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-rw-r--r--src/mainboard/apple/macbook21/Makefile.inc2
-rw-r--r--src/mainboard/apple/macbookair4_2/Makefile.inc2
-rw-r--r--src/mainboard/asrock/b85m_pro4/Makefile.inc2
-rw-r--r--src/mainboard/asrock/g41c-gs/Makefile.inc2
-rw-r--r--src/mainboard/asus/p2b/Makefile.inc2
-rw-r--r--src/mainboard/asus/p5gc-mx/Makefile.inc2
-rw-r--r--src/mainboard/asus/p5qpl-am/Makefile.inc2
-rw-r--r--src/mainboard/biostar/th61-itx/Makefile.inc2
-rw-r--r--src/mainboard/bytedance/bd_egs/Makefile.inc2
-rw-r--r--src/mainboard/clevo/cml-u/Makefile.inc2
-rw-r--r--src/mainboard/clevo/cml-u/variants/l140cu/Makefile.inc2
-rw-r--r--src/mainboard/clevo/tgl-u/Makefile.inc2
-rw-r--r--src/mainboard/clevo/tgl-u/variants/l140mu/Makefile.inc2
-rw-r--r--src/mainboard/compulab/intense_pc/Makefile.inc2
-rw-r--r--src/mainboard/emulation/qemu-i440fx/Makefile.inc2
-rw-r--r--src/mainboard/emulation/qemu-q35/Makefile.inc2
-rw-r--r--src/mainboard/foxconn/d41s/Makefile.inc2
-rw-r--r--src/mainboard/foxconn/g41s-k/Makefile.inc2
-rw-r--r--src/mainboard/gigabyte/ga-945gcm-s2l/Makefile.inc2
-rw-r--r--src/mainboard/gigabyte/ga-g41m-es2l/Makefile.inc2
-rw-r--r--src/mainboard/gigabyte/ga-h61m-series/Makefile.inc2
-rw-r--r--src/mainboard/google/asurada/Makefile.inc2
-rw-r--r--src/mainboard/google/asurada/sdram_params/Makefile.inc2
-rw-r--r--src/mainboard/google/brya/Makefile.inc2
-rw-r--r--src/mainboard/google/brya/variants/aurash/Makefile.inc2
-rw-r--r--src/mainboard/google/brya/variants/baseboard/brask/Makefile.inc2
-rw-r--r--src/mainboard/google/brya/variants/baseboard/brya/Makefile.inc2
-rw-r--r--src/mainboard/google/brya/variants/baseboard/hades/Makefile.inc2
-rw-r--r--src/mainboard/google/brya/variants/baseboard/nissa/Makefile.inc2
-rw-r--r--src/mainboard/google/brya/variants/brya0/Makefile.inc2
-rw-r--r--src/mainboard/google/brya/variants/crota/Makefile.inc2
-rw-r--r--src/mainboard/google/brya/variants/gaelin/Makefile.inc2
-rw-r--r--src/mainboard/google/brya/variants/gothrax/Makefile.inc2
-rw-r--r--src/mainboard/google/brya/variants/hades/Makefile.inc2
-rw-r--r--src/mainboard/google/brya/variants/moli/Makefile.inc2
-rw-r--r--src/mainboard/google/brya/variants/skolas/Makefile.inc2
-rw-r--r--src/mainboard/google/brya/variants/skolas4es/Makefile.inc2
-rw-r--r--src/mainboard/google/brya/variants/taeko/Makefile.inc2
-rw-r--r--src/mainboard/google/brya/variants/taeko4es/Makefile.inc2
-rw-r--r--src/mainboard/google/brya/variants/taniks/Makefile.inc2
-rw-r--r--src/mainboard/google/cherry/Makefile.inc2
-rw-r--r--src/mainboard/google/corsola/Makefile.inc2
-rw-r--r--src/mainboard/google/dedede/Makefile.inc2
-rw-r--r--src/mainboard/google/dedede/variants/baseboard/Makefile.inc2
-rw-r--r--src/mainboard/google/fizz/variants/baseboard/Makefile.inc2
-rw-r--r--src/mainboard/google/fizz/variants/endeavour/Makefile.inc2
-rw-r--r--src/mainboard/google/fizz/variants/karma/Makefile.inc2
-rw-r--r--src/mainboard/google/geralt/Makefile.inc2
-rw-r--r--src/mainboard/google/guybrush/variants/baseboard/Makefile.inc2
-rw-r--r--src/mainboard/google/kukui/Makefile.inc2
-rw-r--r--src/mainboard/google/kukui/sdram_params/Makefile.inc2
-rw-r--r--src/mainboard/google/mistral/Makefile.inc1
-rw-r--r--src/mainboard/google/myst/variants/baseboard/Makefile.inc2
-rw-r--r--src/mainboard/google/octopus/Makefile.inc2
-rw-r--r--src/mainboard/google/octopus/variants/ampton/Makefile.inc2
-rw-r--r--src/mainboard/google/octopus/variants/baseboard/Makefile.inc2
-rw-r--r--src/mainboard/google/octopus/variants/bloog/Makefile.inc2
-rw-r--r--src/mainboard/google/octopus/variants/bobba/Makefile.inc2
-rw-r--r--src/mainboard/google/octopus/variants/casta/Makefile.inc2
-rw-r--r--src/mainboard/google/octopus/variants/dood/Makefile.inc2
-rw-r--r--src/mainboard/google/octopus/variants/fleex/Makefile.inc2
-rw-r--r--src/mainboard/google/octopus/variants/foob/Makefile.inc2
-rw-r--r--src/mainboard/google/octopus/variants/garg/Makefile.inc2
-rw-r--r--src/mainboard/google/octopus/variants/lick/Makefile.inc2
-rw-r--r--src/mainboard/google/octopus/variants/meep/Makefile.inc2
-rw-r--r--src/mainboard/google/octopus/variants/phaser/Makefile.inc2
-rw-r--r--src/mainboard/google/octopus/variants/yorp/Makefile.inc2
-rw-r--r--src/mainboard/google/poppy/spd/Makefile.inc1
-rw-r--r--src/mainboard/google/poppy/variants/atlas/Makefile.inc1
-rw-r--r--src/mainboard/google/poppy/variants/baseboard/Makefile.inc2
-rw-r--r--src/mainboard/google/poppy/variants/nami/Makefile.inc1
-rw-r--r--src/mainboard/google/poppy/variants/nautilus/Makefile.inc1
-rw-r--r--src/mainboard/google/poppy/variants/nocturne/Makefile.inc1
-rw-r--r--src/mainboard/google/poppy/variants/poppy/Makefile.inc1
-rw-r--r--src/mainboard/google/poppy/variants/rammus/Makefile.inc2
-rw-r--r--src/mainboard/google/poppy/variants/soraka/Makefile.inc1
-rw-r--r--src/mainboard/google/reef/Makefile.inc2
-rw-r--r--src/mainboard/google/reef/variants/baseboard/Makefile.inc2
-rw-r--r--src/mainboard/google/reef/variants/coral/Makefile.inc2
-rw-r--r--src/mainboard/google/reef/variants/pyro/Makefile.inc2
-rw-r--r--src/mainboard/google/reef/variants/snappy/Makefile.inc2
-rw-r--r--src/mainboard/google/rex/Makefile.inc2
-rw-r--r--src/mainboard/google/rex/variants/baseboard/ovis/Makefile.inc2
-rw-r--r--src/mainboard/google/rex/variants/baseboard/rex/Makefile.inc2
-rw-r--r--src/mainboard/google/rex/variants/karis/Makefile.inc2
-rw-r--r--src/mainboard/google/rex/variants/ovis/Makefile.inc2
-rw-r--r--src/mainboard/google/rex/variants/rex0/Makefile.inc2
-rw-r--r--src/mainboard/google/rex/variants/screebo/Makefile.inc2
-rw-r--r--src/mainboard/google/skyrim/variants/baseboard/Makefile.inc2
-rw-r--r--src/mainboard/hp/compaq_8200_elite_sff/Makefile.inc2
-rw-r--r--src/mainboard/hp/compaq_elite_8300_usdt/Makefile.inc2
-rw-r--r--src/mainboard/hp/folio_9480m/Makefile.inc2
-rw-r--r--src/mainboard/hp/z220_series/Makefile.inc2
-rw-r--r--src/mainboard/ibase/mb899/Makefile.inc2
-rw-r--r--src/mainboard/ibm/sbp1/Makefile.inc2
-rw-r--r--src/mainboard/intel/apollolake_rvp/Makefile.inc2
-rw-r--r--src/mainboard/intel/archercity_crb/Makefile.inc2
-rw-r--r--src/mainboard/intel/cedarisland_crb/Makefile.inc2
-rw-r--r--src/mainboard/intel/coffeelake_rvp/variants/baseboard/Makefile.inc2
-rw-r--r--src/mainboard/intel/d510mo/Makefile.inc2
-rw-r--r--src/mainboard/intel/d945gclf/Makefile.inc2
-rw-r--r--src/mainboard/intel/dcp847ske/Makefile.inc2
-rw-r--r--src/mainboard/intel/dg41wv/Makefile.inc2
-rw-r--r--src/mainboard/intel/dq67sw/Makefile.inc2
-rw-r--r--src/mainboard/intel/glkrvp/Makefile.inc2
-rw-r--r--src/mainboard/intel/glkrvp/variants/baseboard/Makefile.inc2
-rw-r--r--src/mainboard/intel/leafhill/Makefile.inc2
-rw-r--r--src/mainboard/intel/minnow3/Makefile.inc2
-rw-r--r--src/mainboard/inventec/transformers/Makefile.inc2
-rw-r--r--src/mainboard/kontron/986lcd-m/Makefile.inc2
-rw-r--r--src/mainboard/kontron/ktqm77/Makefile.inc2
-rw-r--r--src/mainboard/kontron/mal10/Makefile.inc2
-rw-r--r--src/mainboard/kontron/mal10/carriers/t10-tni/Makefile.inc2
-rw-r--r--src/mainboard/kontron/mal10/variants/mal10/Makefile.inc2
-rw-r--r--src/mainboard/lenovo/haswell/Makefile.inc2
-rw-r--r--src/mainboard/lenovo/haswell/variants/t440p/Makefile.inc2
-rw-r--r--src/mainboard/lenovo/s230u/Makefile.inc2
-rw-r--r--src/mainboard/lenovo/t430/Makefile.inc2
-rw-r--r--src/mainboard/lenovo/thinkcentre_a58/Makefile.inc2
-rw-r--r--src/mainboard/msi/h81m-p33/Makefile.inc2
-rw-r--r--src/mainboard/msi/ms7707/Makefile.inc2
-rw-r--r--src/mainboard/siemens/mc_apl1/Makefile.inc2
-rw-r--r--src/mainboard/siemens/mc_apl1/variants/baseboard/Makefile.inc1
-rw-r--r--src/mainboard/siemens/mc_apl1/variants/mc_apl1/Makefile.inc2
-rw-r--r--src/mainboard/siemens/mc_apl1/variants/mc_apl2/Makefile.inc2
-rw-r--r--src/mainboard/siemens/mc_apl1/variants/mc_apl3/Makefile.inc2
-rw-r--r--src/mainboard/siemens/mc_apl1/variants/mc_apl4/Makefile.inc2
-rw-r--r--src/mainboard/siemens/mc_apl1/variants/mc_apl5/Makefile.inc2
-rw-r--r--src/mainboard/siemens/mc_apl1/variants/mc_apl6/Makefile.inc2
-rw-r--r--src/mainboard/siemens/mc_apl1/variants/mc_apl7/Makefile.inc2
-rw-r--r--src/mainboard/supermicro/x9scl/Makefile.inc2
-rw-r--r--src/mainboard/system76/addw1/Makefile.inc2
-rw-r--r--src/mainboard/system76/adl/Makefile.inc2
-rw-r--r--src/mainboard/system76/bonw14/Makefile.inc2
-rw-r--r--src/mainboard/system76/cml-u/Makefile.inc2
-rw-r--r--src/mainboard/system76/gaze15/Makefile.inc2
-rw-r--r--src/mainboard/system76/kbl-u/Makefile.inc2
-rw-r--r--src/mainboard/system76/oryp5/Makefile.inc2
-rw-r--r--src/mainboard/system76/oryp6/Makefile.inc2
-rw-r--r--src/mainboard/system76/tgl-u/Makefile.inc2
-rw-r--r--src/mainboard/system76/whl-u/Makefile.inc2
-rw-r--r--src/mainboard/up/squared/Makefile.inc2
142 files changed, 275 insertions, 0 deletions
diff --git a/src/mainboard/apple/macbook21/Makefile.inc b/src/mainboard/apple/macbook21/Makefile.inc
index 58198971cdee..115d7e9cbd93 100644
--- a/src/mainboard/apple/macbook21/Makefile.inc
+++ b/src/mainboard/apple/macbook21/Makefile.inc
@@ -1,3 +1,5 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
romstage-y += gpio.c
bootblock-y += early_init.c
romstage-y += early_init.c
diff --git a/src/mainboard/apple/macbookair4_2/Makefile.inc b/src/mainboard/apple/macbookair4_2/Makefile.inc
index 665a95f1955d..36e42581cf58 100644
--- a/src/mainboard/apple/macbookair4_2/Makefile.inc
+++ b/src/mainboard/apple/macbookair4_2/Makefile.inc
@@ -1,3 +1,5 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
bootblock-y += gpio.c
romstage-y += gpio.c
ramstage-y += gnvs.c
diff --git a/src/mainboard/asrock/b85m_pro4/Makefile.inc b/src/mainboard/asrock/b85m_pro4/Makefile.inc
index d9a8d18d0de0..54643607ce06 100644
--- a/src/mainboard/asrock/b85m_pro4/Makefile.inc
+++ b/src/mainboard/asrock/b85m_pro4/Makefile.inc
@@ -1,3 +1,5 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
romstage-y += gpio.c
ramstage-$(CONFIG_MAINBOARD_USE_LIBGFXINIT) += gma-mainboard.ads
diff --git a/src/mainboard/asrock/g41c-gs/Makefile.inc b/src/mainboard/asrock/g41c-gs/Makefile.inc
index ab352cb73db1..bb906a65a084 100644
--- a/src/mainboard/asrock/g41c-gs/Makefile.inc
+++ b/src/mainboard/asrock/g41c-gs/Makefile.inc
@@ -1,3 +1,5 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
ramstage-y += cstates.c
romstage-y += variants/$(VARIANT_DIR)/gpio.c
diff --git a/src/mainboard/asus/p2b/Makefile.inc b/src/mainboard/asus/p2b/Makefile.inc
index eb48944b6ef2..6e1fb3fef1a2 100644
--- a/src/mainboard/asus/p2b/Makefile.inc
+++ b/src/mainboard/asus/p2b/Makefile.inc
@@ -1,3 +1,5 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
bootblock-y += bootblock.c
romstage-$(CONFIG_BOARD_ASUS_P3B_F) += variants/$(VARIANT_DIR)/romstage.c
diff --git a/src/mainboard/asus/p5gc-mx/Makefile.inc b/src/mainboard/asus/p5gc-mx/Makefile.inc
index a34f3f31c78e..95250e28a6b3 100644
--- a/src/mainboard/asus/p5gc-mx/Makefile.inc
+++ b/src/mainboard/asus/p5gc-mx/Makefile.inc
@@ -1,3 +1,5 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
ramstage-y += cstates.c
romstage-y += gpio.c
bootblock-y += early_init.c
diff --git a/src/mainboard/asus/p5qpl-am/Makefile.inc b/src/mainboard/asus/p5qpl-am/Makefile.inc
index ab352cb73db1..bb906a65a084 100644
--- a/src/mainboard/asus/p5qpl-am/Makefile.inc
+++ b/src/mainboard/asus/p5qpl-am/Makefile.inc
@@ -1,3 +1,5 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
ramstage-y += cstates.c
romstage-y += variants/$(VARIANT_DIR)/gpio.c
diff --git a/src/mainboard/biostar/th61-itx/Makefile.inc b/src/mainboard/biostar/th61-itx/Makefile.inc
index 549a84fd128f..33b55d2d4ff0 100644
--- a/src/mainboard/biostar/th61-itx/Makefile.inc
+++ b/src/mainboard/biostar/th61-itx/Makefile.inc
@@ -1,3 +1,5 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
bootblock-y += gpio.c
romstage-y += gpio.c
diff --git a/src/mainboard/bytedance/bd_egs/Makefile.inc b/src/mainboard/bytedance/bd_egs/Makefile.inc
index e6e739e4e1e0..be3ae0c8a292 100644
--- a/src/mainboard/bytedance/bd_egs/Makefile.inc
+++ b/src/mainboard/bytedance/bd_egs/Makefile.inc
@@ -1,3 +1,5 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
bootblock-y += bootblock.c gpio.c
romstage-y += romstage.c
ramstage-y += ramstage.c gpio.c
diff --git a/src/mainboard/clevo/cml-u/Makefile.inc b/src/mainboard/clevo/cml-u/Makefile.inc
index e71e87a07d07..babadf538a3a 100644
--- a/src/mainboard/clevo/cml-u/Makefile.inc
+++ b/src/mainboard/clevo/cml-u/Makefile.inc
@@ -1,3 +1,5 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
CPPFLAGS_common += -I$(src)/mainboard/$(MAINBOARDDIR)/include
CPPFLAGS_common += -I$(src)/mainboard/$(MAINBOARDDIR)/variants/$(VARIANT_DIR)/acpi
diff --git a/src/mainboard/clevo/cml-u/variants/l140cu/Makefile.inc b/src/mainboard/clevo/cml-u/variants/l140cu/Makefile.inc
index 09089b43adaf..7f547fb03a5b 100644
--- a/src/mainboard/clevo/cml-u/variants/l140cu/Makefile.inc
+++ b/src/mainboard/clevo/cml-u/variants/l140cu/Makefile.inc
@@ -1 +1,3 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
SPD_SOURCES = samsung-K4AAG165WA-BCTD
diff --git a/src/mainboard/clevo/tgl-u/Makefile.inc b/src/mainboard/clevo/tgl-u/Makefile.inc
index 0d57383595a7..ae492df4298d 100644
--- a/src/mainboard/clevo/tgl-u/Makefile.inc
+++ b/src/mainboard/clevo/tgl-u/Makefile.inc
@@ -1,3 +1,5 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
CPPFLAGS_common += -I$(src)/mainboard/$(MAINBOARDDIR)/include
CPPFLAGS_common += -I$(src)/mainboard/$(MAINBOARDDIR)/variants/$(VARIANT_DIR)/acpi
diff --git a/src/mainboard/clevo/tgl-u/variants/l140mu/Makefile.inc b/src/mainboard/clevo/tgl-u/variants/l140mu/Makefile.inc
index 10cb4fb8af40..361cbcd7bc9d 100644
--- a/src/mainboard/clevo/tgl-u/variants/l140mu/Makefile.inc
+++ b/src/mainboard/clevo/tgl-u/variants/l140mu/Makefile.inc
@@ -1 +1,3 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
SPD_SOURCES = samsung-M471A1G44AB0-CWE
diff --git a/src/mainboard/compulab/intense_pc/Makefile.inc b/src/mainboard/compulab/intense_pc/Makefile.inc
index e402ffa605ce..e4b6fbf0f0a5 100644
--- a/src/mainboard/compulab/intense_pc/Makefile.inc
+++ b/src/mainboard/compulab/intense_pc/Makefile.inc
@@ -1,3 +1,5 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
bootblock-y += gpio.c
romstage-y += gpio.c
diff --git a/src/mainboard/emulation/qemu-i440fx/Makefile.inc b/src/mainboard/emulation/qemu-i440fx/Makefile.inc
index 7bd1c0212149..7d6041b62d5c 100644
--- a/src/mainboard/emulation/qemu-i440fx/Makefile.inc
+++ b/src/mainboard/emulation/qemu-i440fx/Makefile.inc
@@ -1,3 +1,5 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
romstage-y += memmap.c
postcar-y += memmap.c
diff --git a/src/mainboard/emulation/qemu-q35/Makefile.inc b/src/mainboard/emulation/qemu-q35/Makefile.inc
index dc4e79436882..f4a89be06f7f 100644
--- a/src/mainboard/emulation/qemu-q35/Makefile.inc
+++ b/src/mainboard/emulation/qemu-q35/Makefile.inc
@@ -1,3 +1,5 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
bootblock-y += bootblock.c
bootblock-y += memmap.c
diff --git a/src/mainboard/foxconn/d41s/Makefile.inc b/src/mainboard/foxconn/d41s/Makefile.inc
index 057b5bfcd337..6e0b91475cd5 100644
--- a/src/mainboard/foxconn/d41s/Makefile.inc
+++ b/src/mainboard/foxconn/d41s/Makefile.inc
@@ -1,3 +1,5 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
romstage-y += early_init.c
bootblock-y += early_init.c
ramstage-y += cstates.c
diff --git a/src/mainboard/foxconn/g41s-k/Makefile.inc b/src/mainboard/foxconn/g41s-k/Makefile.inc
index 161c623eaaa1..b4e5dcc3d794 100644
--- a/src/mainboard/foxconn/g41s-k/Makefile.inc
+++ b/src/mainboard/foxconn/g41s-k/Makefile.inc
@@ -1,3 +1,5 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
ramstage-y += cstates.c
romstage-y += gpio.c
diff --git a/src/mainboard/gigabyte/ga-945gcm-s2l/Makefile.inc b/src/mainboard/gigabyte/ga-945gcm-s2l/Makefile.inc
index a34f3f31c78e..95250e28a6b3 100644
--- a/src/mainboard/gigabyte/ga-945gcm-s2l/Makefile.inc
+++ b/src/mainboard/gigabyte/ga-945gcm-s2l/Makefile.inc
@@ -1,3 +1,5 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
ramstage-y += cstates.c
romstage-y += gpio.c
bootblock-y += early_init.c
diff --git a/src/mainboard/gigabyte/ga-g41m-es2l/Makefile.inc b/src/mainboard/gigabyte/ga-g41m-es2l/Makefile.inc
index 4100476891a2..de8c51494dc2 100644
--- a/src/mainboard/gigabyte/ga-g41m-es2l/Makefile.inc
+++ b/src/mainboard/gigabyte/ga-g41m-es2l/Makefile.inc
@@ -1,3 +1,5 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
ramstage-y += cstates.c
romstage-y += gpio.c
diff --git a/src/mainboard/gigabyte/ga-h61m-series/Makefile.inc b/src/mainboard/gigabyte/ga-h61m-series/Makefile.inc
index 9916927d252b..6b13e84fbcc4 100644
--- a/src/mainboard/gigabyte/ga-h61m-series/Makefile.inc
+++ b/src/mainboard/gigabyte/ga-h61m-series/Makefile.inc
@@ -1,3 +1,5 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
bootblock-y += variants/$(VARIANT_DIR)/gpio.c
romstage-y += variants/$(VARIANT_DIR)/gpio.c
diff --git a/src/mainboard/google/asurada/Makefile.inc b/src/mainboard/google/asurada/Makefile.inc
index 84600b69cae2..63073bcbf7cb 100644
--- a/src/mainboard/google/asurada/Makefile.inc
+++ b/src/mainboard/google/asurada/Makefile.inc
@@ -1,3 +1,5 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
subdirs-y += sdram_params/
bootblock-y += memlayout.ld
diff --git a/src/mainboard/google/asurada/sdram_params/Makefile.inc b/src/mainboard/google/asurada/sdram_params/Makefile.inc
index 20df2ba6cbdc..2ce244252acc 100644
--- a/src/mainboard/google/asurada/sdram_params/Makefile.inc
+++ b/src/mainboard/google/asurada/sdram_params/Makefile.inc
@@ -1,3 +1,5 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
sdram-params :=
# Generic parameters
diff --git a/src/mainboard/google/brya/Makefile.inc b/src/mainboard/google/brya/Makefile.inc
index b98c3ee87c27..8c7e42d5f7ea 100644
--- a/src/mainboard/google/brya/Makefile.inc
+++ b/src/mainboard/google/brya/Makefile.inc
@@ -1,3 +1,5 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
bootblock-y += bootblock.c
verstage-$(CONFIG_CHROMEOS) += chromeos.c
diff --git a/src/mainboard/google/brya/variants/aurash/Makefile.inc b/src/mainboard/google/brya/variants/aurash/Makefile.inc
index b799b4d7b85d..35cff38dc823 100644
--- a/src/mainboard/google/brya/variants/aurash/Makefile.inc
+++ b/src/mainboard/google/brya/variants/aurash/Makefile.inc
@@ -1,3 +1,5 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
bootblock-y += gpio.c
romstage-y += gpio.c
diff --git a/src/mainboard/google/brya/variants/baseboard/brask/Makefile.inc b/src/mainboard/google/brya/variants/baseboard/brask/Makefile.inc
index 8121d7e3ae71..96950d7b7d3f 100644
--- a/src/mainboard/google/brya/variants/baseboard/brask/Makefile.inc
+++ b/src/mainboard/google/brya/variants/baseboard/brask/Makefile.inc
@@ -1,3 +1,5 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
bootblock-y += gpio.c
romstage-y += memory.c
diff --git a/src/mainboard/google/brya/variants/baseboard/brya/Makefile.inc b/src/mainboard/google/brya/variants/baseboard/brya/Makefile.inc
index f2efc1de3055..3a6695828f71 100644
--- a/src/mainboard/google/brya/variants/baseboard/brya/Makefile.inc
+++ b/src/mainboard/google/brya/variants/baseboard/brya/Makefile.inc
@@ -1,3 +1,5 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
bootblock-y += gpio.c
romstage-y += memory.c
diff --git a/src/mainboard/google/brya/variants/baseboard/hades/Makefile.inc b/src/mainboard/google/brya/variants/baseboard/hades/Makefile.inc
index 7c75e20e41e0..47123cd318ad 100644
--- a/src/mainboard/google/brya/variants/baseboard/hades/Makefile.inc
+++ b/src/mainboard/google/brya/variants/baseboard/hades/Makefile.inc
@@ -1,2 +1,4 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
romstage-y += memory.c
ramstage-y += ramstage.c
diff --git a/src/mainboard/google/brya/variants/baseboard/nissa/Makefile.inc b/src/mainboard/google/brya/variants/baseboard/nissa/Makefile.inc
index 53aaa4114886..3743228e8e8b 100644
--- a/src/mainboard/google/brya/variants/baseboard/nissa/Makefile.inc
+++ b/src/mainboard/google/brya/variants/baseboard/nissa/Makefile.inc
@@ -1,3 +1,5 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
bootblock-y += gpio.c
romstage-y += memory.c
diff --git a/src/mainboard/google/brya/variants/brya0/Makefile.inc b/src/mainboard/google/brya/variants/brya0/Makefile.inc
index 52d03980daf0..4a7ff71e4566 100644
--- a/src/mainboard/google/brya/variants/brya0/Makefile.inc
+++ b/src/mainboard/google/brya/variants/brya0/Makefile.inc
@@ -1,3 +1,5 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
bootblock-y += gpio.c
romstage-y += gpio.c
ramstage-$(CONFIG_FW_CONFIG) += fw_config.c
diff --git a/src/mainboard/google/brya/variants/crota/Makefile.inc b/src/mainboard/google/brya/variants/crota/Makefile.inc
index f9d5990acec0..ebdc2e38e26a 100644
--- a/src/mainboard/google/brya/variants/crota/Makefile.inc
+++ b/src/mainboard/google/brya/variants/crota/Makefile.inc
@@ -1,3 +1,5 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
bootblock-y += gpio.c
romstage-y += gpio.c
diff --git a/src/mainboard/google/brya/variants/gaelin/Makefile.inc b/src/mainboard/google/brya/variants/gaelin/Makefile.inc
index 7d1f88652da7..2cddd114addc 100644
--- a/src/mainboard/google/brya/variants/gaelin/Makefile.inc
+++ b/src/mainboard/google/brya/variants/gaelin/Makefile.inc
@@ -1,3 +1,5 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
bootblock-y += gpio.c
romstage-y += gpio.c
diff --git a/src/mainboard/google/brya/variants/gothrax/Makefile.inc b/src/mainboard/google/brya/variants/gothrax/Makefile.inc
index 6c2934647040..a49954cc3513 100644
--- a/src/mainboard/google/brya/variants/gothrax/Makefile.inc
+++ b/src/mainboard/google/brya/variants/gothrax/Makefile.inc
@@ -1,3 +1,5 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
bootblock-y += gpio.c
romstage-y += gpio.c
diff --git a/src/mainboard/google/brya/variants/hades/Makefile.inc b/src/mainboard/google/brya/variants/hades/Makefile.inc
index 81d298a70823..e272dc2d765f 100644
--- a/src/mainboard/google/brya/variants/hades/Makefile.inc
+++ b/src/mainboard/google/brya/variants/hades/Makefile.inc
@@ -1,3 +1,5 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
bootblock-y += gpio.c
romstage-y += gpio.c
ramstage-y += gpio.c
diff --git a/src/mainboard/google/brya/variants/moli/Makefile.inc b/src/mainboard/google/brya/variants/moli/Makefile.inc
index b799b4d7b85d..35cff38dc823 100644
--- a/src/mainboard/google/brya/variants/moli/Makefile.inc
+++ b/src/mainboard/google/brya/variants/moli/Makefile.inc
@@ -1,3 +1,5 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
bootblock-y += gpio.c
romstage-y += gpio.c
diff --git a/src/mainboard/google/brya/variants/skolas/Makefile.inc b/src/mainboard/google/brya/variants/skolas/Makefile.inc
index 52d03980daf0..4a7ff71e4566 100644
--- a/src/mainboard/google/brya/variants/skolas/Makefile.inc
+++ b/src/mainboard/google/brya/variants/skolas/Makefile.inc
@@ -1,3 +1,5 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
bootblock-y += gpio.c
romstage-y += gpio.c
ramstage-$(CONFIG_FW_CONFIG) += fw_config.c
diff --git a/src/mainboard/google/brya/variants/skolas4es/Makefile.inc b/src/mainboard/google/brya/variants/skolas4es/Makefile.inc
index 52d03980daf0..4a7ff71e4566 100644
--- a/src/mainboard/google/brya/variants/skolas4es/Makefile.inc
+++ b/src/mainboard/google/brya/variants/skolas4es/Makefile.inc
@@ -1,3 +1,5 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
bootblock-y += gpio.c
romstage-y += gpio.c
ramstage-$(CONFIG_FW_CONFIG) += fw_config.c
diff --git a/src/mainboard/google/brya/variants/taeko/Makefile.inc b/src/mainboard/google/brya/variants/taeko/Makefile.inc
index 396e5be222c9..47f0432aeb12 100644
--- a/src/mainboard/google/brya/variants/taeko/Makefile.inc
+++ b/src/mainboard/google/brya/variants/taeko/Makefile.inc
@@ -1,3 +1,5 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
bootblock-y += gpio.c
romstage-y += gpio.c
diff --git a/src/mainboard/google/brya/variants/taeko4es/Makefile.inc b/src/mainboard/google/brya/variants/taeko4es/Makefile.inc
index 396e5be222c9..47f0432aeb12 100644
--- a/src/mainboard/google/brya/variants/taeko4es/Makefile.inc
+++ b/src/mainboard/google/brya/variants/taeko4es/Makefile.inc
@@ -1,3 +1,5 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
bootblock-y += gpio.c
romstage-y += gpio.c
diff --git a/src/mainboard/google/brya/variants/taniks/Makefile.inc b/src/mainboard/google/brya/variants/taniks/Makefile.inc
index 3ee0dc9e0dc8..61a70ec0ef6f 100644
--- a/src/mainboard/google/brya/variants/taniks/Makefile.inc
+++ b/src/mainboard/google/brya/variants/taniks/Makefile.inc
@@ -1,3 +1,5 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
bootblock-y += gpio.c
romstage-y += gpio.c
diff --git a/src/mainboard/google/cherry/Makefile.inc b/src/mainboard/google/cherry/Makefile.inc
index 4edbd38799f3..5fe133919cd8 100644
--- a/src/mainboard/google/cherry/Makefile.inc
+++ b/src/mainboard/google/cherry/Makefile.inc
@@ -1,3 +1,5 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
bootblock-y += memlayout.ld
bootblock-y += bootblock.c
bootblock-y += chromeos.c
diff --git a/src/mainboard/google/corsola/Makefile.inc b/src/mainboard/google/corsola/Makefile.inc
index da6775af2ee2..dce226f20cfe 100644
--- a/src/mainboard/google/corsola/Makefile.inc
+++ b/src/mainboard/google/corsola/Makefile.inc
@@ -1,3 +1,5 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
bootblock-y += memlayout.ld
bootblock-y += bootblock.c
bootblock-y += chromeos.c
diff --git a/src/mainboard/google/dedede/Makefile.inc b/src/mainboard/google/dedede/Makefile.inc
index ec1c065107b6..fdc26306bbc9 100644
--- a/src/mainboard/google/dedede/Makefile.inc
+++ b/src/mainboard/google/dedede/Makefile.inc
@@ -1,3 +1,5 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
bootblock-y += bootblock.c
bootblock-$(CONFIG_CHROMEOS) += chromeos.c
diff --git a/src/mainboard/google/dedede/variants/baseboard/Makefile.inc b/src/mainboard/google/dedede/variants/baseboard/Makefile.inc
index 2c3f2f698916..a58371afe952 100644
--- a/src/mainboard/google/dedede/variants/baseboard/Makefile.inc
+++ b/src/mainboard/google/dedede/variants/baseboard/Makefile.inc
@@ -1,3 +1,5 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
bootblock-y += gpio.c
romstage-y += gpio.c
diff --git a/src/mainboard/google/fizz/variants/baseboard/Makefile.inc b/src/mainboard/google/fizz/variants/baseboard/Makefile.inc
index 0ad298b5f46e..476f28f18ce3 100644
--- a/src/mainboard/google/fizz/variants/baseboard/Makefile.inc
+++ b/src/mainboard/google/fizz/variants/baseboard/Makefile.inc
@@ -1,3 +1,5 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
bootblock-y += gpio.c
ramstage-y += gpio.c
diff --git a/src/mainboard/google/fizz/variants/endeavour/Makefile.inc b/src/mainboard/google/fizz/variants/endeavour/Makefile.inc
index ded8a3572a2d..6ff6456dd03c 100644
--- a/src/mainboard/google/fizz/variants/endeavour/Makefile.inc
+++ b/src/mainboard/google/fizz/variants/endeavour/Makefile.inc
@@ -1,3 +1,5 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
bootblock-y += gpio.c
ramstage-y += gpio.c
diff --git a/src/mainboard/google/fizz/variants/karma/Makefile.inc b/src/mainboard/google/fizz/variants/karma/Makefile.inc
index ec115e465571..8d74101bb856 100644
--- a/src/mainboard/google/fizz/variants/karma/Makefile.inc
+++ b/src/mainboard/google/fizz/variants/karma/Makefile.inc
@@ -1,3 +1,5 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
bootblock-y += gpio.c
ramstage-y += gpio.c
diff --git a/src/mainboard/google/geralt/Makefile.inc b/src/mainboard/google/geralt/Makefile.inc
index d2fda23b875a..9a3549650243 100644
--- a/src/mainboard/google/geralt/Makefile.inc
+++ b/src/mainboard/google/geralt/Makefile.inc
@@ -1,3 +1,5 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
bootblock-y += memlayout.ld
bootblock-y += bootblock.c
bootblock-y += chromeos.c
diff --git a/src/mainboard/google/guybrush/variants/baseboard/Makefile.inc b/src/mainboard/google/guybrush/variants/baseboard/Makefile.inc
index cfd3faa6a64b..74d030dd74f7 100644
--- a/src/mainboard/google/guybrush/variants/baseboard/Makefile.inc
+++ b/src/mainboard/google/guybrush/variants/baseboard/Makefile.inc
@@ -1,3 +1,5 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
bootblock-y += gpio.c
bootblock-y += helpers.c
diff --git a/src/mainboard/google/kukui/Makefile.inc b/src/mainboard/google/kukui/Makefile.inc
index 968ee19627d6..7b0298d61eda 100644
--- a/src/mainboard/google/kukui/Makefile.inc
+++ b/src/mainboard/google/kukui/Makefile.inc
@@ -1,3 +1,5 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
subdirs-y += sdram_params/
subdirs-y += panel_params/
diff --git a/src/mainboard/google/kukui/sdram_params/Makefile.inc b/src/mainboard/google/kukui/sdram_params/Makefile.inc
index cb8f427413c7..e7fc110973d4 100644
--- a/src/mainboard/google/kukui/sdram_params/Makefile.inc
+++ b/src/mainboard/google/kukui/sdram_params/Makefile.inc
@@ -1,3 +1,5 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
sdram-params :=
sdram-params += sdram-lpddr4x-K4UBE3D4AA-MGCR-4GB
sdram-params += sdram-lpddr4x-H9HCNNNCPMALHR-4GB
diff --git a/src/mainboard/google/mistral/Makefile.inc b/src/mainboard/google/mistral/Makefile.inc
index 48faadf2e830..1cbaa8b3fac9 100644
--- a/src/mainboard/google/mistral/Makefile.inc
+++ b/src/mainboard/google/mistral/Makefile.inc
@@ -1,3 +1,4 @@
+## SPDX-License-Identifier: GPL-2.0-only
bootblock-y += chromeos.c
bootblock-y += reset.c
diff --git a/src/mainboard/google/myst/variants/baseboard/Makefile.inc b/src/mainboard/google/myst/variants/baseboard/Makefile.inc
index 9e9ec0dc53d2..d5e133a9ec72 100644
--- a/src/mainboard/google/myst/variants/baseboard/Makefile.inc
+++ b/src/mainboard/google/myst/variants/baseboard/Makefile.inc
@@ -1,3 +1,5 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
bootblock-y += gpio.c
ramstage-$(CONFIG_FW_CONFIG) += fw_config.c
diff --git a/src/mainboard/google/octopus/Makefile.inc b/src/mainboard/google/octopus/Makefile.inc
index dd49610f89cc..accb4633f37c 100644
--- a/src/mainboard/google/octopus/Makefile.inc
+++ b/src/mainboard/google/octopus/Makefile.inc
@@ -1,3 +1,5 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
bootblock-y += bootblock.c
bootblock-y += ec.c
diff --git a/src/mainboard/google/octopus/variants/ampton/Makefile.inc b/src/mainboard/google/octopus/variants/ampton/Makefile.inc
index dc1c1fe1eb4f..c717243faea9 100644
--- a/src/mainboard/google/octopus/variants/ampton/Makefile.inc
+++ b/src/mainboard/google/octopus/variants/ampton/Makefile.inc
@@ -1,3 +1,5 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
bootblock-y += gpio.c
romstage-y += gpio.c
diff --git a/src/mainboard/google/octopus/variants/baseboard/Makefile.inc b/src/mainboard/google/octopus/variants/baseboard/Makefile.inc
index 06f125c862a2..ace6dee6303b 100644
--- a/src/mainboard/google/octopus/variants/baseboard/Makefile.inc
+++ b/src/mainboard/google/octopus/variants/baseboard/Makefile.inc
@@ -1,3 +1,5 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
bootblock-y += gpio.c
romstage-y += memory.c
diff --git a/src/mainboard/google/octopus/variants/bloog/Makefile.inc b/src/mainboard/google/octopus/variants/bloog/Makefile.inc
index 5228e706f14e..86a53c078ef6 100644
--- a/src/mainboard/google/octopus/variants/bloog/Makefile.inc
+++ b/src/mainboard/google/octopus/variants/bloog/Makefile.inc
@@ -1,3 +1,5 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
bootblock-y += gpio.c
romstage-y += gpio.c
diff --git a/src/mainboard/google/octopus/variants/bobba/Makefile.inc b/src/mainboard/google/octopus/variants/bobba/Makefile.inc
index a854b669d3b0..17f22e52aaba 100644
--- a/src/mainboard/google/octopus/variants/bobba/Makefile.inc
+++ b/src/mainboard/google/octopus/variants/bobba/Makefile.inc
@@ -1,3 +1,5 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
bootblock-y += gpio.c
romstage-y += gpio.c
diff --git a/src/mainboard/google/octopus/variants/casta/Makefile.inc b/src/mainboard/google/octopus/variants/casta/Makefile.inc
index ba865e9f826a..3c26f0ae6879 100644
--- a/src/mainboard/google/octopus/variants/casta/Makefile.inc
+++ b/src/mainboard/google/octopus/variants/casta/Makefile.inc
@@ -1,3 +1,5 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
bootblock-y += gpio.c
ramstage-y += gpio.c
diff --git a/src/mainboard/google/octopus/variants/dood/Makefile.inc b/src/mainboard/google/octopus/variants/dood/Makefile.inc
index a854b669d3b0..17f22e52aaba 100644
--- a/src/mainboard/google/octopus/variants/dood/Makefile.inc
+++ b/src/mainboard/google/octopus/variants/dood/Makefile.inc
@@ -1,3 +1,5 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
bootblock-y += gpio.c
romstage-y += gpio.c
diff --git a/src/mainboard/google/octopus/variants/fleex/Makefile.inc b/src/mainboard/google/octopus/variants/fleex/Makefile.inc
index 9a649bda6a34..ac62f6b7bae1 100644
--- a/src/mainboard/google/octopus/variants/fleex/Makefile.inc
+++ b/src/mainboard/google/octopus/variants/fleex/Makefile.inc
@@ -1,3 +1,5 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
bootblock-y += gpio.c
romstage-y += gpio.c
diff --git a/src/mainboard/google/octopus/variants/foob/Makefile.inc b/src/mainboard/google/octopus/variants/foob/Makefile.inc
index 86a10df2a08f..a2f85b09f615 100644
--- a/src/mainboard/google/octopus/variants/foob/Makefile.inc
+++ b/src/mainboard/google/octopus/variants/foob/Makefile.inc
@@ -1,3 +1,5 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
bootblock-y += gpio.c
romstage-y += gpio.c
ramstage-y += gpio.c
diff --git a/src/mainboard/google/octopus/variants/garg/Makefile.inc b/src/mainboard/google/octopus/variants/garg/Makefile.inc
index 16211b7eaba6..6d41a6d35cd1 100644
--- a/src/mainboard/google/octopus/variants/garg/Makefile.inc
+++ b/src/mainboard/google/octopus/variants/garg/Makefile.inc
@@ -1,3 +1,5 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
bootblock-y += gpio.c
romstage-y += gpio.c
diff --git a/src/mainboard/google/octopus/variants/lick/Makefile.inc b/src/mainboard/google/octopus/variants/lick/Makefile.inc
index 9fb63f5f433b..9f8b7815b535 100644
--- a/src/mainboard/google/octopus/variants/lick/Makefile.inc
+++ b/src/mainboard/google/octopus/variants/lick/Makefile.inc
@@ -1,3 +1,5 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
bootblock-y += gpio.c
ramstage-y += gpio.c
diff --git a/src/mainboard/google/octopus/variants/meep/Makefile.inc b/src/mainboard/google/octopus/variants/meep/Makefile.inc
index 7277888358a0..4526e12ac6d0 100644
--- a/src/mainboard/google/octopus/variants/meep/Makefile.inc
+++ b/src/mainboard/google/octopus/variants/meep/Makefile.inc
@@ -1,3 +1,5 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
bootblock-y += gpio.c
romstage-y += gpio.c
diff --git a/src/mainboard/google/octopus/variants/phaser/Makefile.inc b/src/mainboard/google/octopus/variants/phaser/Makefile.inc
index 1b171c5e31c8..eda39ac58d73 100644
--- a/src/mainboard/google/octopus/variants/phaser/Makefile.inc
+++ b/src/mainboard/google/octopus/variants/phaser/Makefile.inc
@@ -1,3 +1,5 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
bootblock-y += gpio.c
romstage-y += gpio.c
diff --git a/src/mainboard/google/octopus/variants/yorp/Makefile.inc b/src/mainboard/google/octopus/variants/yorp/Makefile.inc
index 0ec849f5b563..f1a61afdcc4a 100644
--- a/src/mainboard/google/octopus/variants/yorp/Makefile.inc
+++ b/src/mainboard/google/octopus/variants/yorp/Makefile.inc
@@ -1,2 +1,4 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
bootblock-y += gpio.c
romstage-y += gpio.c
diff --git a/src/mainboard/google/poppy/spd/Makefile.inc b/src/mainboard/google/poppy/spd/Makefile.inc
index 997352cd0cec..83fbfc5cc649 100644
--- a/src/mainboard/google/poppy/spd/Makefile.inc
+++ b/src/mainboard/google/poppy/spd/Makefile.inc
@@ -1,3 +1,4 @@
+## SPDX-License-Identifier: GPL-2.0-only
SEC_SPD_BIN = $(obj)/sec-spd.bin
diff --git a/src/mainboard/google/poppy/variants/atlas/Makefile.inc b/src/mainboard/google/poppy/variants/atlas/Makefile.inc
index 397ef687e910..dc9062ced6b1 100644
--- a/src/mainboard/google/poppy/variants/atlas/Makefile.inc
+++ b/src/mainboard/google/poppy/variants/atlas/Makefile.inc
@@ -1,3 +1,4 @@
+## SPDX-License-Identifier: GPL-2.0-only
SPD_SOURCES = empty # 0b0000
SPD_SOURCES += samsung_dimm_K4E8E324EB-EGCF # 0b0001
diff --git a/src/mainboard/google/poppy/variants/baseboard/Makefile.inc b/src/mainboard/google/poppy/variants/baseboard/Makefile.inc
index 41669f2114f2..0d70ca23ddf5 100644
--- a/src/mainboard/google/poppy/variants/baseboard/Makefile.inc
+++ b/src/mainboard/google/poppy/variants/baseboard/Makefile.inc
@@ -1,3 +1,5 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
bootblock-y += gpio.c
romstage-y += memory.c
diff --git a/src/mainboard/google/poppy/variants/nami/Makefile.inc b/src/mainboard/google/poppy/variants/nami/Makefile.inc
index 7c1e4808a6dc..7d9e81edc2b1 100644
--- a/src/mainboard/google/poppy/variants/nami/Makefile.inc
+++ b/src/mainboard/google/poppy/variants/nami/Makefile.inc
@@ -1,3 +1,4 @@
+## SPDX-License-Identifier: GPL-2.0-only
# IMPORTANT!! When a new memory SPD is added here, please ensure that ddp_bitmap
# is correctly updated in memory.c to indicate if memory id is using DDP.
diff --git a/src/mainboard/google/poppy/variants/nautilus/Makefile.inc b/src/mainboard/google/poppy/variants/nautilus/Makefile.inc
index 3a36b83bdade..80e43fd6a247 100644
--- a/src/mainboard/google/poppy/variants/nautilus/Makefile.inc
+++ b/src/mainboard/google/poppy/variants/nautilus/Makefile.inc
@@ -1,3 +1,4 @@
+## SPDX-License-Identifier: GPL-2.0-only
SPD_SOURCES = samsung_dimm_K4E8E324EB-EGCF # 0b0000
SPD_SOURCES += samsung_dimm_K4E6E304EB-EGCF # 0b0001
diff --git a/src/mainboard/google/poppy/variants/nocturne/Makefile.inc b/src/mainboard/google/poppy/variants/nocturne/Makefile.inc
index 371655a94e37..f5544f6f6ac8 100644
--- a/src/mainboard/google/poppy/variants/nocturne/Makefile.inc
+++ b/src/mainboard/google/poppy/variants/nocturne/Makefile.inc
@@ -1,3 +1,4 @@
+## SPDX-License-Identifier: GPL-2.0-only
SPD_SOURCES = empty # 0b0000
SPD_SOURCES += samsung_dimm_K4E8E324EB-EGCF # 0b0001 4GB
diff --git a/src/mainboard/google/poppy/variants/poppy/Makefile.inc b/src/mainboard/google/poppy/variants/poppy/Makefile.inc
index ecd1451ea2a3..15d803a8c0c2 100644
--- a/src/mainboard/google/poppy/variants/poppy/Makefile.inc
+++ b/src/mainboard/google/poppy/variants/poppy/Makefile.inc
@@ -1,3 +1,4 @@
+## SPDX-License-Identifier: GPL-2.0-only
SPD_SOURCES = empty # 0b0000
SPD_SOURCES += micron_dimm_MT52L256M64D2PP-107 # 0b0001
diff --git a/src/mainboard/google/poppy/variants/rammus/Makefile.inc b/src/mainboard/google/poppy/variants/rammus/Makefile.inc
index 2baeb52494cb..6bee4f878d3d 100644
--- a/src/mainboard/google/poppy/variants/rammus/Makefile.inc
+++ b/src/mainboard/google/poppy/variants/rammus/Makefile.inc
@@ -1,3 +1,5 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
SPD_SOURCES = micron_dimm_MT52L512M32D2PF-093 # 0b0000
SPD_SOURCES += samsung_dimm_K4E8E324EB-EGCF # 0b0001
SPD_SOURCES += micron_dimm_MT52L256M32D1PF-093 # 0b0010
diff --git a/src/mainboard/google/poppy/variants/soraka/Makefile.inc b/src/mainboard/google/poppy/variants/soraka/Makefile.inc
index 9b14da6c81ed..ec06f40e9d9e 100644
--- a/src/mainboard/google/poppy/variants/soraka/Makefile.inc
+++ b/src/mainboard/google/poppy/variants/soraka/Makefile.inc
@@ -1,3 +1,4 @@
+## SPDX-License-Identifier: GPL-2.0-only
SPD_SOURCES = empty # 0b0000
SPD_SOURCES += micron_dimm_MT52L256M64D2PP-107 # 0b0001
diff --git a/src/mainboard/google/reef/Makefile.inc b/src/mainboard/google/reef/Makefile.inc
index dd49610f89cc..accb4633f37c 100644
--- a/src/mainboard/google/reef/Makefile.inc
+++ b/src/mainboard/google/reef/Makefile.inc
@@ -1,3 +1,5 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
bootblock-y += bootblock.c
bootblock-y += ec.c
diff --git a/src/mainboard/google/reef/variants/baseboard/Makefile.inc b/src/mainboard/google/reef/variants/baseboard/Makefile.inc
index 1484261aede6..8ee85aff936c 100644
--- a/src/mainboard/google/reef/variants/baseboard/Makefile.inc
+++ b/src/mainboard/google/reef/variants/baseboard/Makefile.inc
@@ -1,3 +1,5 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
bootblock-y += gpio.c
romstage-y += gpio.c
diff --git a/src/mainboard/google/reef/variants/coral/Makefile.inc b/src/mainboard/google/reef/variants/coral/Makefile.inc
index 440ec9c545d2..9ec0276a096f 100644
--- a/src/mainboard/google/reef/variants/coral/Makefile.inc
+++ b/src/mainboard/google/reef/variants/coral/Makefile.inc
@@ -1,3 +1,5 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
bootblock-y += gpio.c
ramstage-y += mainboard.c
diff --git a/src/mainboard/google/reef/variants/pyro/Makefile.inc b/src/mainboard/google/reef/variants/pyro/Makefile.inc
index fd45b948ff46..be05cd4e5c6c 100644
--- a/src/mainboard/google/reef/variants/pyro/Makefile.inc
+++ b/src/mainboard/google/reef/variants/pyro/Makefile.inc
@@ -1 +1,3 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
romstage-y += memory.c
diff --git a/src/mainboard/google/reef/variants/snappy/Makefile.inc b/src/mainboard/google/reef/variants/snappy/Makefile.inc
index f3c87b231856..ffdfd17716b0 100644
--- a/src/mainboard/google/reef/variants/snappy/Makefile.inc
+++ b/src/mainboard/google/reef/variants/snappy/Makefile.inc
@@ -1 +1,3 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
ramstage-y += mainboard.c
diff --git a/src/mainboard/google/rex/Makefile.inc b/src/mainboard/google/rex/Makefile.inc
index cd6be1373870..8c60c591aa42 100644
--- a/src/mainboard/google/rex/Makefile.inc
+++ b/src/mainboard/google/rex/Makefile.inc
@@ -1,3 +1,5 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
bootblock-y += bootblock.c
verstage-$(CONFIG_CHROMEOS) += chromeos.c
diff --git a/src/mainboard/google/rex/variants/baseboard/ovis/Makefile.inc b/src/mainboard/google/rex/variants/baseboard/ovis/Makefile.inc
index bb3620adae7c..2bf1925f37f0 100644
--- a/src/mainboard/google/rex/variants/baseboard/ovis/Makefile.inc
+++ b/src/mainboard/google/rex/variants/baseboard/ovis/Makefile.inc
@@ -1,3 +1,5 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
romstage-y += memory.c
ramstage-y += ramstage.c
diff --git a/src/mainboard/google/rex/variants/baseboard/rex/Makefile.inc b/src/mainboard/google/rex/variants/baseboard/rex/Makefile.inc
index bb3620adae7c..2bf1925f37f0 100644
--- a/src/mainboard/google/rex/variants/baseboard/rex/Makefile.inc
+++ b/src/mainboard/google/rex/variants/baseboard/rex/Makefile.inc
@@ -1,3 +1,5 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
romstage-y += memory.c
ramstage-y += ramstage.c
diff --git a/src/mainboard/google/rex/variants/karis/Makefile.inc b/src/mainboard/google/rex/variants/karis/Makefile.inc
index 6c2934647040..a49954cc3513 100644
--- a/src/mainboard/google/rex/variants/karis/Makefile.inc
+++ b/src/mainboard/google/rex/variants/karis/Makefile.inc
@@ -1,3 +1,5 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
bootblock-y += gpio.c
romstage-y += gpio.c
diff --git a/src/mainboard/google/rex/variants/ovis/Makefile.inc b/src/mainboard/google/rex/variants/ovis/Makefile.inc
index b7851227d7db..4c33dad4dbbc 100644
--- a/src/mainboard/google/rex/variants/ovis/Makefile.inc
+++ b/src/mainboard/google/rex/variants/ovis/Makefile.inc
@@ -1,3 +1,5 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
bootblock-y += gpio.c
romstage-y += gpio.c
romstage-y += memory.c
diff --git a/src/mainboard/google/rex/variants/rex0/Makefile.inc b/src/mainboard/google/rex/variants/rex0/Makefile.inc
index cdbf407ca585..0f9a28b2b577 100644
--- a/src/mainboard/google/rex/variants/rex0/Makefile.inc
+++ b/src/mainboard/google/rex/variants/rex0/Makefile.inc
@@ -1,3 +1,5 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
bootblock-y += gpio.c
romstage-y += gpio.c
ramstage-y += gpio.c
diff --git a/src/mainboard/google/rex/variants/screebo/Makefile.inc b/src/mainboard/google/rex/variants/screebo/Makefile.inc
index 192041b425ff..8bea0ff3904d 100644
--- a/src/mainboard/google/rex/variants/screebo/Makefile.inc
+++ b/src/mainboard/google/rex/variants/screebo/Makefile.inc
@@ -1,3 +1,5 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
bootblock-y += gpio.c
romstage-y += gpio.c
diff --git a/src/mainboard/google/skyrim/variants/baseboard/Makefile.inc b/src/mainboard/google/skyrim/variants/baseboard/Makefile.inc
index 7828cf1bff70..0f7cc89975d4 100644
--- a/src/mainboard/google/skyrim/variants/baseboard/Makefile.inc
+++ b/src/mainboard/google/skyrim/variants/baseboard/Makefile.inc
@@ -1,3 +1,5 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
bootblock-y += gpio.c
romstage-y += gpio.c
diff --git a/src/mainboard/hp/compaq_8200_elite_sff/Makefile.inc b/src/mainboard/hp/compaq_8200_elite_sff/Makefile.inc
index f0b34f984011..2099428db978 100644
--- a/src/mainboard/hp/compaq_8200_elite_sff/Makefile.inc
+++ b/src/mainboard/hp/compaq_8200_elite_sff/Makefile.inc
@@ -1,3 +1,5 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
bootblock-y += gpio.c
romstage-y += gpio.c
ramstage-$(CONFIG_MAINBOARD_USE_LIBGFXINIT) += gma-mainboard.ads
diff --git a/src/mainboard/hp/compaq_elite_8300_usdt/Makefile.inc b/src/mainboard/hp/compaq_elite_8300_usdt/Makefile.inc
index 18391d8b18dd..fb492d358372 100644
--- a/src/mainboard/hp/compaq_elite_8300_usdt/Makefile.inc
+++ b/src/mainboard/hp/compaq_elite_8300_usdt/Makefile.inc
@@ -1,3 +1,5 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
bootblock-y += early_init.c
bootblock-y += gpio.c
romstage-y += early_init.c
diff --git a/src/mainboard/hp/folio_9480m/Makefile.inc b/src/mainboard/hp/folio_9480m/Makefile.inc
index ebe01aea99c1..6f4727ab814f 100644
--- a/src/mainboard/hp/folio_9480m/Makefile.inc
+++ b/src/mainboard/hp/folio_9480m/Makefile.inc
@@ -1,2 +1,4 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
romstage-y += gpio.c
ramstage-$(CONFIG_MAINBOARD_USE_LIBGFXINIT) += gma-mainboard.ads
diff --git a/src/mainboard/hp/z220_series/Makefile.inc b/src/mainboard/hp/z220_series/Makefile.inc
index 00426a88b947..69ef08873b63 100644
--- a/src/mainboard/hp/z220_series/Makefile.inc
+++ b/src/mainboard/hp/z220_series/Makefile.inc
@@ -1,3 +1,5 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
bootblock-y += variants/$(VARIANT_DIR)/gpio.c
romstage-y += variants/$(VARIANT_DIR)/gpio.c
ramstage-$(CONFIG_MAINBOARD_USE_LIBGFXINIT) += gma-mainboard.ads
diff --git a/src/mainboard/ibase/mb899/Makefile.inc b/src/mainboard/ibase/mb899/Makefile.inc
index 992c3736a752..ad8a084da82f 100644
--- a/src/mainboard/ibase/mb899/Makefile.inc
+++ b/src/mainboard/ibase/mb899/Makefile.inc
@@ -1,3 +1,5 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
ramstage-y += superio_hwm.c
ramstage-y += cstates.c
romstage-y += gpio.c
diff --git a/src/mainboard/ibm/sbp1/Makefile.inc b/src/mainboard/ibm/sbp1/Makefile.inc
index 0688aa1973d9..4c7a7beee194 100644
--- a/src/mainboard/ibm/sbp1/Makefile.inc
+++ b/src/mainboard/ibm/sbp1/Makefile.inc
@@ -1,3 +1,5 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
bootblock-y += bootblock.c
romstage-y += romstage.c
ramstage-y += ramstage.c
diff --git a/src/mainboard/intel/apollolake_rvp/Makefile.inc b/src/mainboard/intel/apollolake_rvp/Makefile.inc
index 8501868fbfe4..d604d021c51c 100644
--- a/src/mainboard/intel/apollolake_rvp/Makefile.inc
+++ b/src/mainboard/intel/apollolake_rvp/Makefile.inc
@@ -1 +1,3 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
bootblock-y += bootblock.c
diff --git a/src/mainboard/intel/archercity_crb/Makefile.inc b/src/mainboard/intel/archercity_crb/Makefile.inc
index 0688aa1973d9..4c7a7beee194 100644
--- a/src/mainboard/intel/archercity_crb/Makefile.inc
+++ b/src/mainboard/intel/archercity_crb/Makefile.inc
@@ -1,3 +1,5 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
bootblock-y += bootblock.c
romstage-y += romstage.c
ramstage-y += ramstage.c
diff --git a/src/mainboard/intel/cedarisland_crb/Makefile.inc b/src/mainboard/intel/cedarisland_crb/Makefile.inc
index 3da456e436d7..bf162bb01ed7 100644
--- a/src/mainboard/intel/cedarisland_crb/Makefile.inc
+++ b/src/mainboard/intel/cedarisland_crb/Makefile.inc
@@ -1,3 +1,5 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
bootblock-y += bootblock.c
romstage-y += romstage.c
ramstage-y += ramstage.c
diff --git a/src/mainboard/intel/coffeelake_rvp/variants/baseboard/Makefile.inc b/src/mainboard/intel/coffeelake_rvp/variants/baseboard/Makefile.inc
index 0ad298b5f46e..476f28f18ce3 100644
--- a/src/mainboard/intel/coffeelake_rvp/variants/baseboard/Makefile.inc
+++ b/src/mainboard/intel/coffeelake_rvp/variants/baseboard/Makefile.inc
@@ -1,3 +1,5 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
bootblock-y += gpio.c
ramstage-y += gpio.c
diff --git a/src/mainboard/intel/d510mo/Makefile.inc b/src/mainboard/intel/d510mo/Makefile.inc
index f87689b8a1d1..e546b9d6a504 100644
--- a/src/mainboard/intel/d510mo/Makefile.inc
+++ b/src/mainboard/intel/d510mo/Makefile.inc
@@ -1,3 +1,5 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
bootblock-y += early_init.c
romstage-y += early_init.c
ramstage-y += cstates.c
diff --git a/src/mainboard/intel/d945gclf/Makefile.inc b/src/mainboard/intel/d945gclf/Makefile.inc
index a34f3f31c78e..95250e28a6b3 100644
--- a/src/mainboard/intel/d945gclf/Makefile.inc
+++ b/src/mainboard/intel/d945gclf/Makefile.inc
@@ -1,3 +1,5 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
ramstage-y += cstates.c
romstage-y += gpio.c
bootblock-y += early_init.c
diff --git a/src/mainboard/intel/dcp847ske/Makefile.inc b/src/mainboard/intel/dcp847ske/Makefile.inc
index 08aa2ddde796..f8c155e4c3f6 100644
--- a/src/mainboard/intel/dcp847ske/Makefile.inc
+++ b/src/mainboard/intel/dcp847ske/Makefile.inc
@@ -1,3 +1,5 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
bootblock-y += early_southbridge.c
romstage-y += early_southbridge.c
bootblock-y += gpio.c
diff --git a/src/mainboard/intel/dg41wv/Makefile.inc b/src/mainboard/intel/dg41wv/Makefile.inc
index 4100476891a2..de8c51494dc2 100644
--- a/src/mainboard/intel/dg41wv/Makefile.inc
+++ b/src/mainboard/intel/dg41wv/Makefile.inc
@@ -1,3 +1,5 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
ramstage-y += cstates.c
romstage-y += gpio.c
diff --git a/src/mainboard/intel/dq67sw/Makefile.inc b/src/mainboard/intel/dq67sw/Makefile.inc
index 18391d8b18dd..fb492d358372 100644
--- a/src/mainboard/intel/dq67sw/Makefile.inc
+++ b/src/mainboard/intel/dq67sw/Makefile.inc
@@ -1,3 +1,5 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
bootblock-y += early_init.c
bootblock-y += gpio.c
romstage-y += early_init.c
diff --git a/src/mainboard/intel/glkrvp/Makefile.inc b/src/mainboard/intel/glkrvp/Makefile.inc
index 72247b2341df..965a6f86ffe1 100644
--- a/src/mainboard/intel/glkrvp/Makefile.inc
+++ b/src/mainboard/intel/glkrvp/Makefile.inc
@@ -1,3 +1,5 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
bootblock-y += bootblock.c
bootblock-y += ec.c
diff --git a/src/mainboard/intel/glkrvp/variants/baseboard/Makefile.inc b/src/mainboard/intel/glkrvp/variants/baseboard/Makefile.inc
index d2d344c5e0e5..b0d35e84bcf0 100644
--- a/src/mainboard/intel/glkrvp/variants/baseboard/Makefile.inc
+++ b/src/mainboard/intel/glkrvp/variants/baseboard/Makefile.inc
@@ -1,3 +1,5 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
bootblock-y += gpio.c
romstage-y += boardid.c
diff --git a/src/mainboard/intel/leafhill/Makefile.inc b/src/mainboard/intel/leafhill/Makefile.inc
index c3077e7c7ec4..ec5b26252afc 100644
--- a/src/mainboard/intel/leafhill/Makefile.inc
+++ b/src/mainboard/intel/leafhill/Makefile.inc
@@ -1,3 +1,5 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
bootblock-y += bootblock.c
romstage-y += romstage.c
diff --git a/src/mainboard/intel/minnow3/Makefile.inc b/src/mainboard/intel/minnow3/Makefile.inc
index 3e9bf68af534..a90af2962bd5 100644
--- a/src/mainboard/intel/minnow3/Makefile.inc
+++ b/src/mainboard/intel/minnow3/Makefile.inc
@@ -1,3 +1,5 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
bootblock-y += bootblock.c
bootblock-y += gpio.c
diff --git a/src/mainboard/inventec/transformers/Makefile.inc b/src/mainboard/inventec/transformers/Makefile.inc
index 7619419f674b..ecb6ef2217fc 100644
--- a/src/mainboard/inventec/transformers/Makefile.inc
+++ b/src/mainboard/inventec/transformers/Makefile.inc
@@ -1,3 +1,5 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
bootblock-y += bootblock.c
romstage-y += romstage.c
romstage-$(CONFIG_IPMI_KCS_ROMSTAGE) += ipmi.c
diff --git a/src/mainboard/kontron/986lcd-m/Makefile.inc b/src/mainboard/kontron/986lcd-m/Makefile.inc
index a34f3f31c78e..95250e28a6b3 100644
--- a/src/mainboard/kontron/986lcd-m/Makefile.inc
+++ b/src/mainboard/kontron/986lcd-m/Makefile.inc
@@ -1,3 +1,5 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
ramstage-y += cstates.c
romstage-y += gpio.c
bootblock-y += early_init.c
diff --git a/src/mainboard/kontron/ktqm77/Makefile.inc b/src/mainboard/kontron/ktqm77/Makefile.inc
index e402ffa605ce..e4b6fbf0f0a5 100644
--- a/src/mainboard/kontron/ktqm77/Makefile.inc
+++ b/src/mainboard/kontron/ktqm77/Makefile.inc
@@ -1,3 +1,5 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
bootblock-y += gpio.c
romstage-y += gpio.c
diff --git a/src/mainboard/kontron/mal10/Makefile.inc b/src/mainboard/kontron/mal10/Makefile.inc
index 7fbab00337bd..2a21e0314669 100644
--- a/src/mainboard/kontron/mal10/Makefile.inc
+++ b/src/mainboard/kontron/mal10/Makefile.inc
@@ -1,3 +1,5 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
bootblock-y += bootblock.c
ramstage-y += ramstage.c
ramstage-$(CONFIG_MAINBOARD_USE_LIBGFXINIT) += variants/$(VARIANT_DIR)/gma-mainboard.ads
diff --git a/src/mainboard/kontron/mal10/carriers/t10-tni/Makefile.inc b/src/mainboard/kontron/mal10/carriers/t10-tni/Makefile.inc
index c291d45ebd07..5d3bcc436e5c 100644
--- a/src/mainboard/kontron/mal10/carriers/t10-tni/Makefile.inc
+++ b/src/mainboard/kontron/mal10/carriers/t10-tni/Makefile.inc
@@ -1 +1,3 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
ramstage-y += gpio.c
diff --git a/src/mainboard/kontron/mal10/variants/mal10/Makefile.inc b/src/mainboard/kontron/mal10/variants/mal10/Makefile.inc
index 4b48156a52b1..f0aa6b19f3b0 100644
--- a/src/mainboard/kontron/mal10/variants/mal10/Makefile.inc
+++ b/src/mainboard/kontron/mal10/variants/mal10/Makefile.inc
@@ -1 +1,3 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
bootblock-y += gpio.c
diff --git a/src/mainboard/lenovo/haswell/Makefile.inc b/src/mainboard/lenovo/haswell/Makefile.inc
index d1300f8f67e5..3861ea195d3b 100644
--- a/src/mainboard/lenovo/haswell/Makefile.inc
+++ b/src/mainboard/lenovo/haswell/Makefile.inc
@@ -1,3 +1,5 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
romstage-y += variants/$(VARIANT_DIR)/gpio.c
romstage-y += variants/$(VARIANT_DIR)/romstage.c
diff --git a/src/mainboard/lenovo/haswell/variants/t440p/Makefile.inc b/src/mainboard/lenovo/haswell/variants/t440p/Makefile.inc
index f3c87b231856..ffdfd17716b0 100644
--- a/src/mainboard/lenovo/haswell/variants/t440p/Makefile.inc
+++ b/src/mainboard/lenovo/haswell/variants/t440p/Makefile.inc
@@ -1 +1,3 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
ramstage-y += mainboard.c
diff --git a/src/mainboard/lenovo/s230u/Makefile.inc b/src/mainboard/lenovo/s230u/Makefile.inc
index 31bb642edf51..073d8b2e90f8 100644
--- a/src/mainboard/lenovo/s230u/Makefile.inc
+++ b/src/mainboard/lenovo/s230u/Makefile.inc
@@ -1,3 +1,5 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
bootblock-y += gpio.c
romstage-y += gpio.c
ramstage-y += ec.c
diff --git a/src/mainboard/lenovo/t430/Makefile.inc b/src/mainboard/lenovo/t430/Makefile.inc
index e402ffa605ce..e4b6fbf0f0a5 100644
--- a/src/mainboard/lenovo/t430/Makefile.inc
+++ b/src/mainboard/lenovo/t430/Makefile.inc
@@ -1,3 +1,5 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
bootblock-y += gpio.c
romstage-y += gpio.c
diff --git a/src/mainboard/lenovo/thinkcentre_a58/Makefile.inc b/src/mainboard/lenovo/thinkcentre_a58/Makefile.inc
index 4100476891a2..de8c51494dc2 100644
--- a/src/mainboard/lenovo/thinkcentre_a58/Makefile.inc
+++ b/src/mainboard/lenovo/thinkcentre_a58/Makefile.inc
@@ -1,3 +1,5 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
ramstage-y += cstates.c
romstage-y += gpio.c
diff --git a/src/mainboard/msi/h81m-p33/Makefile.inc b/src/mainboard/msi/h81m-p33/Makefile.inc
index d9a8d18d0de0..54643607ce06 100644
--- a/src/mainboard/msi/h81m-p33/Makefile.inc
+++ b/src/mainboard/msi/h81m-p33/Makefile.inc
@@ -1,3 +1,5 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
romstage-y += gpio.c
ramstage-$(CONFIG_MAINBOARD_USE_LIBGFXINIT) += gma-mainboard.ads
diff --git a/src/mainboard/msi/ms7707/Makefile.inc b/src/mainboard/msi/ms7707/Makefile.inc
index 2fa05da9ac86..10bd6bcb8834 100644
--- a/src/mainboard/msi/ms7707/Makefile.inc
+++ b/src/mainboard/msi/ms7707/Makefile.inc
@@ -1,3 +1,5 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
bootblock-y += gpio.c
romstage-y += gpio.c
bootblock-y += early_init.c
diff --git a/src/mainboard/siemens/mc_apl1/Makefile.inc b/src/mainboard/siemens/mc_apl1/Makefile.inc
index 124e3806ffda..e179201c9c78 100644
--- a/src/mainboard/siemens/mc_apl1/Makefile.inc
+++ b/src/mainboard/siemens/mc_apl1/Makefile.inc
@@ -1,3 +1,5 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
bootblock-y += bootblock.c
# The inclusion of romstage.c is not necessary here.
diff --git a/src/mainboard/siemens/mc_apl1/variants/baseboard/Makefile.inc b/src/mainboard/siemens/mc_apl1/variants/baseboard/Makefile.inc
index e553581dd505..be05cd4e5c6c 100644
--- a/src/mainboard/siemens/mc_apl1/variants/baseboard/Makefile.inc
+++ b/src/mainboard/siemens/mc_apl1/variants/baseboard/Makefile.inc
@@ -1,2 +1,3 @@
+## SPDX-License-Identifier: GPL-2.0-only
romstage-y += memory.c
diff --git a/src/mainboard/siemens/mc_apl1/variants/mc_apl1/Makefile.inc b/src/mainboard/siemens/mc_apl1/variants/mc_apl1/Makefile.inc
index 3629aca053d2..dff9c79c88a9 100644
--- a/src/mainboard/siemens/mc_apl1/variants/mc_apl1/Makefile.inc
+++ b/src/mainboard/siemens/mc_apl1/variants/mc_apl1/Makefile.inc
@@ -1,3 +1,5 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
bootblock-y += gpio.c
ramstage-y += gpio.c
diff --git a/src/mainboard/siemens/mc_apl1/variants/mc_apl2/Makefile.inc b/src/mainboard/siemens/mc_apl1/variants/mc_apl2/Makefile.inc
index 152b46ece113..f2a034c8c827 100644
--- a/src/mainboard/siemens/mc_apl1/variants/mc_apl2/Makefile.inc
+++ b/src/mainboard/siemens/mc_apl1/variants/mc_apl2/Makefile.inc
@@ -1,3 +1,5 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
bootblock-y += gpio.c
ramstage-y += gpio.c
diff --git a/src/mainboard/siemens/mc_apl1/variants/mc_apl3/Makefile.inc b/src/mainboard/siemens/mc_apl1/variants/mc_apl3/Makefile.inc
index 152b46ece113..f2a034c8c827 100644
--- a/src/mainboard/siemens/mc_apl1/variants/mc_apl3/Makefile.inc
+++ b/src/mainboard/siemens/mc_apl1/variants/mc_apl3/Makefile.inc
@@ -1,3 +1,5 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
bootblock-y += gpio.c
ramstage-y += gpio.c
diff --git a/src/mainboard/siemens/mc_apl1/variants/mc_apl4/Makefile.inc b/src/mainboard/siemens/mc_apl1/variants/mc_apl4/Makefile.inc
index e26339c5484a..621ffd13fa56 100644
--- a/src/mainboard/siemens/mc_apl1/variants/mc_apl4/Makefile.inc
+++ b/src/mainboard/siemens/mc_apl1/variants/mc_apl4/Makefile.inc
@@ -1,3 +1,5 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
bootblock-y += gpio.c
romstage-y += memory.c
diff --git a/src/mainboard/siemens/mc_apl1/variants/mc_apl5/Makefile.inc b/src/mainboard/siemens/mc_apl1/variants/mc_apl5/Makefile.inc
index 3629aca053d2..dff9c79c88a9 100644
--- a/src/mainboard/siemens/mc_apl1/variants/mc_apl5/Makefile.inc
+++ b/src/mainboard/siemens/mc_apl1/variants/mc_apl5/Makefile.inc
@@ -1,3 +1,5 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
bootblock-y += gpio.c
ramstage-y += gpio.c
diff --git a/src/mainboard/siemens/mc_apl1/variants/mc_apl6/Makefile.inc b/src/mainboard/siemens/mc_apl1/variants/mc_apl6/Makefile.inc
index 152b46ece113..f2a034c8c827 100644
--- a/src/mainboard/siemens/mc_apl1/variants/mc_apl6/Makefile.inc
+++ b/src/mainboard/siemens/mc_apl1/variants/mc_apl6/Makefile.inc
@@ -1,3 +1,5 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
bootblock-y += gpio.c
ramstage-y += gpio.c
diff --git a/src/mainboard/siemens/mc_apl1/variants/mc_apl7/Makefile.inc b/src/mainboard/siemens/mc_apl1/variants/mc_apl7/Makefile.inc
index ecab3ccc3391..af6f16c3ec0a 100644
--- a/src/mainboard/siemens/mc_apl1/variants/mc_apl7/Makefile.inc
+++ b/src/mainboard/siemens/mc_apl1/variants/mc_apl7/Makefile.inc
@@ -1,3 +1,5 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
bootblock-y += gpio.c
romstage-y += memory.c
diff --git a/src/mainboard/supermicro/x9scl/Makefile.inc b/src/mainboard/supermicro/x9scl/Makefile.inc
index 3465dfeca633..c83c7f361857 100644
--- a/src/mainboard/supermicro/x9scl/Makefile.inc
+++ b/src/mainboard/supermicro/x9scl/Makefile.inc
@@ -1,3 +1,5 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
bootblock-y += early_init.c
bootblock-y += gpio.c
romstage-y += early_init.c
diff --git a/src/mainboard/system76/addw1/Makefile.inc b/src/mainboard/system76/addw1/Makefile.inc
index fedde68c13d5..09424595d72c 100644
--- a/src/mainboard/system76/addw1/Makefile.inc
+++ b/src/mainboard/system76/addw1/Makefile.inc
@@ -1,3 +1,5 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
CPPFLAGS_common += -I$(src)/mainboard/$(MAINBOARDDIR)/include
bootblock-y += bootblock.c
diff --git a/src/mainboard/system76/adl/Makefile.inc b/src/mainboard/system76/adl/Makefile.inc
index 9dea9f3b1fec..c5334f1f0cf4 100644
--- a/src/mainboard/system76/adl/Makefile.inc
+++ b/src/mainboard/system76/adl/Makefile.inc
@@ -1,3 +1,5 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
CPPFLAGS_common += -I$(src)/mainboard/$(MAINBOARDDIR)/include
bootblock-y += bootblock.c
diff --git a/src/mainboard/system76/bonw14/Makefile.inc b/src/mainboard/system76/bonw14/Makefile.inc
index a866021880e9..2efcac5f428a 100644
--- a/src/mainboard/system76/bonw14/Makefile.inc
+++ b/src/mainboard/system76/bonw14/Makefile.inc
@@ -1,3 +1,5 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
CPPFLAGS_common += -I$(src)/mainboard/$(MAINBOARDDIR)/include
bootblock-y += bootblock.c
diff --git a/src/mainboard/system76/cml-u/Makefile.inc b/src/mainboard/system76/cml-u/Makefile.inc
index 51ad54367e22..921112cee916 100644
--- a/src/mainboard/system76/cml-u/Makefile.inc
+++ b/src/mainboard/system76/cml-u/Makefile.inc
@@ -1,3 +1,5 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
CPPFLAGS_common += -I$(src)/mainboard/$(MAINBOARDDIR)/include
bootblock-y += bootblock.c
diff --git a/src/mainboard/system76/gaze15/Makefile.inc b/src/mainboard/system76/gaze15/Makefile.inc
index 32a409992fe9..72f13667d314 100644
--- a/src/mainboard/system76/gaze15/Makefile.inc
+++ b/src/mainboard/system76/gaze15/Makefile.inc
@@ -1,3 +1,5 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
CPPFLAGS_common += -I$(src)/mainboard/$(MAINBOARDDIR)/include
bootblock-y += bootblock.c
diff --git a/src/mainboard/system76/kbl-u/Makefile.inc b/src/mainboard/system76/kbl-u/Makefile.inc
index d749e412cce0..bf3828de9685 100644
--- a/src/mainboard/system76/kbl-u/Makefile.inc
+++ b/src/mainboard/system76/kbl-u/Makefile.inc
@@ -1,3 +1,5 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
CPPFLAGS_common += -I$(src)/mainboard/$(MAINBOARDDIR)/include
bootblock-y += bootblock.c
diff --git a/src/mainboard/system76/oryp5/Makefile.inc b/src/mainboard/system76/oryp5/Makefile.inc
index 7c0701e97c06..e52cccafc8c2 100644
--- a/src/mainboard/system76/oryp5/Makefile.inc
+++ b/src/mainboard/system76/oryp5/Makefile.inc
@@ -1,3 +1,5 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
CPPFLAGS_common += -I$(src)/mainboard/$(MAINBOARDDIR)/include
bootblock-y += bootblock.c
diff --git a/src/mainboard/system76/oryp6/Makefile.inc b/src/mainboard/system76/oryp6/Makefile.inc
index 2267eb6f9f69..ab8e965d8727 100644
--- a/src/mainboard/system76/oryp6/Makefile.inc
+++ b/src/mainboard/system76/oryp6/Makefile.inc
@@ -1,3 +1,5 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
CPPFLAGS_common += -I$(src)/mainboard/$(MAINBOARDDIR)/include
bootblock-y += bootblock.c
diff --git a/src/mainboard/system76/tgl-u/Makefile.inc b/src/mainboard/system76/tgl-u/Makefile.inc
index ca14835be792..28ada02313e9 100644
--- a/src/mainboard/system76/tgl-u/Makefile.inc
+++ b/src/mainboard/system76/tgl-u/Makefile.inc
@@ -1,3 +1,5 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
CPPFLAGS_common += -I$(src)/mainboard/$(MAINBOARDDIR)/include
ifeq ($(CONFIG_BOARD_SYSTEM76_GALP5),y)
diff --git a/src/mainboard/system76/whl-u/Makefile.inc b/src/mainboard/system76/whl-u/Makefile.inc
index d749e412cce0..bf3828de9685 100644
--- a/src/mainboard/system76/whl-u/Makefile.inc
+++ b/src/mainboard/system76/whl-u/Makefile.inc
@@ -1,3 +1,5 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
CPPFLAGS_common += -I$(src)/mainboard/$(MAINBOARDDIR)/include
bootblock-y += bootblock.c
diff --git a/src/mainboard/up/squared/Makefile.inc b/src/mainboard/up/squared/Makefile.inc
index af2508e8cf68..68ddfca420c4 100644
--- a/src/mainboard/up/squared/Makefile.inc
+++ b/src/mainboard/up/squared/Makefile.inc
@@ -1,3 +1,5 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
bootblock-y += bootblock.c
romstage-y += romstage.c