add working ARM build
This commit is contained in:
aimran96
commit
12a9341b40
11
README.md
Normal file
11
README.md
Normal file
@ -0,0 +1,11 @@
|
||||
# minimal-linux
|
||||
|
||||
A minimal linux distro cross compiled for ARM with busybox. This works fine but doing the exact same thing with x86_64 doesn't work in the main branch? Don't know whats happening but I presume the startup process is much more complicated for x86_64
|
||||
|
||||
## build from scratch
|
||||
|
||||
`./manual-linux.sh`
|
||||
|
||||
### test with QEMU
|
||||
|
||||
`./start-qemu-terminal.sh`
|
||||
BIN
initramfs.cpio.gz
Normal file
BIN
initramfs.cpio.gz
Normal file
Binary file not shown.
148
manual-linux.sh
Executable file
148
manual-linux.sh
Executable file
@ -0,0 +1,148 @@
|
||||
#!/bin/bash
|
||||
# Script create the simplest linux distro ever
|
||||
|
||||
set -e
|
||||
set -u
|
||||
|
||||
OUTDIR=/tmp/aeld
|
||||
KERNEL_REPO=git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git
|
||||
KERNEL_VERSION=v6.1.14
|
||||
BUSYBOX_VERSION=1_33_1
|
||||
# FINDER_APP_DIR=$(realpath $(dirname $0))
|
||||
ARCH=arm64
|
||||
CROSS_COMPILE=aarch64-none-linux-gnu-
|
||||
|
||||
if [ $# -lt 1 ]
|
||||
then
|
||||
echo "Using default directory ${OUTDIR} for output"
|
||||
else
|
||||
OUTDIR=$1
|
||||
echo "Using passed directory ${OUTDIR} for output"
|
||||
fi
|
||||
|
||||
mkdir -p ${OUTDIR}
|
||||
|
||||
cd "$OUTDIR"
|
||||
if [ ! -d "${OUTDIR}/linux-stable" ]; then
|
||||
#Clone only if the repository does not exist.
|
||||
echo "CLONING GIT LINUX STABLE VERSION ${KERNEL_VERSION} IN ${OUTDIR}"
|
||||
git clone ${KERNEL_REPO} --depth 1 --single-branch --branch ${KERNEL_VERSION}
|
||||
fi
|
||||
if [ ! -e ${OUTDIR}/linux-stable/arch/${ARCH}/boot/Image ]; then
|
||||
cd linux-stable
|
||||
echo "Checking out version ${KERNEL_VERSION}"
|
||||
git checkout ${KERNEL_VERSION}
|
||||
# https://unix.stackexchange.com/questions/657882/how-do-i-cross-compile-the-linux-kernel
|
||||
#make ARCH="$ARCH" CROSS_COMPILE="$CROSS_COMPILE" menuconfig
|
||||
#make ARCH="$ARCH" CROSS_COMPILE="$CROSS_COMPILE" config
|
||||
# use default config
|
||||
# make ARCH="$ARCH" CROSS_COMPILE="$CROSS_COMPILE" defconfig
|
||||
# make ARCH="$ARCH" CROSS_COMPILE="$CROSS_COMPILE"
|
||||
# (deepclean) the kernal Biuld tree - remove any existing configuration
|
||||
make ARCH=${ARCH} CROSS_COMPILE=${CROSS_COMPILE} mrproper
|
||||
# configure our virt device we simulate in qemu
|
||||
echo "(configure our virt)"
|
||||
make ARCH=${ARCH} CROSS_COMPILE=${CROSS_COMPILE} defconfig
|
||||
# biuld a kernel image for booting with qemu
|
||||
echo "biuld a kernel image for booting with qemu"
|
||||
make -j4 ARCH=${ARCH} CROSS_COMPILE=${CROSS_COMPILE} all
|
||||
# build any kernel modules
|
||||
echo "build any kernel modules"
|
||||
make ARCH=arm64 CROSS_COMPILE=${CROSS_COMPILE} modules
|
||||
# build the device tree
|
||||
make ARCH=arm64 CROSS_COMPILE=${CROSS_COMPILE} dtbs
|
||||
fi
|
||||
|
||||
echo "Adding the Image in outdir"
|
||||
|
||||
cp ${OUTDIR}/linux-stable/arch/${ARCH}/boot/Image ${OUTDIR}
|
||||
|
||||
echo "Creating the staging directory for the root filesystem"
|
||||
cd "$OUTDIR"
|
||||
if [ -d "${OUTDIR}/rootfs" ]
|
||||
then
|
||||
echo "Deleting rootfs directory at ${OUTDIR}/rootfs and starting over"
|
||||
sudo rm -rf ${OUTDIR}/rootfs
|
||||
fi
|
||||
|
||||
# TODO: Create necessary base directories
|
||||
mkdir rootfs/
|
||||
mkdir rootfs/bin
|
||||
mkdir rootfs/dev
|
||||
mkdir rootfs/etc
|
||||
mkdir rootfs/home
|
||||
mkdir rootfs/lib
|
||||
mkdir rootfs/lib/modules
|
||||
mkdir rootfs/lib64
|
||||
mkdir rootfs/lib64/modules
|
||||
mkdir rootfs/proc
|
||||
mkdir rootfs/sys
|
||||
mkdir rootfs/sbin
|
||||
mkdir rootfs/tmp
|
||||
mkdir rootfs/usr
|
||||
mkdir rootfs/usr/lib
|
||||
mkdir rootfs/usr/bin
|
||||
mkdir rootfs/usr/sbin
|
||||
mkdir rootfs/var
|
||||
mkdir rootfs/var/log
|
||||
|
||||
cd "$OUTDIR"
|
||||
if [ ! -d "${OUTDIR}/busybox" ]
|
||||
then
|
||||
git clone git://busybox.net/busybox.git
|
||||
cd busybox
|
||||
git checkout ${BUSYBOX_VERSION}
|
||||
# TODO: Configure busybox
|
||||
# https://busybox.net/FAQ.html#configure
|
||||
make ARCH="$ARCH" CROSS_COMPILE="$CROSS_COMPILE" defconfig
|
||||
else
|
||||
cd busybox
|
||||
fi
|
||||
|
||||
# TODO: Make and install busybox
|
||||
make ARCH="$ARCH" CROSS_COMPILE="$CROSS_COMPILE"
|
||||
make ARCH="$ARCH" CROSS_COMPILE="$CROSS_COMPILE" CONFIG_PREFIX="${OUTDIR}/rootfs" install
|
||||
cd ..
|
||||
pwd
|
||||
|
||||
echo "Library dependencies"
|
||||
${CROSS_COMPILE}readelf -a ${OUTDIR}/rootfs/bin/busybox | grep "program interpreter"
|
||||
${CROSS_COMPILE}readelf -a ${OUTDIR}/rootfs/bin/busybox | grep "Shared library"
|
||||
|
||||
# TODO: Add library dependencies to rootfs
|
||||
CROSS_COMPILE_PATH=$(${CROSS_COMPILE}gcc --print-sysroot)
|
||||
cp "${CROSS_COMPILE_PATH}"/lib/ld-linux-aarch64.so.1 "${OUTDIR}"/rootfs/lib
|
||||
cp "${CROSS_COMPILE_PATH}"/lib64/libm.so.6 "${OUTDIR}"/rootfs/lib64
|
||||
cp "${CROSS_COMPILE_PATH}"/lib64/libresolv.so.2 "${OUTDIR}"/rootfs/lib64
|
||||
cp "${CROSS_COMPILE_PATH}"/lib64/libc.so.6 "${OUTDIR}"/rootfs/lib64
|
||||
|
||||
# TODO: Make device nodes
|
||||
cd "$OUTDIR/rootfs"
|
||||
sudo mknod -m 666 dev/null c 1 3
|
||||
sudo mknod -m 600 dev/console c 5 1
|
||||
|
||||
# TODO: Copy scripts and executables to a directory
|
||||
# on the target rootfs
|
||||
|
||||
# embedded apps and ohter installs can go here?
|
||||
|
||||
# cd "$FINDER_APP_DIR"
|
||||
# make clean
|
||||
# make ARCH="$ARCH" CROSS_COMPILE="$CROSS_COMPILE"
|
||||
|
||||
# cp writer ${OUTDIR}/rootfs/home
|
||||
# cp finder.sh ${OUTDIR}/rootfs/home
|
||||
# cp finder-test.sh ${OUTDIR}/rootfs/home
|
||||
# cp writer.sh ${OUTDIR}/rootfs/home
|
||||
# mkdir ${OUTDIR}/rootfs/home/conf
|
||||
# cp -r conf/. ${OUTDIR}/rootfs/home/conf
|
||||
# cp autorun-qemu.sh ${OUTDIR}/rootfs/home
|
||||
|
||||
# TODO: Chown the root directory
|
||||
cd "$OUTDIR/rootfs"
|
||||
sudo chown -R root:root *
|
||||
|
||||
# TODO: Create initramfs.cpio.gz
|
||||
find . | cpio -H newc -ov --owner root:root > ${OUTDIR}/initramfs.cpio
|
||||
cd "$OUTDIR"
|
||||
gzip -f initramfs.cpio
|
||||
32
start-qemu-terminal.sh
Executable file
32
start-qemu-terminal.sh
Executable file
@ -0,0 +1,32 @@
|
||||
# !/bin/bash
|
||||
# Script to open qemu terminal.
|
||||
# Author: Siddhant Jajoo.
|
||||
|
||||
set -e
|
||||
|
||||
OUTDIR=$1
|
||||
|
||||
if [ -z "${OUTDIR}" ]; then
|
||||
OUTDIR=/tmp/aeld
|
||||
echo "No outdir specified, using ${OUTDIR}"
|
||||
fi
|
||||
|
||||
KERNEL_IMAGE=${OUTDIR}/Image
|
||||
INITRD_IMAGE=${OUTDIR}/initramfs.cpio.gz
|
||||
|
||||
if [ ! -e ${KERNEL_IMAGE} ]; then
|
||||
echo "Missing kernel image at ${KERNEL_IMAGE}"
|
||||
exit 1
|
||||
fi
|
||||
if [ ! -e ${INITRD_IMAGE} ]; then
|
||||
echo "Missing initrd image at ${INITRD_IMAGE}"
|
||||
exit 1
|
||||
fi
|
||||
|
||||
|
||||
echo "Booting the kernel"
|
||||
# See trick at https://superuser.com/a/1412150 to route serial port output to file
|
||||
qemu-system-aarch64 -m 256M -M virt -cpu cortex-a53 -nographic -smp 1 -kernel ${KERNEL_IMAGE} \
|
||||
-chardev stdio,id=char0,mux=on,logfile=${OUTDIR}/serial.log,signal=off \
|
||||
-serial chardev:char0 -mon chardev=char0\
|
||||
-append "rdinit=/bin/sh" -initrd ${INITRD_IMAGE}
|
||||
Loading…
x
Reference in New Issue
Block a user