build_mdio: add script for building userspace binary of mdio tool

kernel-module has to be build separately with passing kernel source

in kernel-dir of mdio-tool working copy:
KDIR=/media/data_ext/git/kernel/BPI-Router-Linux ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- make all

Author: frank-w

build_mdio.sh

@@ -0,0 +1,31 @@
+#!/bin/bash
+
+# mdio-tools need kernel-module built before
+# first build kernel itself to have necesary files there
+# cd kernel/; KDIR=kernel-dir ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- make all
+
+# copy script in the root-filesystem "cp build_mdio.sh $rootdir/root/"
+# chroot $rootdir /root/build_mdio.sh
+
+if [ "$(stat -c %d:%i /)" != "$(stat -c %d:%i /proc/1/root/. 2>/dev/null)" ]; then
+	echo "We are chrooted! continue building..."
+
+	apt update
+	apt -y install git gcc make
+	apt install autoconf pkg-config libmnl0 libmnl-dev file
+	cd /usr/src
+	git clone https://github.com/wkz/mdio-tools.git
+	cd mdio-tools/
+	./autogen.sh
+	#make
+	PRFX=$(pwd)/install
+	#make PREFIX=$PRFX SBINDIR=$PRFX/sbin install
+	LDFLAGS=-static ./configure --prefix=$PRFX/usr && make all && make install
+	#./configure --prefix=$PRFX/usr && make all && sudo make install
+	#file  src/mdio/mdio
+	cd $PRFX
+	tar -czf ../mdio-tools.tar.gz .
+	tar -tzf ../mdio-tools.tar.gz
+else
+  echo "no chroot...exiting..."
+fi