diff --git a/target/linux/rdc/base-files/etc/preinit.arch b/target/linux/rdc/base-files/etc/preinit.arch
index 8f21b1f9ed7..fd456f8b232 100644
--- a/target/linux/rdc/base-files/etc/preinit.arch
+++ b/target/linux/rdc/base-files/etc/preinit.arch
@@ -1,8 +1,23 @@
-# Copyright (C) 2008 OpenWrt.org
+# Copyright (C) 2009 OpenWrt.org
 
-ash -c ". /etc/functions.sh
-hdr=\$(find_mtd_part productinfo)
-[ \$(find_mtd_part productinfo_parthdr) ] || rev=reverse
-[ \"\$hdr\" ] && mac=\$(hexdump -n 6 -e '6/1 \",0x%X\"' \$hdr |cut -c2-)
-[ \"\$mac\" = \"0x0,0x0,0x0,0x0,0x0,0x0\" ] && unset mac
-[ \"\$mac\" ] && insmod r6040 \$rev mac_base=\$mac"
+. /etc/functions.sh
+
+insmod r6040
+
+kernel=$(grep magic /proc/mtd | awk -F: '{print $1}')
+[ -n $kernel ] && hdr=$(dd if=/dev/$kernel count=4 bs=1 2> /dev/null)
+[ "$hdr" = "CSYS" ] && config=$(find_mtd_part config)
+if [ -n "$config" ]; then
+	mac0=$(hexdump -n 6 -e '6/1 ":%X"' -s 24583 $config | cut -c2-)
+	[ "$mac0" = "FF:FF:FF:FF:FF:FF" -o "$mac0" = "0:0:0:0:0:0" ] && unset mac0
+	mac1=$(hexdump -n 6 -e '6/1 ":%X"' -s 24589 $config | cut -c2-)
+	[ "$mac1" = "FF:FF:FF:FF:FF:FF" -o "$mac0" = "0:0:0:0:0:0" ] && unset mac1
+fi
+if [ -n $mac0 ]; then
+	logger -t kernel -p user.info "r6040: Setting MAC for eth0 to $mac0"
+	ifconfig eth0 hw ether $mac0
+fi
+if [ -n $mac1 ]; then
+	logger -t kernel -p user.info "r6040: Setting MAC for eth1 to $mac1"
+	ifconfig eth1 hw ether $mac1
+fi