Marcus Folkesson

Embedded Linux Artist

TIL - U-Boot support for HTTP

TIL - U-Boot support for HTTP TIL, Today I Learned, is more of a "I just figured this out: here are my notes, you may find them useful too" rather than a full blog post Until now, U-Boot did only support UDP and were limited to protocols that are based on that. In practice it meant that you were only able to use TFTP and NFS for network file transfer.

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Posted by Marcus Folkesson on Friday, January 27, 2023

TIL - Virtual CAN interfaces

TIL - Virtual CAN interfaces TIL, Today I Learned, is more of a "I just figured this out: here are my notes, you may find them useful too" rather than a full blog post There are many scenarios where a virtual Controller Area Network(CAN) interface could be handy. It let you develop and test applications that without an actual physical CAN bus. My scenario is to play around with Berkley Packet Filter(BPF) [1] and do some data manipulation on recieved CAN frames in kernel space.

Posted by Marcus Folkesson on Wednesday, November 30, 2022

TIL - Debug FindBoost in CMake

TIL - Debug FindBoost in CMake TIL, Today I Learned, is more of a "I just figured this out: here are my notes, you may find them useful too" rather than a full blog post When you use find_package for a Boost component in CMake it will end up with the FindBoost.cmake [1] module. It is usually located in /usr/share/cmake/Modules/FindBoost.cmake. I had to debug a cross compile setup for an application using CMake, and the root file system did use wierd paths for everything.

Posted by Marcus Folkesson on Tuesday, November 29, 2022

TIL -Yocto bitbake-getvar

TIL - Yocto bitbake-getvar TIL, Today I Learned, is more of a "I just figured this out: here are my notes, you may find them useful too" rather than a full blog post Writing recipes for Yocto has recently become something I do several times a week. All tools that help you with debugging is allways appreciated, and one such tool I found recently is bitbake-getvar that came with the Honister release of Yocto.

Posted by Marcus Folkesson on Wednesday, November 16, 2022

TIL - systemd and $MAINPID

TIL - SystemD and $MAINPID TIL, Today I Learned, is more of a "I just figured this out: here are my notes, you may find them useful too" rather than a full blog post A special environmnent variable, $MAINPID, is set and is available for the .service file. The variable exposes the MainPID property of the service and could be useful if your custom services e.g. forks. This let you do

Posted by Marcus Folkesson on Tuesday, November 8, 2022