diff --git a/bao-ci b/bao-ci
deleted file mode 160000
index 83be2dd..0000000
--- a/bao-ci
+++ /dev/null
@@ -1 +0,0 @@
-Subproject commit 83be2dd1235f310c2ea43458b83c2ac80117be95
diff --git a/pkgs/atf/atf.nix b/pkgs/atf/atf.nix
index 9bfd260..8620b61 100644
--- a/pkgs/atf/atf.nix
+++ b/pkgs/atf/atf.nix
@@ -1,3 +1,6 @@
+# SPDX-License-Identifier: Apache-2.0
+# Copyright (c) Bao Project and Contributors. All rights reserved.
+
 { stdenv
 , fetchFromGitHub
 , toolchain
diff --git a/pkgs/bao-tests/bao-tests.nix b/pkgs/bao-tests/bao-tests.nix
index 6b6cd7b..abb67aa 100644
--- a/pkgs/bao-tests/bao-tests.nix
+++ b/pkgs/bao-tests/bao-tests.nix
@@ -1,3 +1,6 @@
+# SPDX-License-Identifier: Apache-2.0
+# Copyright (c) Bao Project and Contributors. All rights reserved.
+
 { stdenv
 , fetchFromGitHub
 }:
diff --git a/pkgs/bao/bao.nix b/pkgs/bao/bao.nix
index 4fbef53..a728b8d 100644
--- a/pkgs/bao/bao.nix
+++ b/pkgs/bao/bao.nix
@@ -1,3 +1,6 @@
+# SPDX-License-Identifier: Apache-2.0
+# Copyright (c) Bao Project and Contributors. All rights reserved.
+
 { stdenv
 , fetchFromGitHub
 , fetchurl
diff --git a/pkgs/bao/bao_tf.nix b/pkgs/bao/bao_tf.nix
index 9c05023..4e94b89 100644
--- a/pkgs/bao/bao_tf.nix
+++ b/pkgs/bao/bao_tf.nix
@@ -1,3 +1,6 @@
+# SPDX-License-Identifier: Apache-2.0
+# Copyright (c) Bao Project and Contributors. All rights reserved.
+
 { stdenv
 , fetchFromGitHub
 , fetchurl
diff --git a/pkgs/demos/demos.nix b/pkgs/demos/demos.nix
index a089419..852e098 100644
--- a/pkgs/demos/demos.nix
+++ b/pkgs/demos/demos.nix
@@ -1,3 +1,6 @@
+# SPDX-License-Identifier: Apache-2.0
+# Copyright (c) Bao Project and Contributors. All rights reserved.
+
 { stdenv
 , fetchFromGitHub
 }:
diff --git a/pkgs/guest/baremetal-bao-tf.nix b/pkgs/guest/baremetal-bao-tf.nix
index 46e456f..93e3ff3 100644
--- a/pkgs/guest/baremetal-bao-tf.nix
+++ b/pkgs/guest/baremetal-bao-tf.nix
@@ -1,3 +1,6 @@
+# SPDX-License-Identifier: Apache-2.0
+# Copyright (c) Bao Project and Contributors. All rights reserved.
+
 { stdenv
 , fetchFromGitHub
 , toolchain
diff --git a/pkgs/guest/baremetal-guest.nix b/pkgs/guest/baremetal-guest.nix
index 8607665..d32ec64 100644
--- a/pkgs/guest/baremetal-guest.nix
+++ b/pkgs/guest/baremetal-guest.nix
@@ -1,3 +1,6 @@
+# SPDX-License-Identifier: Apache-2.0
+# Copyright (c) Bao Project and Contributors. All rights reserved.
+
 { stdenv
 , fetchFromGitHub
 , toolchain
diff --git a/pkgs/guest/baremetal-tf.nix b/pkgs/guest/baremetal-tf.nix
index c42c3b7..4b86e7e 100644
--- a/pkgs/guest/baremetal-tf.nix
+++ b/pkgs/guest/baremetal-tf.nix
@@ -1,3 +1,6 @@
+# SPDX-License-Identifier: Apache-2.0
+# Copyright (c) Bao Project and Contributors. All rights reserved.
+
 { stdenv
 , fetchFromGitHub
 , toolchain
diff --git a/pkgs/tests/tests.nix b/pkgs/tests/tests.nix
index 2a8a31d..7c88297 100644
--- a/pkgs/tests/tests.nix
+++ b/pkgs/tests/tests.nix
@@ -1,3 +1,6 @@
+# SPDX-License-Identifier: Apache-2.0
+# Copyright (c) Bao Project and Contributors. All rights reserved.
+
 { stdenv
 , fetchFromGitHub
 }:
diff --git a/pkgs/toolchains/aarch64-none-elf-11-3.nix b/pkgs/toolchains/aarch64-none-elf-11-3.nix
index df98bb9..86cf348 100644
--- a/pkgs/toolchains/aarch64-none-elf-11-3.nix
+++ b/pkgs/toolchains/aarch64-none-elf-11-3.nix
@@ -1,3 +1,6 @@
+# SPDX-License-Identifier: Apache-2.0
+# Copyright (c) Bao Project and Contributors. All rights reserved.
+
 { lib
 , stdenv
 , fetchurl
diff --git a/pkgs/u-boot/u-boot.nix b/pkgs/u-boot/u-boot.nix
index 3497897..44a863f 100644
--- a/pkgs/u-boot/u-boot.nix
+++ b/pkgs/u-boot/u-boot.nix
@@ -1,3 +1,6 @@
+# SPDX-License-Identifier: Apache-2.0
+# Copyright (c) Bao Project and Contributors. All rights reserved.
+
 { stdenv
 , fetchFromGitHub
 , toolchain