Lorenz Brun

Mass-erasing TI CC13xx/CC26xx chips with OpenOCD

I recently had some custom PCBs made to be able to integrate a ZigBee coordinator into the Banana Pi R3 router. The currently best-supported SoC for running ZigBee coordinators is widely considered to be TI's CC2652P2 due to its generous RAM and Flash as well as the integrated 20dBm power

Hardware

Bypassing Lenovo's WiFi Module Authorization

I recently resurrected an old Lenovo notebook (a Lenovo Yoga 2 Pro specifically) as a test machine for various things. For being such an old machine (first released in 2014) it still performs relatively well, the display, SSD, CPU and memory are still fine for smaller tasks. But the integrated

Making SPI work on the ROCK64 (and similar Linux SBCs)

Recently I needed to connect a SPI device to a ROCK64 SBC running mainline Linux (5.19 at the time of writing) for use with a userspace SPI driver (spidev) as Linux doesn't have a device class nor a driver for it. I initially thought this would be quite simple,

Repairing Git commit graphs

Recently a GitLab instance I maintain suddenly alerted me to a repository which didn't pass a git fsck. While investigating I saw that git pretty much refused to operate on this repository completely. Even a git log quickly resulted in fatal: commit-graph requires overflow generation data but has none. So

UniFi AP DHCP adoption with URL

UniFi APs can automatically annonce themselves to a controller for adoption via either a DHCP option (43) or the unifi DNS name. But sadly both options don't officially allow you to configure a URL instead of just an IP address. If the controller is not hosted locally this is quite

Enabling S3 sleep on a DeskMini X300

TL;DR: Follow the README in https://github.com/lorenz/asrock-x300-s3-fix The ASRock DeskMini X300 is a very affordable barebone computer for everything that doesn't require more than 8C/16T or a necessitates an external GPU. Equipped with a 5700G, 32 GiB of RAM and a 512GiB of fast NVMe

Using Go Modules with GitLab repos

I wanted to share a small trick for using Go 1.11+ modules with GitLab repos. If you just try to import another repo and run a build or test using GitLab CI, this happens: fatal: could not read Username for 'https://git.dolansoft.org': terminal prompts disabled Go (calling

CoreOS

Dealing with bad RAM on Linux

I have a server that has a single byte of RAM which is defective. Usually you just RMA the affected sticks, but I felt it was kind of wasteful to do that for just a single byte of a 8GiB stick that was otherwise still perfectly fine. Under Linux you

Storage

Setting up ZFS on CoreOS

Recently I needed to expand my disk storage in my server. I previously had 2x2TB of old WD Green disks in a BTRFS RAID1. Now I upgraded to 8x3TB and a dedicated SAS2008-based controller. As a filesystem I opted for ZFS because I wanted parity-based RAID and Btrfs's implementation is