Keeping Track of Time with Systemd

Nearly all smart devices obtain and keep track of time – it’s something that ‘just works’ and something which we often take for granted. Yet under-the-hood there is a surprising amount of complexity – software needs to obtain an accurate external source of time (e.g. NTP), it needs to handle drift and gradual synchronisation between …

Filesystem Encryption on a Jetson Nano

NVIDIA’s Jetson Nano (NVIDIA X1 CPU) platform is one of the most popular embedded systems for any application that involves video processing. The standard development environment for it is a Ubuntu based system, whilst this is fine for simple development and prototyping, it is not really ideal for a serious production ready embedded device based …

Xmas Charity Fundraiser 2021

This Xmas the Good Penguin is raising money for The Forever Friends Appeal – the official NHS charity for the Royal United Hospital (RUH) in Bath. The money we raise will go to the newborn intensive care unit (NICU) to provide state-of-the-art treatment, diagnostic equipment, and to support families at one of the most vulnerable …

An overview of OpenSBI

Thanks to BeagleBoard.org, we’ve recently received a pre-production beta version of the BeagleV StarLight development board. It’s an affordable Linux platform that’s truly open source with it’s software, hardware design and RISC-V instruction set architecture all made available under free and open licenses. When we booted the board for the first time we noticed some …

An overview of PSCI

If you boot a 64-bit kernel on an ARMv8-A platform, you’ll probably notice some output relating to PSCI. In this post, we’re going to explore what this is and why it’s there. The Power State Coordination Interface (PSCI) is an ARM standard that describes a software interface for power management between an operating system (not …

5 Serial Automation Gotchas

Automated tests that make use of interactive consoles are commonplace. Whether it’s a Linux console over a serial port or a proprietary CLI over a network socket – they require little in terms of hardware yet give access to lots of functionality. However writing a reliable automated test can be more challenging and time consuming …