Category Archives: Geek stuff

CNC free software – resurrection of legacy mill

Back in the days when PCB making was expensive I started to look at ways to do that on my own. There were basically two: photo lithography and etching or milling. I did not like the idea of having to handle the nasty chemicals for etching so I first decided to get myself a CNC milling machine. Later on I… Read more »

Guerilla Photovoltaik

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Nachdem die Einspeisevergütung für Photovoltaik (PV) Anlagen enorm gesunken sind, lohnt sich dies eigentlich gar nicht mehr. Der Strompreis für Verbrauchsstrom ist allerdings nach wie vor hoch und sogar noch gestiegen, um die 0,30€ pro kWh brutto. Stromverbrauch zu senken ist eine Methode die Energiekosten zu reduzieren. Wer eine freie Fläche von ein paar Quadratmetern mit Blick in Richtung Süden… Read more »

Finally, S0i3 is there! Thinkpad Tablet 10 sleeps deeply with Linux kernel 4.15rc

This is so good news, finally! I have been waiting for this for almost two years now. What happened? This happened: root@bones:~/bin# ./pms before sleep: AC online @ 0.00W | Cap-remain 26.88Wh | Voltage 4.183V | Remain 0h 0m S0IR Residency: 0us S0I1 Residency: 0us S0I2 Residency: 0us S0I3 Residency: 0us S0 Residency: 198783424us after sleep: AC online @ 0.00W… Read more »

Purism Librem 5 – It’s Coming!

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Some may already be aware of it, since September 2016 I am member of the Purism Advisory Board and consulting Purism in matters of mobile devices. As development continues I have been asked beginning of 2017 if I could imagine to lead a mobile device development. After some further discussion about possibilities I started to lead a mobile device development… Read more »

Intel ME – When the sh*t hits the fan :)

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You know, there is a lot of cruel stuff going on these days. Freedom is cut away in many places which in many cases is done by taking away power and control. Having full control over something means to have power and to have the freedom to use this power or not. The Intel ME is a technological implementation of… Read more »

Building root filesystems

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One of the most common issues in embedded device engineering is how to create a development toolchain and following this how to create a root filesystem to run on the target. These are sometimes also called development and runtime systems. There are several solutions to do this but let us look at some of the challenges first. Challenges Reproducibility There… Read more »

Purism Librem 15 – First impressions

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Yesterday I finally received a Purism Librem 15 laptop for review. A few months before I also got a Librem 13 v1 which was already pretty nice but showed some details that I did not fully like for a device at that price point. The new Librem 15 v2 in contrast is a really nice device. First of all all,… Read more »

Kirkwood, Orion: Mainline Linux 4.12 for TK71

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A client asked for more recent Linux kernel support for a Marvell Kirkwood/Orion 88F6281 based board made by KaRo, the TK71. This is a Q7 form factor CPU module running @ 1.2GHz with two GBit Ethernet ports, two SATA ports, USB2.0 and PCIe support. The TK71 usually comes with 256MB of RAM, a 512MB version is available upon request. The… Read more »

Etnaviv on i.MX6, free OpenGL GPU driver

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For a project I am currently evaluating embedded CPUs, so called system on chip (SOC), mostly ARM architecture. One major requirement of the project is to use free and open source software only, without any binary firmware blobs. Introduction You may have heard about the big issues found lately about e.g. the Intel Management Engine (ME) which is part of… Read more »