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Emulating the Olimex Board

This guide shows how to emulate the Olimex Linux image on your Intel based PC. It is based on this forum entry.

Basically, we use the qemu-user-static emulator to emulate ARM binaries on our native kernel, and use systemd-nspawn to execute the image like a container.

Prerequisites

On Debian systems, install the following tools:

apt install qemu-user-static systemd-container

On Fedora, use these:

dnf install qemu-user-static systemd-container

Running the system

You need to have the A20 Debian image extracted somewhere in your filesystem. This means you either extracted it from the image file, you mounted the image file, or you have already written it onto a microSD card and mounted that on your system. As an example, we have extracted the whole image into /tmp/olimex.

All that's left is to execute the following command as root:

systemd-nspawn --bind=/dev/ttyACM0 -b -D /tmp/olimex

Explanations of the parameters:

  • --bind=/dev/ttyACM0 exposes your host system serial device /dev/ttyACM0 into the chrooted A20 environment. This serial device is used in opensesame to read the sensor data.

  • -b advices systemd to act like it's booting the image, so it will run the init executable of the chrooted environment.

  • -D specifies the root directory of the A20 image. Alternatively, you can use -i to specify the image directly, so you don't need to extract the contents of it.

Use the credentials of the image (default root/olimex) to login and work on the system.

If you need network connectivity, you need to configure DNS lookup with the following command:

echo 'nameserver 8.8.8.8' >  /run/resolvconf/resolv.conf

You need to do this every time you start the container, as anything under /run does not get persisted.

If you want to connect into this container via SSH, you need to modify the port in /etc/sshd/sshd_config to another port, as port 22 is most likely already used by your host system.