the coreboot project.
- *
- * Copyright (C) 2007-2009 coresystems GmbH
- * Copyright (C) 2015 Google Inc.
- * Copyright (C) 2015 Intel Corporation
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; version 2 of the License.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- */
+/* SPDX-License-Identifier: GPL-2.0-only */
 
 #include <acpi/acpi.h>
 DefinitionBlock(
diff --git a/src/mainboard/system76/cml-u/gpio.h b/src/mainboard/system76/cml-u/gpio.h
index 569db0a3ea..dc68bffbac 100644
--- a/src/mainboard/system76/cml-u/gpio.h
+++ b/src/mainboard/system76/cml-u/gpio.h
@@ -1,17 +1,4 @@
-/*
- * This file is part of the coreboot project.
- *
- * Copyright (C) 2019 System76
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; version 2 of the License.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.See the
- * GNU General Public License for more details.
- */
+/* SPDX-License-Identifier: GPL-2.0-only */
 
 #ifndef MAINBOARD_GPIO_H
 #define MAINBOARD_GPIO_H
diff --git a/src/mainboard/system76/cml-u/ramstage.c b/src/mainboard/system76/cml-u/ramstage.c
index 6f028c100e..a3c4ffe5a0 100644
--- a/src/mainboard/system76/cml-u/ramstage.c
+++ b/src/mainboard/system76/cml-u/ramstage.c
@@ -1,17 +1,4 @@
-/*
- * This file is part of the coreboot project.
- *
- * Copyright (C) 2019 System76
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; version 2 of the License.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- */
+/* SPDX-License-Identifier: GPL-2.0-only */
 
 #include <string.h>
 #include <acpi/acpi.h>
diff --git a/src/mainboard/system76/cml-u/romstage.c b/src/mainboard/system76/cml-u/romstage.c
index e575ad3b87..8bf6168444 100644
--- a/src/mainboard/system76/cml-u/romstage.c
+++ b/src/mainboard/system76/cml-u/romstage.c
@@ -1,17 +1,4 @@
-/*
- * This file is part of the coreboot project.
- *
- * Copyright (C) 2019 System76
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; version 2 of the License.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- */
+/* SPDX-License-Identifier: GPL-2.0-only */
 
 #include <soc/cnl_memcfg_init.h>
 #include <soc/romstage.h>