odroidxu4: wait for ethernet to become available before proceeding with init scripts

board/bananapi/overlay/etc/init.d/boardsn

@@ -1,5 +1,5 @@
 #!/bin/bash
 
-sn=$(cat /sys/class/net/eth0/address | tr -d ':')
+sn=$(cat /sys/class/net/eth0/address 2>/dev/null| tr -d ':')
 echo ${sn: -8}
 

board/cubietruck/overlay/etc/init.d/boardsn

@@ -1,5 +1,5 @@
 #!/bin/bash
 
-sn=$(cat /sys/class/net/eth0/address | tr -d ':')
+sn=$(cat /sys/class/net/eth0/address 2>/dev/null| tr -d ':')
 echo ${sn: -8}
 

board/odroidc1/overlay/etc/init.d/boardsn

@@ -1,5 +1,5 @@
 #!/bin/bash
 
-sn=$(cat /sys/class/net/eth0/address | tr -d ':')
+sn=$(cat /sys/class/net/eth0/address 2>/dev/null | tr -d ':')
 echo ${sn: -8}
 

board/odroidxu4/overlay/etc/init.d/S02waiteth

@@ -0,0 +1,20 @@
+#!/bin/bash
+
+test -n "$os_version" || source /etc/init.d/base
+
+case "$1" in
+    start)
+        sleep 2
+        ;;
+
+    stop)
+        true
+        ;;
+
+    *)
+        echo "Usage: $0 {start}"
+        exit 1
+esac
+
+exit $?
+

board/odroidxu4/overlay/etc/init.d/boardsn

@@ -1,5 +1,5 @@
 #!/bin/bash
 
-sn=$(cat /sys/class/net/eth0/address | tr -d ':')
+sn=$(cat /sys/class/net/eth0/address 2>/dev/null | tr -d ':')
 echo ${sn: -8}
 

board/odroidxu4/overlay/etc/modules

@@ -0,0 +1,2 @@
+r8152
+