ReconOS has been actively developed since its inception in 2006. Since then it has gone through four major revisions and has been ported to several operating systems and hardware platforms.

Major Revisions of ReconOS

Version 1

ReconOS v1.0 was the very first version developed by Enno Lübbers within his PhD-Thesis and published in Enno Lübbers and Marco Platzner. ReconOS: An RTOS supporting Hard- and Software Threads. It used the eCos operating system running on PowerPC CPUs embedded in Xilinx Virtex-2 Pro and Virtex-4 FPGAs.

Version 2

ReconOS v2.0 improved on the original version by providing FIFO interconnects between hardware threads, adding support for the Linux operating system, and offering a common virtual address space between hardware and software threads.

Version 3

ReconOS v3.0, which was released in early 2013, is a major overhaul that streamlines the hardware architecture towards a more lightweight and modular design. It brings ReconOS to the Microblaze/Linux and Microblaze/Xilkernel architectures and has been used extensively on Virtex-6 FPGAs. ReconOS v3.1 switches from the old PLB-Bus to a new AXI based architecture and supports the Xilinx Zynq platform.

Version 4

ReconOS v4.0, which was released in June 2017, allows the usage of the Xilinx Vivado toolflow. This is an important step as it allows the usage of high-level synthesis (HLS) tools and newest Xilinx Series 7 and UltraScale(+) FPGAs. Additionaly, hardware threads can now have individual and run-time configurable clock lines, enabling higher performance.