Bazel's aspects are next to rules the major building block used to extend the functionality of your build system. Contrary to rules, aspects allow to run particular functionality over an existing dependency graph. Aspect are documented pretty well on the bazel documentation page: Aspects | BazelBazelLet's build on top of the…
All the code that you can read below, can be found under: https://github.com/ltekieli/custom-oe-distro OpenEmbedded, Yocto, bitbake confusion.I have to admit that Yocto and OpenEmbedded were always quite confusing in terms of what is what, especially looking at the history of both and the integration decisions…
This time a short introduction to Bazel and how to cross-compile with this tool. I will explain how to build for host platform, as well as for multiple different targets. You can get the partial repositories used in this exercise here. Installing Bazelisk I highly recommend using Bazelisk for managing…
So previously I shortly introduced how to build a custom toolchain, now it's time to put it to use. A bare toolchain is rarely sufficient enough to build useful applications. We usually depend on external libraries, whether it's boost, protobuf or any other piece of code. This time, let's use…
crosstool-ng is a handy tool for obtaining custom gcc toolchains which are tailored to your needs. This is especially useful when you are up to building a custom system for your embedded device, like a raspberry pi or a beagleboard. Building crosstool-ng itself crosstool-ng can be obtained in binary form,…
Automation is an important part of every software project. If you need to do something repeatedly, chances are, that it can be easily put in a script and done for you. It is especially important in build systems, that is why I would like to automate all the steps, that…
Raspberry Pi has a fairly complicated boot process with two bootloaders. The first one resides in built-in ROM and is responsible for starting the GPU. The GPU executes bootcode.bin, the second bootloader, which in the end runs the kernel. Although, there is a possibility to have the root file…
Recently, I started to dig into the topic of Linux kernel, especially from the embedded point of view. I got a chance to explore the operating system, its configuration and build process at Nokia, where I currently work. I decided to shift this exploration to a different kind of hardware.…