The Wiert Corner – irregular stream of stuff

Jeroen W. Pluimers on .NET, C#, Delphi, databases, and personal interests

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Archive for the ‘Hardware Development’ Category

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Tumbleweed on Raspberry Pi 3 – Bug 1084419 – Glibc update to 2.27 causes segfault during name resolution

Posted by jpluimers on 2018/03/15

Need to watch these:

A few notes:

  • It is inside the glibc name resolution
  • IPv6 is OK, IPv4 fails.
  • ping/nslookup (which do not depend on glibc) are OK
  • there is an intermediate fix requiring direct osc downloads

A simple test case

Failing situation

$ curl --silent --show-error http://example.org > /dev/null
Segmentation fault (core dumped)

Succeeding situation

$ curl --silent --show-error http://example.org > /dev/null

Non related, but in hindsight my own stupid fault during a similar update: a post mortem

Most important bits of my external infrastructure - page 1

Most important bits of my external infrastructure – page 1

I thought I had forgot about the SuSEfirewall2 changes (On my research list: migrate from OpenSuSE SuSEfirewall2 to firewalld) so assumed that was the reason I broke one of my secondaries (which runs on a Raspberry Pi 2):

Mistakes like these are the reason to have secondaries in the first place https://infrastatus.wiert.me and do port-mortems.

Which is kind of odd, as the SuSEfirewall2 didn’t throw any warnings like at this similar one:

This one still works because it is on the firewall in front of the Raspberry Pi 2:

(Screenshots of the above URLs are below).

In fact it was another mistake: I had forgotten to make the DHCP lease static, which resulted in a wrong IP address to be assigned upon reboot, instantly making the firewall rules invalid:

I could have fixed this remotely when I had thought about this.

–jeroen

Read the rest of this entry »

Posted in *nix, Development, Hardware Development, Linux, openSuSE, Power User, Raspberry Pi, SuSE Linux, Tumbleweed | 3 Comments »

Koushik Dutta (Koush) – Google+Hackintosh Guide: GA-X99P-SLI | Intel 6950X | GTX 980ti

Posted by jpluimers on 2018/03/05

If I ever want to create a GPU grade or server grade Mac system: [WayBack] Hackintosh Guide: GA-X99P-SLI | Intel 6950X | GTX 980ti New Hackintosh is complete. If you want to recreate my setup, here’s the guide I wrote up.… – Koushik Dutta (Koush) – Google+

It’s nicely wrapped up: koush/EFI-X99: Hackintosh Guide: Gigabyte X99P-SLI, Intel 6950X, GeForce GTX 980ti

(Apple still sells Mac OS X Server, but no server grade hardware any more)

Note there are others having an X99 hackintosh.

More details:

–jeroen

Posted in Apple, Development, Hardware Development, Mac, Mac OS X / OS X / MacOS, macOS 10.12 Sierra, Power User | 1 Comment »

Some links on getting a Remeha Avanta 35c connected to LoT

Posted by jpluimers on 2018/03/01

I like LAN of Things over Internet of Things, so I want to connect my Remeha Avanta 35c heater to something that has ethernet.

For Windows, there is Remeha ReCom software:

It connects via an (expensive) “USB” cable which basically is a USB to serial TTL converter:

Note that Avanta/Calenta/Tzerra heaters are all very similar, especially on the communication side.

For their differences, see [WayBack] Veelgestelde vragen – Remeha

–jeroen

Posted in Development, Hardware Development | Leave a Comment »

Always watch your uA sources: The mystery of the Zombie RAM | josh.com

Posted by jpluimers on 2018/02/13

Interesting read [WayBack]: The mystery of the Zombie RAM | josh.com that starts with

It all started one bright morning when I wondered: Can the RAM memory on an AVR chip continue to store data after power is removed? If it can hold the data even just for a brief moment, then…

TL;DR: Always watch your uA sources. Or like Lübbe Onken puts it on G+:

In my first company, we had built a piece of hardware, which turned itself on mysteriously sometimes. We found out that this was caused by a status led that created enough current in bright sunlight.

–jeroen

via:

 

Posted in Arduino, Development, Hardware Development | Leave a Comment »

Using a Mac for prepping the SD-card for an ODROID-C1+

Posted by jpluimers on 2018/02/12

Some notes based on The woods and trees of OpenSuSE on single-board computers – image abbreviations – and getting it installed using OS X « The Wiert Corner – irregular stream of stuff.

I needed to get Ubuntu on an ODROID-C1+ (as it looks like nobody is maintaining a current OpenSuSE for it).

Installing the ODROID-C1+ image using OS X

Download image

Download either of these (note that “minimal” is different from “mate minimal”; see https://www.youtube.com/watch?v=jOYWx_YToh8) from de.eu.odroid.in/ubuntu_16.04lts:

Put image on SD card

I installed on a 8 gigabyte SD card that revealed itself as /dev/disk1 using this diskutil command (via osx – List all devices connected, lsblk for Mac OS X – Ask Different [WayBack])

diskutil list

So this wrote the image to SD card in a sudo su - prompt:

targetDevice="disk1"
unxz --keep ubuntu-16.04-minimal-odroid-c1-20160817.img.xz; \
diskutil umount "/dev/${targetDevice}s1"; \
dd bs=1m of="/dev/r${targetDevice}" if=ubuntu-16.04-minimal-odroid-c1-20160817.img; \
sync; \
diskutil list; \
diskutil eject "/dev/${targetDevice}"

Boot and first time steps on Odroid

Use the default user and password that [WayBack] ODROID Forum • View topic – Ubuntu Minimal User / Password mentions:

odroid login: root
Password: odroid

From there, create a new user and add it to the sudo group (I used visudo to check the correct group for sudoers) :

adduser jeroenp
addgroup jeroenp sudo

And then hook it up to the network and get the IP address:

ifconfig

Now you can ssh into the odroid with user jeroenp and the password assigned to it. You can also perform a sudo su - to get to root level.

ssh and configure a few things

First of all, install etckeeper as it’s a life saver:

apt-get install etckeeper

This will install some other packages, but that’s OK; it will end suggesting you to enter email address, name and perform an initial commit:

Initialized empty Git repository in /etc/.git/

*** Please tell me who you are.

Run

  git config --global user.email "you@example.com"
  git config --global user.name "Your Name"

to set your account's default identity.
Omit --global to set the identity only in this repository.

fatal: unable to auto-detect email address (got 'root@odroid.(none)')
etckeeper commit failed; run it by hand

Do that:

cd /etc
git config --global user.email "example@example.org"
git config --global user.name "Example User"
git commit -m "initial commit"

Now perform these steps:

  1. Change the root password
  2. Disable etckeeper daily autocommits
  3. Change the hostname
  4. Update/Upgrade/Distribution-upgrade
  5. Fix the cursor in console mode

Change root password:

# sudo su -
# passwd
Enter new UNIX password:
Retype new UNIX password:
passwd: password updated successfully

Disable etckeeper daily autocommits involves one line in /etc/etckeeper/etckeeper.conf:

-#AVOID_DAILY_AUTOCOMMITS=1
+AVOID_DAILY_AUTOCOMMITS=1

Change the hostname; assuming your new host name is newHostName.

  1. edit /etc/hosts and replace the old hostname with newHostName
  2. Perform these commands:
    hostnamectl set-hostname newHostName
    exec bash
    hostname -f

Both the command prompt and the hostname output should show newHostName.

Update/Upgrade:

apt-get update
apt-get upgrade

Fix the cursor in console mode:

Somehow the Odroid C1+ does not support a blinking hardware text cursor.

 

–jeroen

Posted in *nix, *nix-tools, Development, etckeeper, Hardware Development, Linux, Odroid, openSuSE, Power User, Raspberry Pi, SuSE Linux, Tumbleweed, Ubuntu | Leave a Comment »

Some KlikAanKlikUit links – it runs at 433 Mhz is insecure, but for lights should work fine

Posted by jpluimers on 2018/01/09

Since I’ve an old TPC-200 lying around…

–jeroen

Posted in Development, Hardware Development | Leave a Comment »

Some links on multicast networking, Raspberry Pi and DVB USB adapters that help you build a TV server

Posted by jpluimers on 2017/12/26

A cool set of YouTube videos by CWNE88:

The USB device used here is this one:

Tuner is AVerMedia AVerTV Volar Green
There are 2 models, but the good one uses firmware dvb-usb-it9135-02.fw The other one uses dvb-usb-af9035-02.fw but that didn’t seem to work as well and got hot. They look the same on the outside though.
ID 07ca:3835 AVerMedia Technologies, Inc. AVerTV Volar Green HD (A835B)

–jeroen

Posted in Development, Hardware Development, Power User, Raspberry Pi | Leave a Comment »

OpenBSD on PC Engines APU2 | Hacker News

Posted by jpluimers on 2017/11/21

Via [WayBack] OpenBSD on PC Engines APU2 | Hacker News and [WayBack] Ilya S – Google+ commenting at [WayBack] I am thinking about moving to BSD as my main OS – Joe C. Hecht – Google+:

Just in case I want to build my own router on PC Engines APU2 hardware: installation instructions at [Wayback/Archive] elad/openbsd-apu2: OpenBSD on the APU2

–jeroen

Posted in APU, Development, Hardware, Hardware Development, Internet, Network-and-equipment, Power User, routers | Leave a Comment »

A 4-bit Calculator made in cardboard and marble

Posted by jpluimers on 2017/11/14

Cool device: [WayBack] A 4-bit Calculator made in cardboard and marble

I really love this. Not just that it exists, but how it was made and how it’s explained.

Definitely worth reading.

via: [WayBack] Funny modern abacus https://lapinozz.github.io/learning/2016/11/19/calculator-with-caordboard-and-marbles.html – David Berneda – Google+

–jeroen

Posted in Algorithms, Development, Hardware Development, Software Development | Leave a Comment »

MX Backup – Postfix Email Server | samhobbs.co.uk

Posted by jpluimers on 2017/11/09

Interesting as it has steps for both OpenSuSE and Debian each well suited for running on a Raspberry Pi.

[WayBack] MX Backup – Postfix Email Server | samhobbs.co.uk

It seems postfix is a lot easier to configure than sendmail so I already like it.

First I need to read a bit more in Postfix greylisting.

I’ll need to catch up on Sam’s other parts with the postfix tag as well:

–jeroen

Posted in *nix, *nix-tools, Debian, Development, Hardware Development, Linux, openSuSE, Power User, Raspberry Pi, Raspbian, sendmail, SuSE Linux, Tumbleweed | Leave a Comment »

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