Mistra Solutions

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The Mistra Solutions site contains different tutorials and blog posts related to various embedded software topics: QEMU, Embedded Linux, Yocto, U-Boot, RTOS, GUI, etc.

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.

March 30, 2025
- Tutorial

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 read/write speed, cost per amount of data that can be stored, number of write cycles, etc. The non-volatile memory is needed to store the root filesystem, as well as certain configuration data. The roo ...

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

October 20, 2024
- Tutorial

Custom SPI peripheral in QEMU

In previous posts the process for creating a custom [memory mapped](../ldd-custom-qemu-device/) and [I2C](../qemu-custom-i2c-peripheral/) peripheral in QEMU was shown. In this post we will go through the process of creating a new SPI peripheral, and userspace support for it. The following things will be covered - [SPI support for Cubieboard in QEMU](#spi-support-for-cubieboard-in-qemu) - [Custo ...

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