Add license headers to new files
diff --git a/drivers/usart/api/BUILD.bazel b/drivers/usart/api/BUILD.bazel
index 740c2c2..8829dea 100644
--- a/drivers/usart/api/BUILD.bazel
+++ b/drivers/usart/api/BUILD.bazel
@@ -1,4 +1,5 @@
 # Licensed under the Apache-2.0 license
+# SPDX-License-Identifier: Apache-2.0
 
 load("@rules_rust//rust:defs.bzl", "rust_library")
 
diff --git a/drivers/usart/api/src/backend.rs b/drivers/usart/api/src/backend.rs
index a33e359..823a81d 100644
--- a/drivers/usart/api/src/backend.rs
+++ b/drivers/usart/api/src/backend.rs
@@ -1,4 +1,5 @@
 // Licensed under the Apache-2.0 license
+// SPDX-License-Identifier: Apache-2.0
 
 use bitflags::bitflags;
 
diff --git a/drivers/usart/api/src/lib.rs b/drivers/usart/api/src/lib.rs
index df40fe1..51fd720 100644
--- a/drivers/usart/api/src/lib.rs
+++ b/drivers/usart/api/src/lib.rs
@@ -1,4 +1,5 @@
 // Licensed under the Apache-2.0 license
+// SPDX-License-Identifier: Apache-2.0
 
 #![no_std]
 
diff --git a/drivers/usart/api/src/protocol.rs b/drivers/usart/api/src/protocol.rs
index d7ddb71..c86fa62 100644
--- a/drivers/usart/api/src/protocol.rs
+++ b/drivers/usart/api/src/protocol.rs
@@ -1,4 +1,5 @@
 // Licensed under the Apache-2.0 license
+// SPDX-License-Identifier: Apache-2.0
 
 use zerocopy::{FromBytes, Immutable, IntoBytes, KnownLayout};
 
diff --git a/drivers/usart/client/BUILD.bazel b/drivers/usart/client/BUILD.bazel
index 744c074..9a1a154 100644
--- a/drivers/usart/client/BUILD.bazel
+++ b/drivers/usart/client/BUILD.bazel
@@ -1,4 +1,5 @@
 # Licensed under the Apache-2.0 license
+# SPDX-License-Identifier: Apache-2.0
 
 load("@rules_rust//rust:defs.bzl", "rust_library")
 load("//target/ast10x0:defs.bzl", "TARGET_COMPATIBLE_WITH")
diff --git a/drivers/usart/client/src/lib.rs b/drivers/usart/client/src/lib.rs
index bc3716b..b94b025 100644
--- a/drivers/usart/client/src/lib.rs
+++ b/drivers/usart/client/src/lib.rs
@@ -1,4 +1,5 @@
 // Licensed under the Apache-2.0 license
+// SPDX-License-Identifier: Apache-2.0
 
 #![no_std]
 
diff --git a/drivers/usart/server/BUILD.bazel b/drivers/usart/server/BUILD.bazel
index 3d7bc32..dc8afbe 100644
--- a/drivers/usart/server/BUILD.bazel
+++ b/drivers/usart/server/BUILD.bazel
@@ -1,4 +1,5 @@
 # Licensed under the Apache-2.0 license
+# SPDX-License-Identifier: Apache-2.0
 
 load("@rules_rust//rust:defs.bzl", "rust_library")
 load("//target/ast10x0:defs.bzl", "TARGET_COMPATIBLE_WITH")
diff --git a/drivers/usart/server/src/lib.rs b/drivers/usart/server/src/lib.rs
index f997d4d..346b374 100644
--- a/drivers/usart/server/src/lib.rs
+++ b/drivers/usart/server/src/lib.rs
@@ -1,4 +1,5 @@
 // Licensed under the Apache-2.0 license
+// SPDX-License-Identifier: Apache-2.0
 
 #![no_std]
 
diff --git a/drivers/usart/server/src/runtime.rs b/drivers/usart/server/src/runtime.rs
index 6af4e33..c7b42da 100644
--- a/drivers/usart/server/src/runtime.rs
+++ b/drivers/usart/server/src/runtime.rs
@@ -1,4 +1,5 @@
 // Licensed under the Apache-2.0 license
+// SPDX-License-Identifier: Apache-2.0
 
 use usart_api::backend::{IrqMask, UsartBackend};
 use usart_api::{UsartResponseHeader};
diff --git a/target/ast10x0/backend/usart/BUILD.bazel b/target/ast10x0/backend/usart/BUILD.bazel
index 3d905c7..eab9f8c 100644
--- a/target/ast10x0/backend/usart/BUILD.bazel
+++ b/target/ast10x0/backend/usart/BUILD.bazel
@@ -1,4 +1,5 @@
 # Licensed under the Apache-2.0 license
+# SPDX-License-Identifier: Apache-2.0
 
 load("@rules_rust//rust:defs.bzl", "rust_library")
 load("//target/ast10x0:defs.bzl", "TARGET_COMPATIBLE_WITH")
diff --git a/target/ast10x0/tests/usart/README.md b/target/ast10x0/tests/usart/README.md
index a2ee742..c0085ce 100644
--- a/target/ast10x0/tests/usart/README.md
+++ b/target/ast10x0/tests/usart/README.md
@@ -55,8 +55,8 @@
 # Run with virt_ast10x0 platform config
 bazelisk test //target/ast10x0/tests/usart:usart_test --config=virt_ast10x0
 
-# With verbose output
-bazelisk test //target/ast10x0/tests/usart:usart_test --config=virt_ast10x0 -s
+# With verbose/streamed output
+bazelisk test //target/ast10x0/tests/usart:usart_test --config=virt_ast10x0 --test_output=streamed
 
 # Show all test output
 bazelisk test //target/ast10x0/tests/usart:usart_test --config=virt_ast10x0 --test_output=all