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-rw-r--r--sys/conf/NOTES4
-rw-r--r--sys/conf/options3
2 files changed, 7 insertions, 0 deletions
diff --git a/sys/conf/NOTES b/sys/conf/NOTES
index a85846bf8a6d..e5ae8a411bb1 100644
--- a/sys/conf/NOTES
+++ b/sys/conf/NOTES
@@ -1465,6 +1465,10 @@ options CONSPEED=115200 # Speed for serial console
#
device uart
+# Options for uart(4)
+options UART_PPS_ON_CTS # Do time pulse capturing using CTS
+ # instead of DCD.
+
# The following hint should only be used for pure ISA devices. It is not
# needed otherwise. Use of hints is strongly discouraged.
hint.uart.0.at="isa"
diff --git a/sys/conf/options b/sys/conf/options
index 09926466bf17..38b1d01fda97 100644
--- a/sys/conf/options
+++ b/sys/conf/options
@@ -537,6 +537,9 @@ COM_MULTIPORT opt_sio.h
BREAK_TO_DEBUGGER opt_comconsole.h
ALT_BREAK_TO_DEBUGGER opt_comconsole.h
+# Options to support PPS
+UART_PPS_ON_CTS opt_uart.h
+
# options for bus/device framework
BUS_DEBUG opt_bus.h