diff --git a/tools/firmware-utils/src/bcm_tag.h b/tools/firmware-utils/src/bcm_tag.h
index 2730edc9ad993febc5894dfb337e00172a431fec..a0d560884f382b24ea29d98647124a01fcecfa1c 100644
--- a/tools/firmware-utils/src/bcm_tag.h
+++ b/tools/firmware-utils/src/bcm_tag.h
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
 #ifndef __BCM63XX_TAG_H
 #define __BCM63XX_TAG_H
 
diff --git a/tools/firmware-utils/src/bcmalgo.c b/tools/firmware-utils/src/bcmalgo.c
index c0865a183badcd8b3b0483f04ee2b6a79fee706f..fd6c1c116edd4512ce70f3275d9a887eb4215461 100644
--- a/tools/firmware-utils/src/bcmalgo.c
+++ b/tools/firmware-utils/src/bcmalgo.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
 #include <stdlib.h>
 #include <sys/types.h>
 #include <stdio.h>
diff --git a/tools/firmware-utils/src/bcmalgo.h b/tools/firmware-utils/src/bcmalgo.h
index 46647cf6d3dbb32adfd1f651e85aa320f30868b3..9aec7d19311e3e40c35ba467b99f3d35af901931 100644
--- a/tools/firmware-utils/src/bcmalgo.h
+++ b/tools/firmware-utils/src/bcmalgo.h
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
 #ifndef bcmutils_H
 #define bcmutils_H
 
diff --git a/tools/firmware-utils/src/dgfirmware.c b/tools/firmware-utils/src/dgfirmware.c
index 3ec4712ec9351328bcaf104ce0b6336f44a599bd..c5549c82be867f075bb182183e72ae92459b489a 100644
--- a/tools/firmware-utils/src/dgfirmware.c
+++ b/tools/firmware-utils/src/dgfirmware.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
 #include <stdlib.h>
 #include <stdio.h>
 #include <string.h>
diff --git a/tools/firmware-utils/src/hcsmakeimage.c b/tools/firmware-utils/src/hcsmakeimage.c
index 2888810cc7e4c1c5f3d6c3a31dae103f64405105..ce954cfcc9380b7871cbe3f7c8deef1477528b6f 100644
--- a/tools/firmware-utils/src/hcsmakeimage.c
+++ b/tools/firmware-utils/src/hcsmakeimage.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
 #include <stdlib.h>
 #include <sys/types.h>
 #include <stdio.h>
diff --git a/tools/firmware-utils/src/mkdapimg.c b/tools/firmware-utils/src/mkdapimg.c
index 0031d83dd08ded11f03f42f52db6249450bfa2fe..e8b12599d82d324b12d2d28486f54f04bf192726 100644
--- a/tools/firmware-utils/src/mkdapimg.c
+++ b/tools/firmware-utils/src/mkdapimg.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
 #include <stdio.h>
 #include <stdint.h>
 #include <stdlib.h>
diff --git a/tools/firmware-utils/src/mksercommfw.c b/tools/firmware-utils/src/mksercommfw.c
index f6f1d93f37970be0cdf94e71a5e1093b3e92c040..5fa323f2d55735634b2e5ab1a4412edb5ababd08 100644
--- a/tools/firmware-utils/src/mksercommfw.c
+++ b/tools/firmware-utils/src/mksercommfw.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
 #include <stdio.h>
 #include <string.h>
 #include <stdlib.h>
diff --git a/tools/firmware-utils/src/mktitanimg.c b/tools/firmware-utils/src/mktitanimg.c
index acc21bd64d1d38959a82ace0f06017eee35cd405..654a6bd09bdc7e1460e139fd97ffc12bc9fd5404 100644
--- a/tools/firmware-utils/src/mktitanimg.c
+++ b/tools/firmware-utils/src/mktitanimg.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
diff --git a/tools/firmware-utils/src/mktitanimg.h b/tools/firmware-utils/src/mktitanimg.h
index 9ff30f6088abdbb229d6ceb3969c125fcaaaeac6..27b37b3fdaca5f282e29dfa6ff3890f0a4679ac3 100644
--- a/tools/firmware-utils/src/mktitanimg.h
+++ b/tools/firmware-utils/src/mktitanimg.h
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
 #ifndef __MKTITANIMG_H
 #define __MKTITANIMG_H
 
diff --git a/tools/firmware-utils/src/srec2bin.c b/tools/firmware-utils/src/srec2bin.c
index 95a8195d1a5ad29b9cb6a8258d1dd1c31a97b8d1..ad4222d6939234bcc0a3026d1843be7011e4b92e 100644
--- a/tools/firmware-utils/src/srec2bin.c
+++ b/tools/firmware-utils/src/srec2bin.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
 #include <stdio.h>
 #include <ctype.h>
 #include <string.h>
diff --git a/tools/firmware-utils/src/trx2edips.c b/tools/firmware-utils/src/trx2edips.c
index 14c4eb70ba91320fc891b9a681a2e004714fde0a..e8ac14d8302f3f415ce9bf815a647dd3b279e331 100644
--- a/tools/firmware-utils/src/trx2edips.c
+++ b/tools/firmware-utils/src/trx2edips.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
 #include <stdio.h>
 #include <stdlib.h>
 #include <stddef.h>
diff --git a/tools/firmware-utils/src/utils.h b/tools/firmware-utils/src/utils.h
index 11ec7400690c8599c6dcdf228cdc99b215a08773..b051f5e6c7571cad1b9ddd2af52fb230b04e3043 100644
--- a/tools/firmware-utils/src/utils.h
+++ b/tools/firmware-utils/src/utils.h
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
 #include <stdint.h>
 #include <string.h>
 
diff --git a/tools/firmware-utils/src/wrt400n.c b/tools/firmware-utils/src/wrt400n.c
index 1cf1debc89341d9ffbc7dae94eb5af721a1c6376..a6c1f8038bc24b0616059d6584b2aaca4c692849 100644
--- a/tools/firmware-utils/src/wrt400n.c
+++ b/tools/firmware-utils/src/wrt400n.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
 /*
  * WRT400n - Firmware Generation Creator
  *