Cobham Gaisler is a world leader in embedded computer systems for harsh environments, with footprints in many parts of the solar system. We provide the full ecosystem to support digital hardware design for mission critical System-on-a-Chip solutions. The IP cores and development tools support processors based on the SPARC and RISC-V architectures. In addition to this, a number of standard components are available.

NOEL-V Software Overview

This page provides a brief overview of the software components provided by Cobham Gaisler for the NOEL-V 32- and 64-bit RISC-V. The software ecosystem for our LEON processor family is described here and its software life cycle. Software are also available through other vendors, our partners and open-source communities:

The software provided by Cobham Gaisler aims to be available for all our FPGA platforms, devices and custom designs making it possible to select any OS and tool for any processor device when starting a new project. The hardware configuration selected by impose limitation of choice.

Target software

The software provided are mainly NOEL-V BSPs, device drivers and compiler toolchains together with the integration into the developer tools / ecosystem. Currently we provide NOEL-V SW packages for:

  • VxWorks
  • Linux
  • GNU GCC Bare Metal C/C++ toolchain environment
  • Zephyr (NOEL-V BSP on request)

Currently we do not provide NOEL-V specific boot loading support.

Device Tree Source and Quick Start Guides

The RISC-V target software needs a Flattened Device Tree (FDT) which describes the hardware system for the OS to find devices and adapt to other system settings. A Device Tree Binary (DTB) is normally loaded into main memory by the boot loader or the GRMON hardware debugger and a pointer to the DTB is given to the OS at boot. The DTB can be built by compiling the Device Tree Source (DTS) specific for the NOEL-V hardware design.

DTS files, describing NOEL-V template designs and FPGA bit-streams, for NOEL-V FPGA demonstration boards are found on their home page, for example the NOEL-V Xilinx KCU105 board, and referenced from the board's the Quick Start Guide.

GRLIB systems classically include AMBA Plug & Play information describing the system buses, I/O registers, interrupts and so on. If the OS/BSP supports reading the AMBA PnP information the DTS may not be needed.

It is recommended to visit the board Quick Start Guide or OS documentation to find specific constrains on the DTB target memory location that may exist.

Host software

NOEL-V is supported through the generic RISC-V ISA support and tested using the compilers listed below and provided pre-built for NOEL-V within the prepared SW components:

  • LLVM Clang

Cobham Gaisler provides the GRMON hardware debugger solution for NOEL-V. It can be used to perform board bring-up, application uploading and execution, RISC-V assembly debugging and C/C++ debugging via GDB or Eclipse IDE without any additional hardware adapter required. The Evaluation version is compatible with the prebuilt FPGA bitstreams provided here and for custom GLIB designs built on the GPL release for free. For commercial GRLIB designs a Professional license for GRMON is required, see ordering

NOEL-V Software Downloads

For a detailed overview of a specific device and environment please consult the SW product's manual and the software overview in the board Quick Start Guide. This section does not cover custom GRLIB SoC designs.

GRMON download page
DTS/DTB files for NOEL-V FPGA demonstration boards
VxWorks 7 SR0650 provided by Cobham Gaisler under commercial license
 NOEL-V buildroot 2020.08 distribution with Linux kernel and OpenSBI (md5)
 Sample Linux image (SMP, networking, login as root) for NOEL-V RV32IMA and RV64IMA (md5)
NOEL-V RTEMS5 Software Development Environment (md5)
Optional RTEMS kernel source (md5)
Bare-metal C/C++ toolchain
NCC C/C++ bare-metal toolchain (md5) 1)
Zephyr RTOS NOEL-V BSP available on This email address is being protected from spambots. You need JavaScript enabled to view it.
  1) Does not require DTS (device discovery by AMBA Plug & Play information)

Software licensing

Most of Cobham Gaisler software packages are freely available under different open source licenses. The following products require a commercial license, with exceptions listed:

  • GRMON debugger
    • Floating or node-locked license, upgrades included until end of life
    • There is a free evaluation license for non-commercial usage for non-FT devices
  • VxWorks 7
    • Commerical license include NOEL-V BSP and GRLIB device drivers
    • A source code license for RISC-V is required from Wind River, version indicated on home page for VxWorks 7.

For license inquiries please contact This email address is being protected from spambots. You need JavaScript enabled to view it. for more information.