QEMU raspberry emulator setup
Tested on Linux Mint 18 64-Bits
sudo apt-get install qemu
verify that qemu-arm is present (qemu- and double TAB)
Download the LITE image "Minimal image based on Debian Jessie"
https://www.raspberrypi.org/downloads/raspbian/
rename it to rpi.img
https://github.com/dhruvvyas90/qemu-rpi-kernel
you should have the following folder structure
.
├──
├── qemu-rpi-kernel
│ ├── kernel-qemu-3.10.25-wheezy
│ ├── kernel-qemu-4.1.13-jessie
│ ├── kernel-qemu-4.1.7-jessie
│ ├── kernel-qemu-4.4.12-jessie
│ ├── kernel-qemu-4.4.13-jessie
│ ├── kernel-qemu-4.4.21-jessie
│ ├── kernel-qemu-4.4.26-jessie
│ ├── kernel-qemu-4.4.34-jessie
│ ├── README.md
│ └── tools
│ ├── build-kernel-qemu
│ ├── config_file_3.10.25
│ ├── config_ip_tables
│ ├── linux-arm.patch
│ ├── qemu_choose_vm.sh
│ └── README.md
└── rpi.img
Create a new file and name it config
#!/bin/bash
# Starts raspberry pi image in configuration mode
qemu-system-arm -kernel ./qemu-rpi-kernel/kernel-qemu-4.4.13-jessie \
-cpu arm1176 \
-m 256 \
-M versatilepb \
-no-reboot \
-serial stdio \
-append "root=/dev/sda2 panic=1 rootfstype=ext4 rw init=/bin/bash" \
-hda rpi.img
add execution permissions
sudo chmod +x config
./config
Done, you should get the # inside RPI Machine, If QEMU window has captured your mouse, you can release it by pressing LEFT CTRL + LEFT ALT
Mount the image file
fdisk -l ./rpi.img
Device Boot Start End Sectors Size Id Type
rpi.img1 8192 92159 83968 41M c W95 FAT32 (LBA)
rpi.img2 92160 2534887 2442728 1,2G 83 Linux
The filesystem (.img2) starts at sector 92160, which equals 512 * 92160 = 47185920 bytes.
- Use this value in the offset parameter
sudo mkdir /mnt/rpi
sudo mount -v -o offset=47185920 -t ext4 rpi.img /mnt/rpi
- Comment out every entry in ld.so.preload file
cd /mnt/rpi
sudo nano ./etc/ld.so.preload
- Define some rules to tell raspberry pi how to direct calls to SD-Card to the “sda”
sudo nano ./etc/udev/rules.d/90-qemu.rules
KERNEL=="sda", SYMLINK+="mmcblk0"
KERNEL=="sda?", SYMLINK+="mmcblk0p%n"
KERNEL=="sda2", SYMLINK+="root"
-
Umount volume and go back to the working folder
cd ~sudo umount /mnt/rpicd path/to/folder -
Create startup script the config script, change the --append line removing init=/bin/bash
cp config start
nano ./start
#!/bin/bash
# Starts raspberry pi image in configuration mode
qemu-system-arm -kernel ./qemu-rpi-kernel/kernel-qemu-4.4.13-jessie \
-cpu arm1176 \
-m 256 \
-M versatilepb \
-no-reboot \
-serial stdio \
-append "root=/dev/sda2 panic=1 rootfstype=ext4 rw" \
-hda rpi.img
- Run QEMU again, you should get booted into a fully functional emulated Raspberry Pi
./start
- Login
Username: pi Password: raspberry
References:
- dhruvvyas90/qemu-rpi-kernel#31
- https://github.com/dhruvvyas90/qemu-rpi-kernel/wiki/Emulating-Jessie-image-with-4.x.xx-kernel
Basically you need to modify your Raspibian image:
fdisk -l ./rpi.img
Device Boot Start End Sectors Size Id Type
rpi.img1 8192 92159 83968 41M c W95 FAT32 (LBA)
rpi.img2 92160 2534887 2442728 1,2G 83 Linux
The filesystem (.img2) starts at sector 92160, which equals 512 * 92160 = 47185920 bytes.
sudo mkdir /mnt/rpi
sudo mount -v -o offset=47185920 -t ext4 rpi.img /mnt/rpi
cd /mnt/rpi
sudo nano ./etc/ld.so.preload
- Comment out every entry in it, Ctrl-x » Y to save and exit
sudo nano ./etc/fstab
- Comment out entries containing /dev/mmcblk, Ctrl-x » Y to save and exit
cd ~sudo umount /mnt/rpi
Run config script again and get the prompt