diff --git a/sys/arm/conf/CAMBRIA.hints b/sys/arm/conf/CAMBRIA.hints
index 596d53fbb5a..baa70850dab 100644
--- a/sys/arm/conf/CAMBRIA.hints
+++ b/sys/arm/conf/CAMBRIA.hints
@@ -13,6 +13,20 @@ hint.uart.0.ier_rxbits=0x5d	# NB: need UUE+RTOIE
 
 # NB: no UART1 on ixp435
 
+# optional GPS serial port
+hint.uart.1.at="ixp0"
+hint.uart.1.addr=0x53fc0000
+hint.uart.1.irq=20
+hint.uart.1.ier_rxbits=0x1
+hint.uart.1.rclk=1843200
+hint.uart.1.rwdelay=20
+# optional RS485 serial port
+hint.uart.2.at="ixp0"
+hint.uart.2.addr=0x53f80000
+hint.uart.2.irq=21
+hint.uart.2.rclk=1843200
+hint.uart.2.rwdelay=2
+
 # NPE Hardware Queue Manager
 hint.ixpqmgr.0.at="ixp0"