'Hello world' in Micropython in a 64-bit RISC-V BusyBox Linux guest on the Diosix hypervisor

by diosix 3 years ago

GNU/Linux ◆ xterm-256color ◆ zsh 2127 views

This is a demonstration of printing ‘hello world!’ using Micropython in a 64-bit RISC-V Linux guest OS on the bare-metal Diosix hypervisor. The command just seen in the term does the following:

The hypervisor and its system services are built, a Linux guest binary is located, and all these components are packaged up in a simple file-system image ready to boot.
The hypervisor is started inside Qemu, it initializes the emulated hardware – a quad-core 1GB system – and loads a system service that handles the console interface.
The hypervisor then loads the Linux guest OS into its virtualized environment, called a capsule, and starts it.
Linux boots as if it were on real hardware, and eventually gets to a login prompt.
Via the console system service, the user can log in and interact with a BusyBox-based environment. The zsh shell is provided.
The guest kernel build and version info can be displayed using the uname -a command, and a list of the root directory using ls -l /.
The user can run micropython and print ‘hello world!’ from the interpreter.
After exiting Micropython, the user can shutdown the guest using the command poweroff.

You can download this recording in asciicast v2 format, as a .cast file.

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asciinema play 395307.cast

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Download asciinema player from the releases page (you only need .js and .css file), then use it like this:

<!DOCTYPE html>
<html>
<head>
  <link rel="stylesheet" type="text/css" href="asciinema-player.css" />
</head>
<body>
  <div id="player"></div>
  <script src="asciinema-player.min.js"></script>
  <script>
    AsciinemaPlayer.create(
      '/assets/395307.cast',
      document.getElementById('player'),
      { cols: 219, rows: 46 }
    );
  </script>
</body>
</html>

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While this site doesn't provide GIF conversion at the moment, you can still do it yourself with the help of asciinema GIF generator utility - agg.

Once you have it installed, generate a GIF with the following command:

agg https://asciinema.org/a/395307 demo.gif

Or, if you already downloaded the recording file:

agg demo.cast demo.gif

Check agg --help for all available options. You can change font family and size, select color theme, adjust speed and more.

See agg manual for full usage instructions.