Xavier Ruppen

Xavier Ruppen

I am an R&D engineer focusing on embedded software development. I also do board design on a hardware level and work with FPGAs. My projects mainly involve Linux, RTOSes, HPC, FPGAs and SDR.
Intel® Arria® FPGA Development Kits

A quick note on some Arria 10 intricacies

A previous article on this blog, “Everything mainline from the ground up”, shows how to build mainline U-boot and Linux for Altera socfpgas. While the Cyclone V and the Stratix 10 are widely used and well supported, much cannot be said about the Arria 10. The Arria 10’s bitstream is separated in two parts: the so-called “peripheral” and “core” bitstreams (the A10 Reference Manual gives more information about this). While a single .sof file may contain both the peripheral and the…

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Achilles Arria 10 SoC SoM board

Arria 10: adding support for the Reflex CES R329 board in Linux

In this article, I will document the process of porting the latest Linux to an Arria 10 board, the Reflex CES R329, and start it using TFTP. Starting the board Hook the BLASTER micro-usb port to your computer. Power-on the board and connect to it using picocom: Your board will boot to Linux. Before it does, interrupt the boot process by pressing on any key. You’re now in U-boot. The printenv command will show you the saved environment variables. By…

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Schematic of the Cyclone V SX SoC Development Board

Socfpga: Everything mainline from the ground up

Altera’s tools for generating U-boot and Linux are a bit messy, outdated at best. For example, last time I checked their auto-generated U-boot dates back to 2014. Let’s try to build and run an up-to-date version of U-boot and Linux. U-boot build First, clone the repository. A variety of defconfigs exist for different boards. For example, building U-boot for the Altera’s Cyclone V development kit: This will result in a u-boot-with-spl.sfp file being created. flash The SoCFPGA boot ROM will…

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Building a full SDR stack from source for LimeSDR

Rationale Generally speaking, building from source offers one key advantage: it is the only way to test the latest features offered by the community. Moreover, if you intend to develop or fix bugs (or even help the community fix bugs), you will need to have a working and up-to-date software environment. All in all, compiling LimeSDR’s software stack is fairly straight forward. It is barely a matter of getting the right cmake options. While we want to compile as many…

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Cooling the LimeSDR (with IR pictures)

One thing that struck us as well as the community is the overall heat that is cumulating on the LimeSDR. Having worked with the Ettus B210, we were surprised of the 60°C shown in LimeSuite under no significant load. Some were concerned by the premature degradation of the board, but heat may also impact RF performances (chapter 4.4). As such, we decided to take action against what we considered could be a problem. This SDR contains three main chips: a Cypress FX3 CPU,…

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About This Site

Technical articles related to the development work performed at the REDS institute, HEIG-VD (Switzerland).

The REDS institute is part of the High School of Engineering, Vaud. Its core skills involve board conception, firmware development and FPGA programming.

Find more at http://www.reds.ch