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-rw-r--r--include/uapi/linux/serial_core.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/include/uapi/linux/serial_core.h b/include/uapi/linux/serial_core.h
index 92e3dd56f631..46e06c483899 100644
--- a/include/uapi/linux/serial_core.h
+++ b/include/uapi/linux/serial_core.h
@@ -11,6 +11,8 @@
* The type definitions. These are from Ted Ts'o's serial.h
* By historical reasons the values from 0 to 13 are defined
* in the include/uapi/linux/serial.h, do not define them here.
+ * Values 0 to 19 are used by setserial from busybox and must never
+ * be modified.
*/
#define PORT_NS16550A 14
#define PORT_XSCALE 15