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Open FPGA Stack Overview

Open FPGA Stack (OFS): OFS is an open-source hardware and software framework that reduces the development time for creating your custom platform. Provided within this framework are reference designs targeting different Altera FPGA devices with upstreamed drivers and management software tools.

The reference shells, called FPGA Interface Manager (FIMs), provide an integrated, timing closed design with the most common interfaces for host attach applications. After selecting your starting shell, you can add or subtract interfaces depending on your application requirements. Then leverage the build scripts, RTL, unit tests, Universal Verification Methodology (UVM) environment, software and drivers for this reference shell as a starting point for your own FPGA platform solution.

OFS currently targets Stratix® 10 and Agilex® 7 FPGA Device Families.
To find out more about Altera FPGAs, visit the Stratix 10 and Agilex 7 pages at Intel.com.


How Can I Start Using OFS?

  1. If you are interested in a production card that uses OFS for your workload application development or for full deployment, please refer to the OFS Board Catalog.

  2. If you are an FPGA developer, refer to our FPGA Developer Journey Guide: Open FPGA Stack to understand the OFS development flow as well as the reference shells, tools and development boards you can use to gest started. FPGA Developers interested in oneAPI should reference this guide as well.

  3. If you are a software developer, refer to our Software Tab for driver and user space tool development resources.

  4. If you are an application developer, preview our overview video on how OFS can help you develop FPGA-based workloads and review one of the AFU Developer Guides to find the OFS resources available for creating your own application workload.

Beyond the resources we have on this site, you can navigate to the OFS GitHub repos by clicking the GitHub repository icon at the top left corner of this site page.

What FIM Reference Designs Are Available?

Below summarizes the five current reference designs (aka FIMs) you can choose from:

OFS FIM Targeting Agilex®7 PCIe Attach (2xR-tile, F-tile)

Key Feature Description
Target OPN AGIB027R29A1E2VR3
PCIe R-tile PCIe* Gen5x16, 2xGen5x8, Gen4x16
Virtualization 5 physical functions/3 virtual functions with ability to expand
Memory * Four Fabric DDR4 channels, x64 (no ECC), 2666 MHz, 8GB
Ethernet 2x4x25GbE, 2x200GbE, 2x400GbE
Hard Processor System Not enabled
Configuration and Board Manageability * FPGA Management Engine that provides general control of common FPGA tasks (ex. error reporting, partial reconfiguration)
Partial Reconfiguration Supported
OneAPI OneAPI Acceleration Support Package (ASP) provided with compiled FIM to support OneAPI Runtime
Software Support * Linux DFL drivers targeting OFS FIMs
* OPAE Software Development Kit* OPAE Tools
Target Board Agilex® 7 FPGA I-Series Development Kit (2x R-Tile and 1xF-Tile)

Click here for the OFS Collateral for Agilex® 7 FPGA PCIe Attach Reference FIM documentation collection.


OFS FIM Targeting Agilex®7 PCIe Attach (2xF-tile)

Key Feature Description
Target OPN AGFB027R24C2E2VR2
PCIe F-tile PCIe* Gen4x16
Virtualization 5 physical functions/3 virtual functions with ability to expand
Memory 3 DDR Channels:* One HPS DDR4 bank, x40 (x32 Data and x8 ECC), 2400 MHz, 1GB each* Two Fabric DDR4 banks, x64 (no ECC), 2400 MHz, 8GB
Ethernet 2x4x25GbE
Hard Processor System 64-bit quad core Arm® Cortex®-A53 MPCore with integrated peripherals.
Configuration and Board Manageability * FPGA Management Engine that provides general control of common FPGA tasks (ex. error reporting, partial reconfiguration)
Partial Reconfiguration Supported
OneAPI OneAPI Acceleration Support Package (ASP) provided with compiled FIM to support OneAPI Runtime
Software Support * Linux DFL drivers targeting OFS FIMs
* OPAE Software Development Kit* OPAE Tools
Target Board Agilex® 7 FPGA F-Series Development Kit (2x F-Tile)

Click here for the OFS Collateral for Agilex® 7 FPGA PCIe Attach Reference FIM documentation collection.


OFS FIM Targeting Agilex®7 PCIe Attach (P-tile, E-tile)

Key Feature Description
Target OPN AGFB014R24A2E2V
PCIe P-tile PCIe* Gen4x16
Virtualization 5 physical functions/3 virtual functions with ability to expand
Memory 5 DDR Channels:* One HPS DDR4 bank, x40 (x32 Data and x8 ECC), 1200 MHz, 1GB each* Four Fabric DDR4 banks, x32 (no ECC), 1200 MHz, 4GB
Ethernet 2x4x25GbE, 2x4x10GbE or 2x100GbE
Hard Processor System 64-bit quad core Arm® Cortex®-A53 MPCore with integrated peripherals.
Configuration and Board Manageability * FPGA Management Engine that provides general control of common FPGA tasks (ex. error reporting, partial reconfiguration)
* Platform Controller Management Interface (PMCI) Module for Board Management Controller
Partial Reconfiguration Supported
OneAPI OneAPI Acceleration Support Package (ASP) provided with compiled FIM to support OneAPI Runtime
Software Support * Linux DFL drivers targeting OFS FIMs
* OPAE Software Development Kit* OPAE Tools
Target Board Intel® FPGA SmartNIC N6001-PL

Click here for the OFS Collateral for Agilex® 7 FPGA PCIe Attach Reference FIM documentation collection.


OFS FIM Features Targeting Agilex® 7 SoC Attach

Key Feature Description
Device OPN AGFC023R25A2E2VR0
PCIe P-tile PCIe* Gen4x16 to the Host
P-tile PCIe* Gen4x16 to the SoC (IceLake-D)
Virtualization Host: 2 physical functions
SoC: 1 physical function and 3 Virtual functions
Memory Four Fabric DDR4 banks, x40 (optional ECC, be configured as x32 and ECC x8 ), 1200 MHz, 4GB
Ethernet 2x4x25GbE
Configuration and Board Manageability * FPGA Management Engine that provides general control of common FPGA tasks (ex. error reporting, partial reconfiguration)
* Platform Controller Management Interface (PMCI) Module for Board Management Controller
Partial Reconfiguration Supported
Software Support * Linux DFL drivers targeting OFS FIMs
* OPAE Software Development Kit * OPAE Tools
Target Board Intel® Infrastructure Processing Unit (Intel® IPU) Platform F2000X-PL

Note: Source code for BMC RTL/Firmware that works with this reference FIM can be obtained by contacting your Altera Sales Representative.

Click here for the OFS Collateral for Agilex® SoC Attach Reference FIM documentation collection.


OFS FIM Targeting Stratix® 10 FPGA PCIe Attach

Key Feature Description
Device OPN 1SX280HN2F43E2VG
Ethernet Configuration 1x10GbE example with 2x100GbE capability
PCIe Gen3x16
EMIF Up to four DDR channels
PF/VF 1 PF/3 VFs
Management FPGA Management Engine (FME) with FIM management registers
Interface Arm® AMBA®4 AXI Interface
HLD support oneAPI
Software Kernel code upstreamed to Linux.org
Target Board Intel® FPGA Programmable Acceleration Card D5005

Click here for the OFS Collateral for Stratix® 10 FPGA PCIe Attach Reference FIM) documentation.

To find information on the latest releases, go to the Discussions Tab in the OFS GitHub repository.


Open FPGA Stack Repositories

Accessing OFS ingredients to use within the development framework is easy. The github.com/OFS site provides all the hardware and software repositories in one location.

Development Focus Repository Folder Description
Hardware ofs-agx7-pcie-attach Provides RTL, unit tests, and build scripts to create an Agilex® 7 FIM and is leveraged as a starting point for a custom PCIe Attach design. The provided reference FIM can target the following boards:
    • Intel® FPGA SmartNIC N6001-PL Platform
    • Agilex 7 FPGA F-Series Development Kit (2x F-Tile)
    • Agilex 7 FPGA I-Series Development Kit (2 x R-Tile, 1 x F-Tile)
Hardware ofs-f2000x-pl Provides RTL, unit tests, and build scripts to create Agilex® FIM and is leveraged as a starting point for a custom SoC Attach design. The reference FIM targets an Intel® FPGA IPU F2000X-PL Platform.
Hardware ofs-d5005 Provides RTL, unit tests, and build scripts to create Stratix 10® FIM and is leveraged as a starting point for a custom PCIe Attach design. The reference FIM targets an Intel® FPGA PAC D5005 development board.
Hardware oneapi-asp Contains the files to generate the support package that works with the reference shells and allows you to use OneAPI. This is an optional repository for developers interested in OneAPI
Hardware ofs-fim-common Provides RTL components that are shared among all new platforms that are introduced in OFS. This folder is a subumodule in each platform repository folder.
Hardware examples-afu Provides simple Accelerator Functional Unit (AFU) examples you can use as a template for starting your own workload design.
Hardware ofs-platform-afu-bbb Contains the hardware code to build a standard interface between the FIM and your workload.
Software linux-dfl This repository is a mirror of the linux.org Git site and contains the most up-to-date drivers that are being developed and upstreamed for OFS platforms.
Software meta-ofs This repository provides the Linux® DFL kernel and the OPAE SDK for the Yocto® Project.
Software opae-sdk Contains the ingredients to build the OFS Open Programmable Acceleration Engine (OPAE) Software Development Kit which provides APIs and userspace tools for OFS FPGA management.
Software opae-sim This repository is used to build the AFU Hardware/Software Co-Simulation Environment workload developers can use to ensure their AFU can work with the OFS software stack.
Software linux-dfl-backport A place for finding and leveraging out-of-tree backported drivers for older OS versions .
Software opae-legacy Supports OFS platforms built on the legacy version of OPAE software. Not used in current OFS designs
Documentation ofs.github.io Contains the hardware and software collateral that surfaces on the OFS website: https://ofs.github.io