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101 Essentials - Embedded Linux [clear filter]
Monday, October 26

12:00 GMT

Tutorial: From an Idea to a Patch in the Linux Mainline - Marta Rybczynska, Various Projects
In the tutorial we're going to cover the basics of Linux kernel development, from the idea (or a bug found!) to the change integrated into the Linux mainline. We'll start from setting up the environment: the Linux kernel source, the compiler and debugger. Options like embedded debugger and using virtual machines in case of kernel crashes will be taken into account too. Then we'll cover the implementation of the patch, showing where to look for the information about APIs, how to correctly use the Linux coding style and write patch descriptions. The audience will also learn about the unit test mechanism and testing in the kernel in general. Then we're going to move to the process of getting the patch to the mainline: starting from where and how to send it. One of the scary points for new developers is the review process and we're going to demystify it. As a bonus, we'll show how to make maintainers happy and build a good opinion about you and your work. Pre-requirements: C coding, usage of Makefiles. No previous Linux kernel development experience necessary.

avatar for Marta Rybczynska

Marta Rybczynska

Open Source Enthusiast, Various Projects
Marta Rybczynska has network security background and 15 years of experience in embedded development. She has been working with embedded operating systems like Linux and various real-time ones, system libraries and frameworks up to user interfaces. Her specialties are architecture-specific... Read More →

Monday October 26, 2020 12:00 - 13:50 GMT
101 Essentials Theater
  101 Essentials - Embedded Linux, Kernel Basics
Tuesday, October 27

12:00 GMT

Demystifying Linux Kernel Initcalls! - Mylène Josserand, Collabora
__initcalls are a very useful mechanism of the kernel boot process, it allows the developer to easily hook their code as part of the kernel boot process. This talk will demystify the magic behind kernel initcalls, look at the purpose and benefits, how they are implemented and finally cover ways to debug and trace them. You would be amazed, for example, by how much insight of a device's boot-time you can get by looking at how and when the initcalls are being executed.


Mylène Josserand

Embedded Linux engineer, Collabora
Mylène Josserand joined Collabora as a Consultant Software Engineer. She has experiences in embedded Linux and kernel development. She worked on drivers and BSP development with Buildroot and the Yocto project / Open Embedded, contributing new features and fixes to these projects... Read More →

Tuesday October 27, 2020 12:00 - 12:50 GMT
101 Essentials Theater

14:15 GMT

Tutorial: What The Clock! - Linux Clock Subsystem Internals - Neil Armstrong, BayLibre SAS
But what are these "Clocks" stuff I see in the kernel about ? Since first introduction of linux/clk.h in 2006 from Russel King, clock management was progressively part of the needed system management and resource handling in drivers. Then, in 2012, Mike Turquette introduced the "Common Clock Framework" he co-maintained with Steven Boyd, becoming a central "Framework" handling clocks over the system to provide controls by the device drivers. However, what are these clocks? What are they in physical terms? How are they modeled in Hardware? Why do we need them to control internal&external devices? Neil will make a full overview of the "Common Clock Framework", how it's integrated in the Linux Kernel and a brief overview of the physical implementation&requirement in Hardware.

avatar for Neil Armstrong

Neil Armstrong

Embedded Linux Engineer, BayLibre SAS
Embedded Linux Engineer since 2008, Neil worked on designing and supporting small in-house designed SoCs for Digital TV Content Protection, Set-Top-Box or Security Co-Processor, and is now Embedded Linux Expert in the Baylibre team. He ports, maintains and upstreams Linux support... Read More →

Tuesday October 27, 2020 14:15 - 15:45 GMT
101 Essentials Theater

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