Because we had to find out the painful way: The Waveshare IO BASE Module B for the Raspberry Pi CM4 module does not work with the 4" DSI Touch Display from Waveshare - at least not as long as you use a BASE IO board revision < 4.
Only from board version 4 the higher performance DSI1 interface is used instead of the DSI0 interface of the Raspberry CM4 by the IO Base Board.
Until a few hours ago we had to deal with a strange bug related to the C++ HTTP library “Pistache”, which could not be identified completely at first. Maybe we are not the only ones - so in this post we want to briefly present the setup and our fix.
When compiling Qt 5.15.2 from the official open source sources, we encountered a problem in combination with our build server: The build process was interrupted while compiling the Chromium-based “WebEngine” component with initially mysterious error messages. A look at the kernel log using dmesg -w then quickly revealed that the so-called OOM killer of the Linux kernel had struck. Apparently the RAM consumption of the build process was so memory-intensive that the process had to be aborted to keep the operating system running.
Welcome to the Tech Blog of ZERO GmbH!
Soon we will present here experiences and notes from our technical development, in the hope that they will be helpful for others.