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Welcome to the 55th issue of TMPDIR, a weekly newsletter 📰 covering Embedded Linux, IoT systems, and technology in general. Please pass this on to anyone else you think might be interested. Suggestions and feedback are welcome at ✉️

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Thanks for reading!

Khem and Cliff

Quote for the week

Problems that remain persistently insoluble should always be suspected as questions asked in the wrong way. --Alan Watts

Yoe 2023.03 release 🚀

This release has some major updates, e.g. base clang compiler is updated to the 16.0.1 release which is a major release; therefore, it is flagging issues in a lot of old code, which required fixing quite a few packages. OpenSSL has been updated to 3.1.

The Yoe updater keeps getting better -- it can now support both tmpfs and persistent /data overlay and uses xz compressed ext4 rootfs for updates to reduce the size of update. We now have a yoe-installer-image image that creates a SD card installer which would provision the eMMC on boot automatically. This will help installing/reinstalling factory images. Support for the VAR-SOM-MX8 symphony evaulation kit is added to the updater, which should make it easy to port it to MX8 based SOM products.

Systemd is upgraded to 253.1. It brings basic support for loongarch64 architecture but there is no machine support for it in yoe yet.

binutils now defaults to preferring DT_RUNPATH and is compiled with --enable-new-dtags. This should help tighten up security on systems with shared libs a bit.


Zephyr is a small RTOS for connected and resource-constrained embedded systems and typically runs on an MCU. We just started experiementing with it on a STM32H7 MCU, and so far are very pleased with it. It is a game changer in the MCU space -- especially as MCUs become more capable and connected.

With these capabilities, I think Zephyr based systems will start to displace some Embedded Linux devices at the edge.

Zephyr has a really nice shell:


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