Ferdinand Keil's

electronic notes

Articles in the "Today I Learned" category

Mär 22, 2020

Missing Kernel Header when installing VBox-Guest Extensions on CentOS

When installing the VirtualBox guest-extensions on a fresh CentOS installation the installer asks for the kernel headers to compile the necessary modules. To install these just type:

yum install kernel-devel kernel-headers

Here is the important part: when the installer for the guest-extensions keeps complaining that The headers for the current …

Mär 21, 2020

Feb 29, 2020

Atomic Test-and-Clear on the 8051

When running multiple tasks simultaneously on an embedded system using cooperative task scheduling you might run into situations (at least I did 😁) where these tasks might need to access the same hardware peripheral. Not all peripherals can be shared easily due to their configuration or some other kind of internal …

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