diff --git a/buildroot-external/board/raspberrypi/rootfs-overlay/etc/udev/rules.d/99-com.rules b/buildroot-external/board/raspberrypi/rootfs-overlay/etc/udev/rules.d/99-com.rules
index 6904e602..2e61f365 100644
--- a/buildroot-external/board/raspberrypi/rootfs-overlay/etc/udev/rules.d/99-com.rules
+++ b/buildroot-external/board/raspberrypi/rootfs-overlay/etc/udev/rules.d/99-com.rules
@@ -11,3 +11,25 @@ SUBSYSTEM=="gpio*", PROGRAM="/bin/sh -c '\
         chown -R root:gpio /sys/devices/virtual/gpio && chmod -R 770 /sys/devices/virtual/gpio;\
         chown -R root:gpio /sys$devpath && chmod -R 770 /sys$devpath\
 '"
+
+KERNEL=="ttyAMA[01]", PROGRAM="/bin/sh -c '\
+        ALIASES=/proc/device-tree/aliases; \
+        if cmp -s $ALIASES/uart0 $ALIASES/serial0; then \
+                echo 0;\
+        elif cmp -s $ALIASES/uart0 $ALIASES/serial1; then \
+                echo 1; \
+        else \
+                exit 1; \
+        fi\
+'", SYMLINK+="serial%c"
+
+KERNEL=="ttyS0", PROGRAM="/bin/sh -c '\
+        ALIASES=/proc/device-tree/aliases; \
+        if cmp -s $ALIASES/uart1 $ALIASES/serial0; then \
+                echo 0; \
+        elif cmp -s $ALIASES/uart1 $ALIASES/serial1; then \
+                echo 1; \
+        else \
+                exit 1; \
+        fi \
+'", SYMLINK+="serial%c"