diff --git a/src/mainboard/system76/addw1/devicetree.cb b/src/mainboard/system76/addw1/devicetree.cb
index 529767c..16827ddb 100644
--- a/src/mainboard/system76/addw1/devicetree.cb
+++ b/src/mainboard/system76/addw1/devicetree.cb
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: GPL-2.0-only
+
 chip soc/intel/cannonlake
 	register "common_soc_config" = "{
 		// Touchpad I2C bus
diff --git a/src/mainboard/system76/addw1/variants/addw1/overridetree.cb b/src/mainboard/system76/addw1/variants/addw1/overridetree.cb
index fa327fd..b1fab29 100644
--- a/src/mainboard/system76/addw1/variants/addw1/overridetree.cb
+++ b/src/mainboard/system76/addw1/variants/addw1/overridetree.cb
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: GPL-2.0-only
+
 chip soc/intel/cannonlake
 	# Serial I/O
 	register "SerialIoDevMode" = "{
diff --git a/src/mainboard/system76/addw1/variants/addw2/overridetree.cb b/src/mainboard/system76/addw1/variants/addw2/overridetree.cb
index 40e2128..3b9c562 100644
--- a/src/mainboard/system76/addw1/variants/addw2/overridetree.cb
+++ b/src/mainboard/system76/addw1/variants/addw2/overridetree.cb
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: GPL-2.0-only
+
 chip soc/intel/cannonlake
 	# Serial I/O
 	register "SerialIoDevMode" = "{
diff --git a/src/mainboard/system76/adl/devicetree.cb b/src/mainboard/system76/adl/devicetree.cb
index 9a78415..9a7a149 100644
--- a/src/mainboard/system76/adl/devicetree.cb
+++ b/src/mainboard/system76/adl/devicetree.cb
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: GPL-2.0-only
+
 chip soc/intel/alderlake
 	register "common_soc_config" = "{
 		// Touchpad I2C bus
diff --git a/src/mainboard/system76/adl/variants/darp8/overridetree.cb b/src/mainboard/system76/adl/variants/darp8/overridetree.cb
index 73d016f..7a7e14e 100644
--- a/src/mainboard/system76/adl/variants/darp8/overridetree.cb
+++ b/src/mainboard/system76/adl/variants/darp8/overridetree.cb
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: GPL-2.0-only
+
 chip soc/intel/alderlake
 	register "power_limits_config[ADL_P_282_442_482_28W_CORE]" = "{
 		.tdp_pl1_override = 20,
diff --git a/src/mainboard/system76/adl/variants/galp6/overridetree.cb b/src/mainboard/system76/adl/variants/galp6/overridetree.cb
index a0a0ad2..79c614e 100644
--- a/src/mainboard/system76/adl/variants/galp6/overridetree.cb
+++ b/src/mainboard/system76/adl/variants/galp6/overridetree.cb
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: GPL-2.0-only
+
 chip soc/intel/alderlake
 	register "power_limits_config[ADL_P_282_442_482_28W_CORE]" = "{
 		.tdp_pl1_override = 28,
diff --git a/src/mainboard/system76/adl/variants/gaze17-3050/overridetree.cb b/src/mainboard/system76/adl/variants/gaze17-3050/overridetree.cb
index 960ead6..603879b 100644
--- a/src/mainboard/system76/adl/variants/gaze17-3050/overridetree.cb
+++ b/src/mainboard/system76/adl/variants/gaze17-3050/overridetree.cb
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: GPL-2.0-only
+
 chip soc/intel/alderlake
 	# FIVR configuration
 	#   Read EXT_RAIL_CONFIG to determine bitmaps
diff --git a/src/mainboard/system76/adl/variants/gaze17-3060-b/overridetree.cb b/src/mainboard/system76/adl/variants/gaze17-3060-b/overridetree.cb
index 74b87ee..a9c614e4 100644
--- a/src/mainboard/system76/adl/variants/gaze17-3060-b/overridetree.cb
+++ b/src/mainboard/system76/adl/variants/gaze17-3060-b/overridetree.cb
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: GPL-2.0-only
+
 chip soc/intel/alderlake
 	# FIVR configuration
 	#   Read EXT_RAIL_CONFIG to determine bitmaps
diff --git a/src/mainboard/system76/adl/variants/lemp11/overridetree.cb b/src/mainboard/system76/adl/variants/lemp11/overridetree.cb
index 1e65248..10c6bfcf 100644
--- a/src/mainboard/system76/adl/variants/lemp11/overridetree.cb
+++ b/src/mainboard/system76/adl/variants/lemp11/overridetree.cb
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: GPL-2.0-only
+
 chip soc/intel/alderlake
 	register "power_limits_config[ADL_P_142_242_282_15W_CORE]" = "{
 		.tdp_pl1_override = 15,
diff --git a/src/mainboard/system76/adl/variants/oryp10/overridetree.cb b/src/mainboard/system76/adl/variants/oryp10/overridetree.cb
index efebe7a..09f07b6 100644
--- a/src/mainboard/system76/adl/variants/oryp10/overridetree.cb
+++ b/src/mainboard/system76/adl/variants/oryp10/overridetree.cb
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: GPL-2.0-only
+
 chip soc/intel/alderlake
 	register "power_limits_config[ADL_P_642_682_45W_CORE]" = "{
 		.tdp_pl1_override = 45,
diff --git a/src/mainboard/system76/adl/variants/oryp9/overridetree.cb b/src/mainboard/system76/adl/variants/oryp9/overridetree.cb
index 2f79c9e..4ca81ab 100644
--- a/src/mainboard/system76/adl/variants/oryp9/overridetree.cb
+++ b/src/mainboard/system76/adl/variants/oryp9/overridetree.cb
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: GPL-2.0-only
+
 chip soc/intel/alderlake
 	register "power_limits_config[ADL_P_642_682_45W_CORE]" = "{
 		.tdp_pl1_override = 45,
diff --git a/src/mainboard/system76/bonw14/devicetree.cb b/src/mainboard/system76/bonw14/devicetree.cb
index d79aa76..aa7d1ab 100644
--- a/src/mainboard/system76/bonw14/devicetree.cb
+++ b/src/mainboard/system76/bonw14/devicetree.cb
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: GPL-2.0-only
+
 chip soc/intel/cannonlake
 	register "common_soc_config" = "{
 		// Touchpad I2C bus
diff --git a/src/mainboard/system76/cml-u/devicetree.cb b/src/mainboard/system76/cml-u/devicetree.cb
index 90c5b71..07c56b4 100644
--- a/src/mainboard/system76/cml-u/devicetree.cb
+++ b/src/mainboard/system76/cml-u/devicetree.cb
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: GPL-2.0-only
+
 chip soc/intel/cannonlake
 	register "common_soc_config" = "{
 		/* Touchpad */
diff --git a/src/mainboard/system76/cml-u/variants/darp6/overridetree.cb b/src/mainboard/system76/cml-u/variants/darp6/overridetree.cb
index b349762..17b1ba1 100644
--- a/src/mainboard/system76/cml-u/variants/darp6/overridetree.cb
+++ b/src/mainboard/system76/cml-u/variants/darp6/overridetree.cb
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: GPL-2.0-only
+
 chip soc/intel/cannonlake
 	device domain 0 on
 		subsystemid 0x1558 0x1404 inherit
diff --git a/src/mainboard/system76/cml-u/variants/galp4/overridetree.cb b/src/mainboard/system76/cml-u/variants/galp4/overridetree.cb
index bbfc2ea..9c747cf 100644
--- a/src/mainboard/system76/cml-u/variants/galp4/overridetree.cb
+++ b/src/mainboard/system76/cml-u/variants/galp4/overridetree.cb
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: GPL-2.0-only
+
 chip soc/intel/cannonlake
 	device domain 0 on
 		subsystemid 0x1558 0x1403 inherit
diff --git a/src/mainboard/system76/cml-u/variants/lemp9/overridetree.cb b/src/mainboard/system76/cml-u/variants/lemp9/overridetree.cb
index 164774a..2279cb3 100644
--- a/src/mainboard/system76/cml-u/variants/lemp9/overridetree.cb
+++ b/src/mainboard/system76/cml-u/variants/lemp9/overridetree.cb
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: GPL-2.0-only
+
 chip soc/intel/cannonlake
 	device domain 0 on
 		subsystemid 0x1558 0x1401 inherit
diff --git a/src/mainboard/system76/gaze15/devicetree.cb b/src/mainboard/system76/gaze15/devicetree.cb
index 4ae412d..f80c45c 100644
--- a/src/mainboard/system76/gaze15/devicetree.cb
+++ b/src/mainboard/system76/gaze15/devicetree.cb
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: GPL-2.0-only
+
 chip soc/intel/cannonlake
 	register "common_soc_config" = "{
 		// Touchpad I2C bus
diff --git a/src/mainboard/system76/gaze15/variants/gaze14/overridetree.cb b/src/mainboard/system76/gaze15/variants/gaze14/overridetree.cb
index 0cfd040..e94d703 100644
--- a/src/mainboard/system76/gaze15/variants/gaze14/overridetree.cb
+++ b/src/mainboard/system76/gaze15/variants/gaze14/overridetree.cb
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: GPL-2.0-only
+
 chip soc/intel/cannonlake
 	# Serial I/O
 	register "SerialIoDevMode" = "{
diff --git a/src/mainboard/system76/gaze15/variants/gaze15/overridetree.cb b/src/mainboard/system76/gaze15/variants/gaze15/overridetree.cb
index 9f64b5f..02275df 100644
--- a/src/mainboard/system76/gaze15/variants/gaze15/overridetree.cb
+++ b/src/mainboard/system76/gaze15/variants/gaze15/overridetree.cb
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: GPL-2.0-only
+
 chip soc/intel/cannonlake
 	# Serial I/O
 	register "SerialIoDevMode" = "{
diff --git a/src/mainboard/system76/kbl-u/devicetree.cb b/src/mainboard/system76/kbl-u/devicetree.cb
index 3b84d7f..da3327a 100644
--- a/src/mainboard/system76/kbl-u/devicetree.cb
+++ b/src/mainboard/system76/kbl-u/devicetree.cb
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: GPL-2.0-only
+
 chip soc/intel/skylake
 	# Send an extra VR mailbox command for the PS4 exit issue
 	register "SendVrMbxCmd" = "2"
diff --git a/src/mainboard/system76/kbl-u/variants/galp2/overridetree.cb b/src/mainboard/system76/kbl-u/variants/galp2/overridetree.cb
index 9e042a3..8fb495b 100644
--- a/src/mainboard/system76/kbl-u/variants/galp2/overridetree.cb
+++ b/src/mainboard/system76/kbl-u/variants/galp2/overridetree.cb
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: GPL-2.0-only
+
 chip soc/intel/skylake
 	device domain 0 on
 		subsystemid 0x1558 0x1303 inherit
diff --git a/src/mainboard/system76/kbl-u/variants/galp3-b/overridetree.cb b/src/mainboard/system76/kbl-u/variants/galp3-b/overridetree.cb
index 134fbec..5cc90b26 100644
--- a/src/mainboard/system76/kbl-u/variants/galp3-b/overridetree.cb
+++ b/src/mainboard/system76/kbl-u/variants/galp3-b/overridetree.cb
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: GPL-2.0-only
+
 chip soc/intel/skylake
 	device domain 0 on
 		subsystemid 0x1558 0x1413 inherit
diff --git a/src/mainboard/system76/kbl-u/variants/galp3/overridetree.cb b/src/mainboard/system76/kbl-u/variants/galp3/overridetree.cb
index 8a61f28..d18dfa4 100644
--- a/src/mainboard/system76/kbl-u/variants/galp3/overridetree.cb
+++ b/src/mainboard/system76/kbl-u/variants/galp3/overridetree.cb
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: GPL-2.0-only
+
 chip soc/intel/skylake
 	device domain 0 on
 		subsystemid 0x1558 0x1313 inherit
diff --git a/src/mainboard/system76/oryp5/devicetree.cb b/src/mainboard/system76/oryp5/devicetree.cb
index f17862f..ae52165 100644
--- a/src/mainboard/system76/oryp5/devicetree.cb
+++ b/src/mainboard/system76/oryp5/devicetree.cb
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: GPL-2.0-only
+
 chip soc/intel/cannonlake
 	register "common_soc_config" = "{
 		// Touchpad I2C bus
diff --git a/src/mainboard/system76/oryp6/devicetree.cb b/src/mainboard/system76/oryp6/devicetree.cb
index c0c1b4a..abf68b9 100644
--- a/src/mainboard/system76/oryp6/devicetree.cb
+++ b/src/mainboard/system76/oryp6/devicetree.cb
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: GPL-2.0-only
+
 chip soc/intel/cannonlake
 	register "common_soc_config" = "{
 		// Touchpad I2C bus
diff --git a/src/mainboard/system76/oryp6/variants/oryp6/overridetree.cb b/src/mainboard/system76/oryp6/variants/oryp6/overridetree.cb
index 3d6355e..3b2748f 100644
--- a/src/mainboard/system76/oryp6/variants/oryp6/overridetree.cb
+++ b/src/mainboard/system76/oryp6/variants/oryp6/overridetree.cb
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: GPL-2.0-only
+
 chip soc/intel/cannonlake
 	device domain 0 on
 		subsystemid 0x1558 0x50d3 inherit
diff --git a/src/mainboard/system76/oryp6/variants/oryp7/overridetree.cb b/src/mainboard/system76/oryp6/variants/oryp7/overridetree.cb
index 3be1b15..b9bb816 100644
--- a/src/mainboard/system76/oryp6/variants/oryp7/overridetree.cb
+++ b/src/mainboard/system76/oryp6/variants/oryp7/overridetree.cb
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: GPL-2.0-only
+
 chip soc/intel/cannonlake
 	device domain 0 on
 		subsystemid 0x1558 0x65e5 inherit
diff --git a/src/mainboard/system76/rpl/devicetree.cb b/src/mainboard/system76/rpl/devicetree.cb
index 4fd50fd..749ce53 100644
--- a/src/mainboard/system76/rpl/devicetree.cb
+++ b/src/mainboard/system76/rpl/devicetree.cb
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: GPL-2.0-only
+
 chip soc/intel/alderlake
 	register "common_soc_config" = "{
 		// Touchpad I2C bus
diff --git a/src/mainboard/system76/rpl/variants/addw3/overridetree.cb b/src/mainboard/system76/rpl/variants/addw3/overridetree.cb
index 9b8d453..24c272c 100644
--- a/src/mainboard/system76/rpl/variants/addw3/overridetree.cb
+++ b/src/mainboard/system76/rpl/variants/addw3/overridetree.cb
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: GPL-2.0-only
+
 chip soc/intel/alderlake
 	# Support 5600 MT/s memory
 	register "max_dram_speed_mts" = "5600"
diff --git a/src/mainboard/system76/rpl/variants/bonw15/overridetree.cb b/src/mainboard/system76/rpl/variants/bonw15/overridetree.cb
index fde40f6..a1191a5 100644
--- a/src/mainboard/system76/rpl/variants/bonw15/overridetree.cb
+++ b/src/mainboard/system76/rpl/variants/bonw15/overridetree.cb
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: GPL-2.0-only
+
 chip soc/intel/alderlake
 	# Support 5600 MT/s memory
 	register "max_dram_speed_mts" = "5600"
diff --git a/src/mainboard/system76/rpl/variants/darp9/overridetree.cb b/src/mainboard/system76/rpl/variants/darp9/overridetree.cb
index fc9b49a..3dc2786 100644
--- a/src/mainboard/system76/rpl/variants/darp9/overridetree.cb
+++ b/src/mainboard/system76/rpl/variants/darp9/overridetree.cb
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: GPL-2.0-only
+
 chip soc/intel/alderlake
 	register "power_limits_config[RPL_P_682_482_282_28W_CORE]" = "{
 		.tdp_pl1_override = 20,
diff --git a/src/mainboard/system76/rpl/variants/galp7/overridetree.cb b/src/mainboard/system76/rpl/variants/galp7/overridetree.cb
index 0c0aec3..cc060e4 100644
--- a/src/mainboard/system76/rpl/variants/galp7/overridetree.cb
+++ b/src/mainboard/system76/rpl/variants/galp7/overridetree.cb
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: GPL-2.0-only
+
 chip soc/intel/alderlake
 	register "power_limits_config[RPL_P_682_642_482_45W_CORE]" = "{
 		.tdp_pl1_override = 45,
diff --git a/src/mainboard/system76/rpl/variants/gaze18/overridetree.cb b/src/mainboard/system76/rpl/variants/gaze18/overridetree.cb
index 4c11595..636d57c 100644
--- a/src/mainboard/system76/rpl/variants/gaze18/overridetree.cb
+++ b/src/mainboard/system76/rpl/variants/gaze18/overridetree.cb
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: GPL-2.0-only
+
 chip soc/intel/alderlake
 	device domain 0 on
 		subsystemid 0x1558 0x5630 inherit
diff --git a/src/mainboard/system76/rpl/variants/lemp12/overridetree.cb b/src/mainboard/system76/rpl/variants/lemp12/overridetree.cb
index 34950cc..c84628b 100644
--- a/src/mainboard/system76/rpl/variants/lemp12/overridetree.cb
+++ b/src/mainboard/system76/rpl/variants/lemp12/overridetree.cb
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: GPL-2.0-only
+
 chip soc/intel/alderlake
 	register "power_limits_config[RPL_P_282_242_142_15W_CORE]" = "{
 		.tdp_pl1_override = 15,
diff --git a/src/mainboard/system76/rpl/variants/oryp11/overridetree.cb b/src/mainboard/system76/rpl/variants/oryp11/overridetree.cb
index d337a57..57bc594 100644
--- a/src/mainboard/system76/rpl/variants/oryp11/overridetree.cb
+++ b/src/mainboard/system76/rpl/variants/oryp11/overridetree.cb
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: GPL-2.0-only
+
 chip soc/intel/alderlake
 	device domain 0 on
 		subsystemid 0x1558 0x66a2 inherit
diff --git a/src/mainboard/system76/rpl/variants/serw13/overridetree.cb b/src/mainboard/system76/rpl/variants/serw13/overridetree.cb
index b261d59..cc89764 100644
--- a/src/mainboard/system76/rpl/variants/serw13/overridetree.cb
+++ b/src/mainboard/system76/rpl/variants/serw13/overridetree.cb
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: GPL-2.0-only
+
 chip soc/intel/alderlake
 	# Support 5600 MT/s memory
 	register "max_dram_speed_mts" = "5600"
diff --git a/src/mainboard/system76/tgl-h/devicetree.cb b/src/mainboard/system76/tgl-h/devicetree.cb
index 353a96d..11b85ce 100644
--- a/src/mainboard/system76/tgl-h/devicetree.cb
+++ b/src/mainboard/system76/tgl-h/devicetree.cb
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: GPL-2.0-only
+
 chip soc/intel/tigerlake
 	register "common_soc_config" = "{
 		// Touchpad I2C bus
diff --git a/src/mainboard/system76/tgl-h/variants/gaze16-3050/overridetree.cb b/src/mainboard/system76/tgl-h/variants/gaze16-3050/overridetree.cb
index ad90eab..6ac474d 100644
--- a/src/mainboard/system76/tgl-h/variants/gaze16-3050/overridetree.cb
+++ b/src/mainboard/system76/tgl-h/variants/gaze16-3050/overridetree.cb
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: GPL-2.0-only
+
 chip soc/intel/tigerlake
 	device domain 0 on
 		subsystemid 0x1558 0x5015 inherit
diff --git a/src/mainboard/system76/tgl-h/variants/gaze16-3060/overridetree.cb b/src/mainboard/system76/tgl-h/variants/gaze16-3060/overridetree.cb
index bfbc5c5..b4b62fa 100644
--- a/src/mainboard/system76/tgl-h/variants/gaze16-3060/overridetree.cb
+++ b/src/mainboard/system76/tgl-h/variants/gaze16-3060/overridetree.cb
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: GPL-2.0-only
+
 chip soc/intel/tigerlake
 	device domain 0 on
 		subsystemid 0x1558 0x50e1 inherit
diff --git a/src/mainboard/system76/tgl-h/variants/oryp8/overridetree.cb b/src/mainboard/system76/tgl-h/variants/oryp8/overridetree.cb
index a09cf30..0967154 100644
--- a/src/mainboard/system76/tgl-h/variants/oryp8/overridetree.cb
+++ b/src/mainboard/system76/tgl-h/variants/oryp8/overridetree.cb
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: GPL-2.0-only
+
 chip soc/intel/tigerlake
 	# Power limits
 	register "power_limits_config[POWER_LIMITS_H_8_CORE]" = "{
diff --git a/src/mainboard/system76/tgl-u/devicetree.cb b/src/mainboard/system76/tgl-u/devicetree.cb
index f056da7..ae80a32 100644
--- a/src/mainboard/system76/tgl-u/devicetree.cb
+++ b/src/mainboard/system76/tgl-u/devicetree.cb
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: GPL-2.0-only
+
 chip soc/intel/tigerlake
 	register "common_soc_config" = "{
 		// Touchpad I2C bus
diff --git a/src/mainboard/system76/tgl-u/variants/darp7/overridetree.cb b/src/mainboard/system76/tgl-u/variants/darp7/overridetree.cb
index a35dc52..b263c5a 100644
--- a/src/mainboard/system76/tgl-u/variants/darp7/overridetree.cb
+++ b/src/mainboard/system76/tgl-u/variants/darp7/overridetree.cb
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: GPL-2.0-only
+
 chip soc/intel/tigerlake
 	# Power limits
 	register "power_limits_config[POWER_LIMITS_U_4_CORE]" = "{
diff --git a/src/mainboard/system76/tgl-u/variants/galp5/overridetree.cb b/src/mainboard/system76/tgl-u/variants/galp5/overridetree.cb
index 075a2e4..7cfc62b 100644
--- a/src/mainboard/system76/tgl-u/variants/galp5/overridetree.cb
+++ b/src/mainboard/system76/tgl-u/variants/galp5/overridetree.cb
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: GPL-2.0-only
+
 chip soc/intel/tigerlake
 	# Power limits
 	register "power_limits_config[POWER_LIMITS_U_4_CORE]" = "{
diff --git a/src/mainboard/system76/tgl-u/variants/lemp10/overridetree.cb b/src/mainboard/system76/tgl-u/variants/lemp10/overridetree.cb
index ce45079..a4e3052 100644
--- a/src/mainboard/system76/tgl-u/variants/lemp10/overridetree.cb
+++ b/src/mainboard/system76/tgl-u/variants/lemp10/overridetree.cb
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: GPL-2.0-only
+
 chip soc/intel/tigerlake
 	# Power limits
 	register "power_limits_config[POWER_LIMITS_U_4_CORE]" = "{
diff --git a/src/mainboard/system76/whl-u/devicetree.cb b/src/mainboard/system76/whl-u/devicetree.cb
index 0899f62..6607f45 100644
--- a/src/mainboard/system76/whl-u/devicetree.cb
+++ b/src/mainboard/system76/whl-u/devicetree.cb
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: GPL-2.0-only
+
 chip soc/intel/cannonlake
 	# Lock Down
 	register "common_soc_config" = "{
diff --git a/src/mainboard/system76/whl-u/variants/darp5/overridetree.cb b/src/mainboard/system76/whl-u/variants/darp5/overridetree.cb
index b9c9de7..c72111a 100644
--- a/src/mainboard/system76/whl-u/variants/darp5/overridetree.cb
+++ b/src/mainboard/system76/whl-u/variants/darp5/overridetree.cb
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: GPL-2.0-only
+
 chip soc/intel/cannonlake
 	device domain 0 on
 		subsystemid 0x1558 0x1325 inherit
diff --git a/src/mainboard/system76/whl-u/variants/galp3-c/overridetree.cb b/src/mainboard/system76/whl-u/variants/galp3-c/overridetree.cb
index 022be95..4556940 100644
--- a/src/mainboard/system76/whl-u/variants/galp3-c/overridetree.cb
+++ b/src/mainboard/system76/whl-u/variants/galp3-c/overridetree.cb
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: GPL-2.0-only
+
 chip soc/intel/cannonlake
 	device domain 0 on
 		subsystemid 0x1558 0x1323 inherit