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Yocto

QEMU custom peripheral properties
Extending custom QEMU peripherals with properties that can be changed during runtime for interactivity and PyQt6 application for easy manipulation.

QEMU custom peripheral properties

In the QEMU TMP105 QMP interaction newsletter the interaction with an emulated QEMU component via QMP and properties was shown. Using Python and QMP it was possible to change the temperature that the ...

Rust userspace application for QEMU custom peripherals
Rust userspace application using smol for multiple threads, used to interact with custom QEMU peripherals: memory-mapped, I2C and SPI.

Rust userspace application for QEMU custom peripherals

After working with C, C++ and Python for more than 15 years, I got the opportunity to work with Rust at my current workplace (while still working primarily on Yocto and Linux). It has been a pleasant ...

Supporting multiple build configurations with Yocto
Using Yocto multiconfig to support building multiple dfferent configurations from the same build directory at the same time.

Supporting multiple build configurations with Yocto

When adding new MACHINE and DISTRO configurations to Yocto, handling build setup for all of them can become complicated. The increased complexity is especially obvious when new DISTRO configurations a ...

QEMU SPI NOR flash with SWUpdate recovery
Post about adding SPI NOR flash to QEMU Cubieboard, storing recovery initramfs image in it and performing SWUpdate update from a USB drive.

QEMU SPI NOR flash with SWUpdate recovery

In the QEMU Custom SPI peripheral post the support for SPI controller for Cubieboard was introduced. A custom SPI peripheral was developed to demonstrate basic functionality. QEMU comes with out-of-th ...

Making initramfs image with Yocto
Post about creating an initramfs image with Yocto. This image can be used as a base for tasks that can benefit from having a compact rootfs loaded together with the kernel, like having a recovery in SWUpdate.

Making initramfs image with Yocto

Embedded systems can have different types of persistent (non-volatile) storage, like eMMC, SD card, NOR or NAND flash memory. Each storage type has advantages and disadvantages with regards to the rea ...

Custom SPI peripheral in QEMU
Instructions on creating a new SPI peripheral in QEMU, as well as adding userspace software support for it, and testing the complete setup.

Custom SPI peripheral in QEMU

In previous posts the process for creating a custom memory mapped and I2C peripheral in QEMU was shown. In this post we will go through the process of creating a new SPI peripheral, and userspace supp ...

SWUpdate for Cubieboard QEMU
Details on adding Over-the-Air update for Cubieboard QEMU using SWUpdate. The support is integrated using Yocto.

SWUpdate for Cubieboard QEMU

Software update is an important part of design of modern embedded systems. It allows faster time to market, since fixes, security or stability updates or even new features can be pushed to the devices ...

Integrating support for custom QEMU peripherals in Yocto
Details on adding new MACHINE to Yocto, in order to support custom memory-mapped and i2c devices.

Integrating support for custom QEMU peripherals in Yocto

In the previous posts a custom memory-mapped peripheral was introduced, together with the Linux device driver for it and a userspace application which can be used to interact with it. Besides the memo ...

Custom I2C peripheral in QEMU
Instructions on creating a new I2C peripheral in QEMU, as well as adding userspace software support for it, and testing the complete setup.

Custom I2C peripheral in QEMU

QEMU supports creating various peripherals, not only the memory-mapped shown in previous posts. In this post we will go through the process of creating a new I2C peripheral, and userspace support for ...

Userspace application for QEMU custom memory-mapped device
Third part of Linux Device Driver Development using QEMU, which describes steps for creating a userspace application that uses previously developed driver to interact with the custom component that was described in first post.

Userspace application for QEMU custom memory-mapped device

This is part 3 of the Linux device driver development post series. In the previous post the structure of a Linux device driver for the custom memory-mapped peripheral in QEMU was shown. In this post w ...

Linux Device Driver for QEMU custom memory-mapped device
Second part of Linux Device Driver Development using QEMU, which describes steps for creating a Linux device driver for the custom component that was described in first post.

Linux Device Driver for QEMU custom memory-mapped device

This is part 2 of the Linux device driver development post series. In the previous post the steps for creating a custom memory-mapped peripheral in QEMU were presented. In this post following items wi ...

Yocto for Cubieboard in QEMU - Step-by-step
Detailed introduction to building Yocto image for Cubieboard and testing in QEMU

Yocto for Cubieboard in QEMU - Step-by-step

In the previous post Ubuntu was used as root filesystem. Using Ubuntu as root filesystem is simple and fast to use, but it also has a lot of packages which are not necessary. In this post I will cover ...

Yocto for Cubieboard in QEMU
Short introduction to building Yocto image for Cubieboard and testing in QEMU

Yocto for Cubieboard in QEMU

Root filesystem options The root filesystem is an important part of the BSP (Board Support Package), since it holds all of the applications, configuration files and kernel modules. There are several w ...

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