diff --git a/src/mainboard/google/smaug/boardid.c b/src/mainboard/google/smaug/boardid.c
index bbff820a40..a60d335545 100644
--- a/src/mainboard/google/smaug/boardid.c
+++ b/src/mainboard/google/smaug/boardid.c
@@ -1,16 +1,5 @@
-/*
- * This file is part of the coreboot project.
- *
- *
- * 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 */
+/* This file is part of the coreboot project. */
 
 #include <boardid.h>
 #include <soc/sdram.h>
diff --git a/src/mainboard/google/smaug/bootblock.c b/src/mainboard/google/smaug/bootblock.c
index c50e20c70e..ec527e4d6b 100644
--- a/src/mainboard/google/smaug/bootblock.c
+++ b/src/mainboard/google/smaug/bootblock.c
@@ -1,16 +1,5 @@
-/*
- * This file is part of the coreboot project.
- *
- *
- * 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 */
+/* This file is part of the coreboot project. */
 
 #include <device/mmio.h>
 #include <bootblock_common.h>
diff --git a/src/mainboard/google/smaug/chromeos.c b/src/mainboard/google/smaug/chromeos.c
index 293f41e737..daad11694a 100644
--- a/src/mainboard/google/smaug/chromeos.c
+++ b/src/mainboard/google/smaug/chromeos.c
@@ -1,16 +1,5 @@
-/*
- * This file is part of the coreboot project.
- *
- *
- * 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 */
+/* This file is part of the coreboot project. */
 
 #include <bootmode.h>
 #include <boot/coreboot_tables.h>
diff --git a/src/mainboard/google/smaug/gpio.h b/src/mainboard/google/smaug/gpio.h
index 01cf76dcae..332a1332dc 100644
--- a/src/mainboard/google/smaug/gpio.h
+++ b/src/mainboard/google/smaug/gpio.h
@@ -1,16 +1,5 @@
-/*
- * This file is part of the coreboot project.
- *
- *
- * 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 */
+/* This file is part of the coreboot project. */
 
 #ifndef __MAINBOARD_GOOGLE_SMAUG_GPIO_H__
 #define __MAINBOARD_GOOGLE_SMAUG_GPIO_H__
diff --git a/src/mainboard/google/smaug/mainboard.c b/src/mainboard/google/smaug/mainboard.c
index 5795fda243..226a70aead 100644
--- a/src/mainboard/google/smaug/mainboard.c
+++ b/src/mainboard/google/smaug/mainboard.c
@@ -1,16 +1,5 @@
-/*
- * This file is part of the coreboot project.
- *
- *
- * 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 */
+/* This file is part of the coreboot project. */
 
 #include <device/mmio.h>
 #include <arch/mmu.h>
diff --git a/src/mainboard/google/smaug/memlayout.ld b/src/mainboard/google/smaug/memlayout.ld
index 2c3330651d..a6ccf155b6 100644
--- a/src/mainboard/google/smaug/memlayout.ld
+++ b/src/mainboard/google/smaug/memlayout.ld
@@ -1,14 +1,4 @@
-/*
- * This file is part of the coreboot project.
- *
- * 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 */
+/* This file is part of the coreboot project. */
 
 #include <soc/memlayout.ld>
diff --git a/src/mainboard/google/smaug/pmic.c b/src/mainboard/google/smaug/pmic.c
index 7e128fb23b..948508e5a5 100644
--- a/src/mainboard/google/smaug/pmic.c
+++ b/src/mainboard/google/smaug/pmic.c
@@ -1,16 +1,5 @@
-/*
- * This file is part of the coreboot project.
- *
- *
- * 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 */
+/* This file is part of the coreboot project. */
 
 #include <boardid.h>
 #include <console/console.h>
diff --git a/src/mainboard/google/smaug/pmic.h b/src/mainboard/google/smaug/pmic.h
index 643d714c17..fa6b4f65b9 100644
--- a/src/mainboard/google/smaug/pmic.h
+++ b/src/mainboard/google/smaug/pmic.h
@@ -1,16 +1,5 @@
-/*
- * This file is part of the coreboot project.
- *
- *
- * 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 */
+/* This file is part of the coreboot project. */
 
 #ifndef __MAINBOARD_GOOGLE_FOSTER_PMIC_H__
 #define __MAINBOARD_GOOGLE_FOSTER_PMIC_H__
diff --git a/src/mainboard/google/smaug/reset.c b/src/mainboard/google/smaug/reset.c
index 2fe55ee068..dfcfaa46c6 100644
--- a/src/mainboard/google/smaug/reset.c
+++ b/src/mainboard/google/smaug/reset.c
@@ -1,16 +1,5 @@
-/*
- * This file is part of the coreboot project.
- *
- *
- * 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 */
+/* This file is part of the coreboot project. */
 
 #include <reset.h>
 
diff --git a/src/mainboard/google/smaug/romstage.c b/src/mainboard/google/smaug/romstage.c
index 37187d835f..22c8ccc48e 100644
--- a/src/mainboard/google/smaug/romstage.c
+++ b/src/mainboard/google/smaug/romstage.c
@@ -1,16 +1,5 @@
-/*
- * This file is part of the coreboot project.
- *
- *
- * 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 */
+/* This file is part of the coreboot project. */
 
 #include <soc/addressmap.h>
 #include <device/i2c_simple.h>
diff --git a/src/mainboard/google/smaug/sdram_configs.c b/src/mainboard/google/smaug/sdram_configs.c
index 02c871546f..58fdb008dd 100644
--- a/src/mainboard/google/smaug/sdram_configs.c
+++ b/src/mainboard/google/smaug/sdram_configs.c
@@ -1,16 +1,5 @@
-/*
- * This file is part of the coreboot project.
- *
- *
- * 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 */
+/* This file is part of the coreboot project. */
 
 #include <console/console.h>
 #include <soc/sdram_configs.h>