Added some scripts for creating the environment

compilekernel.sh

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+#!/bin/bash
+cd ..
+cd linux
+make mrproper
+make ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- defconfig
+cp ../rpi23-gen-image/working-rpi3-linux-config.txt .config
+make -j2 ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu-

getbootloader.sh

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+#!/bin/bash
+cd ..
+git clone git://git.denx.de/u-boot.git
+cd u-boot
+git checkout b24cf8540a85a9bf97975aadd6a7542f166c78a3

getdependencies.sh

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+#!/bin/bash
+apt-get install apt-cacher-ng
+apt-get install debootstrap debian-archive-keyring qemu-user-static binfmt-support dosfstools rsync bmap-tools whois git bc device-tree-compiler crossbuild-essential-armhf crossbuild-essential-arm64

getfirmware.sh

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+#!/bin/bash
+cd ..
+mkdir -p raspberry-firmware/boot
+cd raspberry-firmware/boot
+wget https://github.com/raspberrypi/firmware/raw/master/boot/bootcode.bin
+wget https://github.com/raspberrypi/firmware/raw/master/boot/fixup_cd.dat
+wget https://github.com/raspberrypi/firmware/raw/master/boot/fixup.dat
+wget https://github.com/raspberrypi/firmware/raw/master/boot/fixup_x.dat
+wget https://github.com/raspberrypi/firmware/raw/master/boot/start_cd.elf
+wget https://github.com/raspberrypi/firmware/raw/master/boot/start.elf
+wget https://github.com/raspberrypi/firmware/raw/master/boot/start_x.elf

getkernel.sh

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+#!/bin/bash
+cd ..
+git clone https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
+cd linux
+git checkout 60e8d3e11645a1b9c4197d9786df3894332c1685

getrpi23.sh

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+#!/bin/bash
+git clone https://github.com/michaelfranzl/rpi23-gen-image.git