Release Notes for HelenOS 0.9.1

HelenOS 0.9.1 (Armonia) was released on May 11, 2019.

This document contains a summary of changes made to HelenOS since release 0.8.0.

Special Notes for this Release

This release brings support for a new 64-bit architecture and improves usability of HelenOS on several already supported platforms. It also extends support for dynamic linking to more architectures.

This release brings a small change in the version numbering scheme. Since there are two releases per year, the first one is 0.<YEAR-2010>.1 and the second one is 0.<YEAR-2010>.2. Note that the agile bi-annual release cycle might produce releases that are slightly less "polished" in certain aspects, but it is also a driving force towards turning HelenOS into a production-ready operating system in the near future.


  • Dynamic linking is now supported and enabled by default on amd64, arm32, ppc32 and sparc64 (in addition to previous support on ia32)
  • Support for the MIPS Malta machine was improved by enabling serial console input/output both in the kernel console and also for the user interface.
  • Support for arm64 architecture (AArch64) was added. The port can run on the QEMU ARM Virtual Machine.


  • Support for serial console on the sparc64/sun4u machine was improved by enabling it in the kernel in addition to the already enabled support in the user interface.

Services and Drivers

  • New specialized utility pci for listing PCI devices
    • Plus corresponding backend support in the PCI driver
  • Added driver for virtio-blk block devices. Use -hdd virtio-blk to enable in QEMU. So far this works only on ia32 and amd64.

Fixed Logged Bugs & Enhancements

  • For the list of all logged defects fixed in this release, see this report.
  • For the list of all logged enhancements integrated in this release, see this report.

Known Bugs

  • For the list of known bugs still not fixed in this release, see this report.
  • For the list of all open tickets, see this report.
Last modified 5 years ago Last modified on 2019-05-11T19:58:30Z
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