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-rw-r--r--src/peripheral/tpiu.rs2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/peripheral/tpiu.rs b/src/peripheral/tpiu.rs
index 7a08805..4115bb3 100644
--- a/src/peripheral/tpiu.rs
+++ b/src/peripheral/tpiu.rs
@@ -1,4 +1,6 @@
//! Trace Port Interface Unit;
+//!
+//! *NOTE* Available only on ARMv7-M (`thumbv7*m-none-eabi*`)
use volatile_register::{RO, RW, WO};