diff --git a/src/mainboard/asus/p8x7x-series/acpi/superio.asl b/src/mainboard/asus/p8x7x-series/acpi/superio.asl
index f2b35ba9c1..55b1db5b11 100644
--- a/src/mainboard/asus/p8x7x-series/acpi/superio.asl
+++ b/src/mainboard/asus/p8x7x-series/acpi/superio.asl
@@ -1 +1,3 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
 #include <drivers/pc80/pc/ps2_controller.asl>
diff --git a/src/mainboard/emulation/qemu-i440fx/acpi.h b/src/mainboard/emulation/qemu-i440fx/acpi.h
index 5fc860b743..b358912340 100644
--- a/src/mainboard/emulation/qemu-i440fx/acpi.h
+++ b/src/mainboard/emulation/qemu-i440fx/acpi.h
@@ -1,2 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
 unsigned long northbridge_write_acpi_tables(struct device *device,
 					    unsigned long start);
diff --git a/src/mainboard/google/kahlee/variants/grunt/include/variant/ec.h b/src/mainboard/google/kahlee/variants/grunt/include/variant/ec.h
index 96388ae5e0..ab9a071d76 100644
--- a/src/mainboard/google/kahlee/variants/grunt/include/variant/ec.h
+++ b/src/mainboard/google/kahlee/variants/grunt/include/variant/ec.h
@@ -1,3 +1,5 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
 #include <baseboard/ec.h>
 
 /* Enable EC backed Keyboard Backlight in ACPI */
diff --git a/src/mainboard/lenovo/t400/acpi/ec.asl b/src/mainboard/lenovo/t400/acpi/ec.asl
index cb3dd8710d..90d2fc781c 100644
--- a/src/mainboard/lenovo/t400/acpi/ec.asl
+++ b/src/mainboard/lenovo/t400/acpi/ec.asl
@@ -1,2 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
 #include <ec/lenovo/h8/acpi/ec.asl>
 #include <ec/lenovo/h8/acpi/thinkpad_bat_thresholds_24.asl>
diff --git a/src/mainboard/lenovo/x200/acpi/ec.asl b/src/mainboard/lenovo/x200/acpi/ec.asl
index cb3dd8710d..90d2fc781c 100644
--- a/src/mainboard/lenovo/x200/acpi/ec.asl
+++ b/src/mainboard/lenovo/x200/acpi/ec.asl
@@ -1,2 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
 #include <ec/lenovo/h8/acpi/ec.asl>
 #include <ec/lenovo/h8/acpi/thinkpad_bat_thresholds_24.asl>
diff --git a/src/mainboard/msi/h81m-p33/acpi/superio.asl b/src/mainboard/msi/h81m-p33/acpi/superio.asl
index f2b35ba9c1..55b1db5b11 100644
--- a/src/mainboard/msi/h81m-p33/acpi/superio.asl
+++ b/src/mainboard/msi/h81m-p33/acpi/superio.asl
@@ -1 +1,3 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
 #include <drivers/pc80/pc/ps2_controller.asl>
diff --git a/src/mainboard/packardbell/ms2290/acpi/superio.asl b/src/mainboard/packardbell/ms2290/acpi/superio.asl
index f2b35ba9c1..55b1db5b11 100644
--- a/src/mainboard/packardbell/ms2290/acpi/superio.asl
+++ b/src/mainboard/packardbell/ms2290/acpi/superio.asl
@@ -1 +1,3 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
 #include <drivers/pc80/pc/ps2_controller.asl>
diff --git a/src/soc/example/min86/chip.c b/src/soc/example/min86/chip.c
index dd09891e3c..38ce072023 100644
--- a/src/soc/example/min86/chip.c
+++ b/src/soc/example/min86/chip.c
@@ -1,3 +1,5 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
 #include <device/device.h>
 
 struct chip_operations soc_example_min86_ops = { NULL };