Kernel

Pengutronix has contributed a total of 45 patches to Linux 7.1 and all of them went to drivers and their documentation.

Michael Tretter has implemented support for reading the firmware version of st1232 touchscreens.

Sascha Hauer has modified the Freescale Layerscape PCIe controller driver so it can be built as a module.

Michael Tretter has resolved a build error in the LED Multicolor interface.

Marco Felsch has introduced support for the EDT ET057023UDBA display panel.

The NXP i.MX6 image processing unit (IPUv3) allows blending two video planes in hardware. One plane, called the "primary plane", spans the whole screen, and the other one, called the "overlay plane", may be smaller and positioned somewhere in the output. Albeit the name, i.MX6 supports blending the "overlay plane" below the primary plane, which makes sense given the primary plane supports transparency. Thanks to Michael Tretter's series drm/imx: ipuv3-plane: support underlay plane, this feature is now supported by the linux kernel.

Another media interface on the i.MX 5 and 6 SoCs is the CSI, the Camera Sensor Interface. In the patch series media: staging: imx: fix multiple video input, Michael resolved an issue that could leave hardware in an inconsistent state when an input stream was started while another one was already running.

In the Industrial IO (iio) subsystem, Oleksij Rempel has contributed support for the DS4402 and DS4404 Digital Analog Converters to the ds4424 driver and provided further improvements and fixes along the way.

Steffen Trumtrar added support for a new display panel and an i.MX8MP board variant that uses it. Fabian Pfitzner added lots of hardware features to the device tree of the FRDM i.MX 8M Plus Development Board.

Jonas Rebmann provided some improvements to the ina2xx power measurement chip driver.

Marco Felsch has worked on the Power Management Domain driver of the i.MX91 and i.MX93 providing general improvements and proper support for subdevices. Subdevices in the context of pmdomain are devices relying on other devices to indirectly power them from the power management controller.

Finally, our colleague Marc Kleine-Budde has contributed eleven patches to the i.MX Low Power SPI (LPSPI) driver. This makes the driver more readable by cleanly following manufacturer specs, removing obselete code, migrating to kernel best practices, and simplifying some constructs.

OP-TEE

Much like in the previous installation of this blog series, we've been working on randomness sources in OP-TEE. OP-TEE is the secure OS complementing the linux kernel with applications running in the trusted execution environment of the ARM CPU. The prime purpose of these applications is asymmetric cryptography, and that needs proper random numbers.

For cryptographic applications these should be provided either by a hardware random number generator (hardware RNG) or by a software RNG seeded by a hardware RNG.

Many hardware platforms which were included in OP-TEE under the assumption that OP-TEE was configured to exclusively rely on hardware RNGs simply omitted the initialization code for software RNGs which lead to an insecure random number source not seeded in hardware if software RNGs were enabled on one of these hardware platforms.

Our colleague Sascha Hauer provided a patch to OP-TEE that would, on affected platforms, make this configuration fail in the build process instead of silently producing an insecure OP-TEE-OS.

candleLight Firmware

Marc Kleine-Budde continued his work on the Firmware for the candleLight USB-CAN-adapter, with a total of 119 commits in 34 pull requests since the last blog post two months ago.

The build-system was improved to feature better compiler detection, that eases builds on Windows and MacOS, a helpful error message if the libc implementation is unsupported, and a helper script for the installation of a supported libc implementation.

CI was updated to include Windows and MacOS and to test with many more toolchain versions.

(De-)initialization code was renovated to resolve issues after suspending or rebooting the USB host during a transfer.

Support for ARM semihosting was introduced to ease debugging of the candleLight.

Furthermore, binary size reduction and countless other improvements and cleanups.

Wider Ecosystem

In Mesa, the Open Source userspace graphic stack, Philipp Zabel has resolved a build warning in the Etnaviv driver.

To the Yocto project, Ahmad Fatoum contributed the barebox update to 2026.04.0, Ulrich Ölmann fixed a typo, and Fabian Pflug backported a patch to allow building pkcs11-provider on 32bit systems.

barebox

barebox has seen close to 400 new non-merge commits of which about 100 where community contributions. 2026.04.0 and 2026.05.0 have been released: Smaller binaries, plenty of hardening, new hardware support, the ability to override any combination of kernel, devicetree and initrd, and much more.

PTXdist

PTXdist 2026.05.0 and 2026.06.0 have been released.

The latter includes some major changes such as enforcement of sha256 checksums for sources of all upstream packages and changes to the SPDX SBoM generation.

In total, our PTXdist maintainer Michael Olbrich has applied 260 patches of which 160 where community contributions.

Labgrid

Labgrid has seen the v25 and v26 releases, take a look at the Changelog to see what's new.

Since the last post, labgrid has merged 16 new pull requests, most of which where community contributions.

RAUC

Into RAUC, we've merged 34 pull requests, most of which where authored by us at Pengutronix. Most of them are on testing, documentation, maintenance and quality improvements.