https://github.com/vfdev-5/qemu-rpi2-vexpress
QEMU emulation ARMv7
https://github.com/vfdev-5/qemu-rpi2-vexpress
armv7 qemu-emulator raspberry-pi rpi
Last synced: 5 months ago
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QEMU emulation ARMv7
- Host: GitHub
- URL: https://github.com/vfdev-5/qemu-rpi2-vexpress
- Owner: vfdev-5
- Created: 2016-09-25T23:44:10.000Z (about 9 years ago)
- Default Branch: master
- Last Pushed: 2018-10-12T15:13:32.000Z (almost 7 years ago)
- Last Synced: 2025-03-30T22:32:22.097Z (6 months ago)
- Topics: armv7, qemu-emulator, raspberry-pi, rpi
- Language: Shell
- Size: 3.55 MB
- Stars: 24
- Watchers: 5
- Forks: 3
- Open Issues: 1
-
Metadata Files:
- Readme: README.md
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README
# Start Raspberry Pi 2 image in QEMU
In this project you can find some scripts to launch QEMU on image from SD card of Raspberry Pi 2 (rpi2) as ARMv7 (vexpress-a9 or vexpress-a15).
*For example, you can dump [Ubuntu Mate 16.04 armhf](https://ubuntu-mate.org/raspberry-pi/ubuntu-mate-16.04-desktop-armhf-raspberry-pi.img.xz) to an SD card and start it in QEMU emulator*
This project is similar to [qemu-rpi-kernel](https://github.com/dhruvvyas90/qemu-rpi-kernel/) where `versatilepb` machine used in QEMU (equivalent to ARMv6).
## QEMU installation:
You need to use `qemu-system-arm`, to install qemu execute the following :
```
sudo apt-get install qemu
```
## Usage :
**Important: Certain files on the SD card image are modified in order to start emulation in QEMU.**
- Insert micro SD and findout its device file. For example, device root file is `/dev/sdb`
- in terminal start command :
```
bash start.bash /dev/sdb [--no-verbose]
```
### Image modifications for QEMU:
QEMU emulation requires modification in /etc/fstab and /etc/ld.so.preload files
For more details, see, for example, [here](http://stackoverflow.com/questions/38837606/emulate-raspberry-pi-raspbian-with-qemu/39676138) or [here](http://blog.3mdeb.com/2015/12/30/emulate-rapberry-pi-2-in-qemu/) or even [here](https://github.com/dhruvvyas90/qemu-rpi-kernel/blob/master/tools/qemu_choose_vm.sh)
Thus, `start.bash` script mounts the device to access its system files, copies original `/etc/fstab` and `/etc/ld.so.preload` and comments the lines:
```
/dev/mmcblk0p2 / ext4 defaults,noatime 0 1
/dev/mmcblk0p1 /boot/ vfat defaults 0 2
```
and
```
/usr/lib/arm-linux-gnueabihf/libarmmem.so
```
## Details :
The command to launch QEMU emulator on `/dev/sdb` is
```
sudo qemu-system-arm -m 2048M -M vexpress-a15 -cpu cortex-a15 -kernel kernel-qemu-4.4.1-vexpress -no-reboot -dtb vexpress-v2p-ca15_a7.dtb -sd /dev/sdb -append "root=/dev/mmcblk0p2 rw rootfstype=ext4"
```
#### Linux kernel 4.4.1 and DTB
Linux kernel used with QEMU is a build of [Linux 4.4.1](https://cdn.kernel.org/pub/linux/kernel/v4.x/linux-4.4.1.tar.xz) configured on `vexpress` :
```
$ cd linux-4.4.1
$ make ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- vexpress_defconfig
$ cat >> .config << EOF
> CONFIG_FHANDLE=y
> CONFIG_LBDAF=y
> EOF
$ make -j4 ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- all
...
$ cp arch/arm/boot/zImage ../kernel-qemu-4.4.1-vexpress
$ cp arch/arm/boot/dts/vexpress-*.dtb ../
```
See [download_and_compile_kernel.bash](download_and_compile_kernel.bash) for more details.