u-boot arm64 from QEMU

#!/bin/bash
PREFIX="aarch64-linux-gnu-"
arch="arm64"
TOP=`pwd`

UBOOT_SRC_URL="https://ftp.denx.de/pub/u-boot/u-boot-2018.11.tar.bz2"
TOOLCHAIN_SRC_URL="http://releases.linaro.org/components/toolchain/binaries/6.5-2018.12/aarch64-linux-gnu/gcc-linaro-6.5.0-2018.12-x86_64_aarch64-linux-gnu.tar.xz"
BUSYBOX_SRC_URL="http://busybox.net/downloads/busybox-1.23.2.tar.bz2"
KERNEL_SRC_URL="https://www.kernel.org/pub/linux/kernel/v4.x/linux-4.4.8.tar.xz"

UBOOT_DIR="uboot_src"
TOOLCHAIN_DIR="toolchain_src"
BUSYBOX_DIR="busybox_src"
KERNEL_DIR="linux_src"

TOOLCHAIN_PATH="$TOP/$TOOLCHAIN_DIR/bin"

BUSYBOX_PALTFORM="busybox-$arch"
LINUX_PALTFORM="linux-$arch-basic"



download_src(){
if [ -d "$1" ]; then
echo "The $1 has been downloaded"
else
mkdir "$1"
wget -P /tmp/ "$2" && tar $3 "/tmp/`basename $2`" -C "$1" --strip-components=1
fi
}

toolchain() {
download_src $TOOLCHAIN_DIR $TOOLCHAIN_SRC_URL xJf
export PATH=${PATH}:${TOOLCHAIN_PATH}
export ARCH=$arch
export CROSS_COMPILE=$PREFIX
}


uboot() {
download_src $UBOOT_DIR $UBOOT_SRC_URL jxvf
toolchain;
cd "$UBOOT_DIR"
make qemu_arm64_defconfig
make -j4
}


busybox() {
download_src $BUSYBOX_DIR $BUSYBOX_SRC_URL xjf
toolchain;
mkdir -pv $TOP/initramfs
mkdir -pv $TOP/obj/$BUSYBOX_PALTFORM

cd "$BUSYBOX_DIR"
    make mrproper
    make O=$TOP/obj/$BUSYBOX_PALTFORM defconfig
sed -i 's/.*CONFIG_STATIC.*/CONFIG_STATIC=y/' $TOP/obj/$BUSYBOX_PALTFORM/.config
sed -i 's/.*CONFIG_INSTALL_NO_USR.*/CONFIG_INSTALL_NO_USR=y/' $TOP/obj/$BUSYBOX_PALTFORM/.config
sed -i 's/.*CONFIG_FEATURE_PREFER_APPLETS.*/CONFIG_FEATURE_PREFER_APPLETS=y/' $TOP/obj/$BUSYBOX_PALTFORM/.config
sed -i 's/.*CONFIG_FEATURE_SH_STANDALONE.*/CONFIG_FEATURE_SH_STANDALONE=y/' $TOP/obj/$BUSYBOX_PALTFORM/.config
    make clean
    make O=$TOP/obj/$BUSYBOX_PALTFORM -j12 2>&1 | tee  ../busybox_build.log
    make O=$TOP/obj/$BUSYBOX_PALTFORM install

# initramfs
cd $TOP/initramfs
mkdir -pv {bin,sbin,etc/init.d,proc,sys,dev,lib,usr/{bin,sbin}}
cp -av $TOP/obj/$BUSYBOX_PALTFORM/_install/* .

cd dev
sudo mknod -m 660 null c 1 3
sudo mknod -m 622 console c 5 1
sudo mknod -m 622 tty0 c 4 0
ln -sf null tty2
ln -sf null tty3
ln -sf null tty4
cd ..
    #cp -a $TOP/toolchain_src/arm-linux-gnueabihf/libc/* lib

#don't have any space or tab when use EOF to output file
cat << EOF > etc/init.d/rcS
#!/bin/sh
mount -t proc none /proc
mount -t sysfs none /sys
echo -e "\nBoot took $(cut -d" " -f1 /proc/uptime) seconds\n"
EOF

    chmod 755 etc/init.d/rcS
    find . -print0 \
        | cpio --null -ov --format=newc \
        | gzip -9 > $TOP/obj/$BUSYBOX_PALTFORM/initramfs-"$BUSYBOX_PALTFORM".cpio.gz
}

initramfs() {
    TOP=`pwd`
    cd $TOP/initramfs/"$BUSYBOX_PALTFORM"

    #find ./ | cpio -o -H newc | gzip > $TOP/obj/initramfs-$BUSYBOX_PALTFORM.cpio.gz

    find . -print0 \
    | cpio --null -ov --format=newc \
    | gzip -9 > $TOP/obj/BUSYBOX_PALTFORM/initramfs-"$BUSYBOX_PALTFORM".cpio.gz
}

kernel() {
download_src $KERNEL_DIR $KERNEL_SRC_URL xJf
toolchain;
# build kernel
cd $TOP
    mkdir -pv obj/"$LINUX_PALTFORM"
    make -C $KERNEL_DIR O=../obj/$LINUX_PALTFORM mrproper
    make  -C $KERNEL_DIR O=../obj/$LINUX_PALTFORM  defconfig
    sed -i 's/.*CONFIG_EXPERIMENTAL.*/CONFIG_EXPERIMENTAL=y/' ../obj/$LINUX_PALTFORM/.config
sed -i 's/.*CONFIG_DEBUG_INFO.*/CONFIG_DEBUG_INFO=y/' ../obj/$LINUX_PALTFORM/.config
sed -i 's/.*CONFIG_KGDB.*/CONFIG_KGDB=y/' ../obj/$LINUX_PALTFORM/.config
sed -i 's/.*CONFIG_KGDB_LOW_LEVEL_TRAP.*/CONFIG_KGDB_LOW_LEVEL_TRAP=y/' ../obj/$LINUX_PALTFORM/.config
sed -i 's/.*CONFIG_FRAME_POINTER.*/CONFIG_FRAME_POINTER=y/' ../obj/$LINUX_PALTFORM/.config
sed -i 's/.*CONFIG_MAGIC_SYSRQ.*/CONFIG_MAGIC_SYSRQ=y/' ../obj/$LINUX_PALTFORM/.config
sed -i 's/.*CONFIG_8139CP.*/CONFIG_8139CP=y/' ../obj/$LINUX_PALTFORM/.config
sed -i 's/.*CONFIG_DEBUG_SET_MODULE_RONX.*/CONFIG_DEBUG_SET_MODULE_RONX=n/' obj/$LINUX_PALTFORM/.config
sed -i 's/.*CONFIG_DEBUG_RODATA.*/CONFIG_DEBUG_RODATA=n/' ../obj/$LINUX_PALTFORM/.config
sed -i 's/.*CONFIG_MODULE_FORCE_LOAD.*/CONFIG_MODULE_FORCE_LOAD=y/' ../obj/$LINUX_PALTFORM/.config
sed -i 's/.*CONFIG_MODULE_UNLOAD.*/CONFIG_MODULE_UNLOAD=y/' ../obj/$LINUX_PALTFORM/.config
sed -i 's/.*CONFIG_MODULE_FORCE_UNLOAD.*/CONFIG_MODULE_FORCE_UNLOAD=y/' ../obj/$LINUX_PALTFORM/.config

cat << EOF >> ../obj/"$LINUX_PALTFORM"/.config
CONFIG_KPROBES_ON_FTRACE=y
CONFIG_UPROBES=y
CONFIG_TRACE_IRQFLAGS=y
CONFIG_TRACER_MAX_TRACE=y
CONFIG_RING_BUFFER_ALLOW_SWAP=y
CONFIG_FTRACE=y
CONFIG_FUNCTION_TRACER=y
CONFIG_FUNCTION_GRAPH_TRACER=y
CONFIG_IRQSOFF_TRACER=y
CONFIG_SCHED_TRACER=y
CONFIG_FTRACE_SYSCALLS=y
CONFIG_TRACER_SNAPSHOT=y
CONFIG_TRACER_SNAPSHOT_PER_CPU_SWAP=y
CONFIG_STACK_TRACER=y
CONFIG_UPROBE_EVENT=y
CONFIG_DYNAMIC_FTRACE=y
CONFIG_DYNAMIC_FTRACE_WITH_REGS=y
CONFIG_FUNCTION_PROFILER=y
CONFIG_FTRACE_MCOUNT_RECORD=y
CONFIG_FTRACE_SELFTEST=y
CONFIG_FTRACE_STARTUP_TEST=y
CONFIG_EVENT_TRACE_TEST_SYSCALLS=y
CONFIG_MMIOTRACE=y
CONFIG_PERCPU_RWSEM=y
EOF

yes '' | make -C $KERNEL_DIR O=../obj/$LINUX_PALTFORM oldconfig
make -C $KERNEL_DIR O=../obj/$LINUX_PALTFORM clean
time make -C $KERNEL_DIR O=../obj/$LINUX_PALTFORM -j12 2>&1 | tee kernel_build.log
}


qemu() {
    qemu-system-aarch64 -machine virt -cpu cortex-a53 -nographic -m 2048 \
    -kernel obj/"$LINUX_PALTFORM"/arch/arm64/boot/Image \
    -initrd obj/$BUSYBOX_PALTFORM/initramfs-"$BUSYBOX_PALTFORM".cpio.gz \
    -append "root=/dev/ram rdinit=/sbin/init console=ttyAMA0,115200"
}



initramfs() {
    cd $TOP/initramfs/"$BUSYBOX_PALTFORM"

    #find ./ | cpio -o -H newc | gzip > $TOP/obj/initramfs-$BUSYBOX_PALTFORM.cpio.gz

    find . -print0 \
    | cpio --null -ov --format=newc \
    | gzip -9 > $TOP/obj/$BUSYBOX_PALTFORM/initramfs-"$BUSYBOX_PALTFORM".cpio.gz
}

while true; do
    case "$1" in
-t|--toolchain) toolchain; exit 0;;
-u|--uboot) uboot; exit 0;;
-b|--busybox) busybox; exit 0;;
-i|--initramfs) initramfs; exit 0;;
-k|--kernel) kernel; exit 0;;
        -r|--run) qemu; exit 0;;
        --) shift; break;;
    esac
    shift
done