Enable the AR8316 switch on the routerstation pro board.

The configuration is:

* RGMII, both ports
* arge0 - connected to PHY4 as a dedicated port (CPU port)
* arge1 - connected to the switch ports

I've verified this on my routerstation pro board.

sys/mips/conf/RSPRO

@@ -21,6 +21,12 @@ options		GEOM_PART_BSD
 options		GEOM_PART_MBR
 options		MSDOSFS
 
+# For etherswitch support
+options		ARGE_MDIO
+device		miiproxy
+device		etherswitch
+device		arswitch
+
 # Boot off of flash
 options		ROOTDEVNAME=\"ufs:redboot/rootfs.uzip\"
 

sys/mips/conf/RSPRO.hints

@@ -1,10 +1,27 @@
 # $FreeBSD$
 
-hint.arge.0.phymask=0x10
+# arge0 mdio bus
+hint.argemdio.0.at="nexus0"
+hint.argemdio.0.maddr=0x19000000
+hint.argemdio.0.msize=0x1000
+hint.argemdio.0.order=0
 
-hint.arge.1.media=1000
-hint.arge.1.fduplex=1
-hint.arge.1.phymask=0x0e
+# arge0: dedicated switch port
+hint.arge.0.phymask=0x10	# PHY4
+hint.arge.0.miimode=3		# RGMII
+hint.arge.0.mdio=mdioproxy1	# .. off of the switch mdiobus
+
+# arge1: nail to 1000/full, RGMII - connected to the switch
+hint.arge.1.media=1000		# Map to 1000/full
+hint.arge.1.fduplex=1		#
+hint.arge.1.phymask=0x0		# no directly mapped PHYs
+hint.arge.1.miimode=3		# RGMII
+
+hint.arswitch.0.is_7240=0
+hint.arswitch.0.numphys=4
+hint.arswitch.0.phy4cpu=1
+hint.arswitch.0.is_rgmii=1
+hint.arswitch.0.is_gmii=0
 
 # Don't flip on anything that isn't already enabled.
 # This includes leaving the SPI CS1/CS2 pins as GPIO pins as they're