brcm47xx: improve cpuport detection for filesafe

Do not try to load bcm57xx.ko any more this is not needed for kernel 2.6 and 3.X
Ask the switch driver where the CPU port is.

SVN-Revision: 35624

target/linux/brcm47xx/base-files/lib/preinit/05_init_interfaces_brcm

@@ -14,7 +14,6 @@ set_preinit_iface() {
 	# hardware specific overrides
 	case "$(cat /proc/diag/model)" in
 		"Linksys WAP54G V1") ifname=eth1;;
-		"Linksys E3000 V1"|"Linksys WRT610N V2") cpu_port="8u*";;
 		"ASUS WL-HDD") ifname=eth1;;
 		"ASUS WL-300g") ifname=eth1;;
 		"ASUS (unknown, BCM4702)") ifname=eth1;;
@@ -23,20 +22,17 @@ set_preinit_iface() {
 	ifconfig $ifname 0.0.0.0 up
 }
 
-check_module () {
-  module="$1"; shift; params="$*"
-
-  insmod "$module" "$params"
-  sleep 1
-  grep -q ^"$module " /proc/modules
-  return $?
-}
-
 init_iface() {
 	insmod switch-core
-	check_module switch-robo || check_module switch-adm  || {
-	  check_module bcm57xx activate_gpio=0x4 && cpu_port="8u*"
-	} || rmmod switch-core
+	insmod switch-robo
+	insmod switch-adm
+
+	[ -d /proc/switch/eth0 ] && [ "$ifname" = "eth0" ] && {
+		case "$(cat /proc/switch/eth0/cpuport)" in
+			"5") cpu_port="5u*";;
+			"8") cpu_port="8u*";;
+		esac
+	}
 }
 
 boot_hook_add preinit_main set_preinit_iface