Containers are part of the vast majority of daily interactions with software and the cloud these days. From building applications in a reproducible way to defining standards in deployment, containers brought ease and agility to IT.

RISC-V is a free and open-source instruction set enabling a new era of processor innovation through open standard collaboration. Born at the University of Berkeley, RISC-V ISA delivers a new level of free, extensible software and hardware freedom on architecture, paving the way for the next 50 years of computing design and innovation.

Together they bring real openness to the future of cloud ecosystem…

There’s a lot of posts and references about submitting patches to the Linux kernel or projects that receive patches in file/email format.

The idea here is to have a quick guide about the basic commands to get things done.


First checkout the working tree. For Linux it’s usually the stable at or Linus at containing latest changes not yet released.

$ git checkout

Then, edit your required files. It’s advised that you keep meaningful functionality together and break them into different commits (that will generate separate patches). …

This post is a guide on getting up-and-running with the SolidRun LX2K based boards installing the Firmware and Linux.

The HoneyComb/ClearFog system are the carrier boards (the difference is that the ClearFog has a QSFP28 module) and both use a beefy ARM SOM (System On a Module) based on the NXP LX2160A SOC, a 16-core based on the Cortex-A72 running at stock 2.0 GHz clock. They support up to 64GB RAM and are one of the most powerful ARM boards you can buy not counting the multi-thousand dollar servers using Ampere/Qualcomm/Cavium CPUs.

It makes a great developer workstation, ARM Server/buildbox…

In this post I’ll explore a bit the Open Source toolchain for Xilinx Series 7 FPGAs and will focus the Artix 7. The post will detail how to run the complete flow using Docker containers avoiding local toolchain installs and homogenizing the process for most platforms (Linux, Mac, Windows).

This post originated from a live-tweed. The thread can be seen at

I'll show here how to add support for a new board, the Digilent ArtyA7, a very popular FPGA board based on Xilinx Artix7, to my Chisel ChiselBlinky project including FuseSoc support.

Chisel is an HDL (Hardware Design Language) based on Scala that provides more abstractions and the power of a fully-featured language to generate hardware.

FuseSoc is a package manager and generator for FPGA designs. With FuseSoc you can instantiate modules and define how each design will be generated on a multitude of FPGA backends. Usually each…

Much is being talked about the latest vulnerability mitigations on L1 cache for IBM POWER processors addressed in CVE-2020–4788.

Update on 23/11: This post has been updated to address Pgbench tests that provides more realistic numbers related to the CVE and mitigations. Check the PGbench section below.

The intent of this post is to run some preliminary benchmarks with and without such mitigations. There is no scientific method for the tests other than full reboots and replication of the scenarios between versions. For complete tests, check out in the future for Phoronix benchmarks.

The tests were performed on a Raptor…

As a follow-up post to my previous post about adding authentication transparently to an application

Configuring Keycloak

Go to the left-side menu item “Client Scopes” and click “Create”:

Create a new client scope called “api” with default settings, then click the “Mappers” tab to add the field mappings to this scope.

In this tab, create a new mapper called “groups” with the following settings:

In this post, I'll go thru the process of running Virtual Machines on OpenShift Virtualization in a nested setup inside VMware vSphere. This requires both ESXi hosts and a VCenter, both on 6.7U3 or up.

Nested virtualization is a configuration where the Virtual Machine running the OpenShift Node on ESXi exposes the bare metal capabilities so new Virtual Machines can be created inside it. This could be used as a showcase for the technology, lab environment or POCs. OpenShift VMs are based on KVM, the virtualization layer from the Linux Kernel and are implemented based on the KubeVirt project.

I recently received a NVIDIA Jetson Xavier NX board to review and write some posts. The first one is an unofficial guide to upgrade Ubuntu 18.04 to latest Ubuntu Focal (20.04).

Here I will do some benchmarks and compare the performance between the Jetson NX and other SBCs. A while back, I’ve benchmarked some ARM boards comparing their performance on Java and other workloads. Here I will do a similar approach and add some GPU and power consumption tests and comparisons.

Of course the price range varies a lot, from $79 for the Odroid N2 and the RockPro64 to $399…

I recently received a NVIDIA Jetson Xavier NX unit to review and write about some use cases like a local development computer and cloud application deployments with containers in a Kubernetes cluster.

In this post I’ll talk about upgrading it to latest Ubuntu version that is nice for a local development and day-to-day desktop use.

Disclaimer: Ubuntu Focal and the upgrade process are not supported by NVIDIA. You should do on your own discretion and try to isolate problems that might occur with this.

JetPack 4.4 is the NVIDIA stack containing Linux, board drivers and SDKs for GPU, AI and…

Carlos Eduardo

Writing everything cloud and all the tech behind it. If you like my projects and would like to support me, check my Patreon on

Get the Medium app

A button that says 'Download on the App Store', and if clicked it will lead you to the iOS App store
A button that says 'Get it on, Google Play', and if clicked it will lead you to the Google Play store