Script to run an rpi image on QEMU

qemu_rpi.sh

#!/bin/sh

# This script follows the instructions found in https://github.com/dhruvvyas90/qemu-rpi-kernel

QEMU=`which qemu-system-arm`
BASE_DIR=.
RPI_KERNEL=${BASE_DIR}/kernel-qemu-5.4.51-buster
RPI_DTB=${BASE_DIR}/versatile-pb-buster.dtb
IMAGE_BASE=2020-08-20-raspios-buster-armhf-lite
IMAGE=${IMAGE_BASE}.img

mkdir -p $BASE_DIR; cd $BASE_DIR

if [ ! -f ${RPI_KERNEL} ]; then
    wget https://github.com/dhruvvyas90/qemu-rpi-kernel/blob/master/${RPI_KERNEL}?raw=true \
            -O ${RPI_KERNEL}
fi

if [ ! -f ${RPI_DTB} ]; then
    wget https://github.com/dhruvvyas90/qemu-rpi-kernel/blob/master/${RPI_DTB}?raw=true \
            -O ${RPI_DTB}
fi

if [ ! -f ${IMAGE} ]; then
    wget https://downloads.raspberrypi.org/raspios_lite_armhf/images/raspios_lite_armhf-2020-08-24/${IMAGE_BASE}.zip
    unzip $IMAGE_BASE.zip
fi

# create 2 GIB SD card
if [ ! -f  ${BASE_DIR}/rpi.img ]; then
    cat $RPI_FS /dev/zero | dd bs=4096 count=524288 > ${BASE_DIR}/rpi.img
fi

if [ "$1" = "run" ]; then
    $QEMU -kernel ${RPI_KERNEL} \
    -cpu arm1176 -m 256M \
    -M versatilepb \
    -dtb ${RPI_DTB} \
    -append "root=/dev/vda2 panic=1" \
    -drive "file=${BASE_DIR}/rpi.img,if=none,index=0,media=disk,format=raw,id=disk0" \
    -device "virtio-blk-pci,drive=disk0,disable-modern=on,disable-legacy=off" \
    -no-reboot \
    -serial stdio
    
elif [ "$1" = "mount" ]; then
    sudo mkdir -p /mnt/rpi/img1
    sudo mkdir -p /mnt/rpi/img2
    sudo kpartx -a ${BASE_DIR}/rpi.img
    sudo mount /dev/mapper/loop0p2 /mnt/rpi/img1 -o loop,rw
    sudo mount /dev/mapper/loop0p2 /mnt/rpi/img2 -o loop,rw
    echo "mounted at:"
    echo "    /mnt/rpi/img1"
    echo "    /mnt/rpi/img2"
elif [ "$1" = "umount" ]; then
    sudo umount /mnt/rpi/img1
    sudo umount /mnt/rpi/img2
    sudo kpartx -d ${BASE_DIR}/rpi.img
    sudo rmdir /mnt/rpi/img1
    sudo rmdir /mnt/rpi/img2
else
    echo "usage: qemu_script.sh <command>"
    echo ""
    echo "commands:"
    echo "run - starts qemu"
    echo "mount - mounts the image partitions"
    echo "unmount - unmounts the image partitions"
fi