Kernel Recipes 2018 - Is Video4Linux ready for all cutting-edge hardware? - Ezequiel Garcia
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This document discusses whether the Video4Linux (V4L) APIs are ready to support cutting-edge hardware. It begins with an overview of the current V4L2 APIs and introduces new APIs being developed to support stateful and stateless codecs as well as fences and asynchronous USB video class (UVC). While progress has been made supporting new features, the document concludes that V4L is not fully ready yet for all modern hardware.
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The IoT is becoming extremely popular keyword in the industries while there are many different interpretations or various definitions. However, one common requirement is that it requires many Sensor devices connected to Linux devices. The user space drivers for GPIO, I2C/SPI and UART sensors in the past were implemented separately from scratch delicately for each product. This will cause significant challenge of software engineering overhead while GPIO, I2C/SPI and UART sensors are dramatically increasing which have to be supported. The IoTDK is one of the library to provide portability of sensors' driver to solve the situation.
The talk will includes guide of IoTDK and 96Boards and tutorial of programing I2C and GPIO devices. Targeted audiences are who are interested in IoT sensors or who would like to move from Arduino and Raspberry Pi to modern ARM CPU effectively.
This presentation was delivered at LinuxCon Japan 2016 by Akira Tsukamoto.
Zephyr Introduction - Nordic Webinar - Sept. 24.pdf
West is a command line tool that manages Zephyr projects. It initializes workspaces, updates repositories, and provides commands for common development tasks like building, flashing, and debugging. West separates the core tool functionality from Zephyr-specific extensions, allowing it to manage multiple projects. When initializing a workspace, West clones the main Zephyr repository and any dependencies, creating a reproducible development environment.
“A New, Open-standards-based, Open-source Programming Model for All Accelerat...
“A New, Open-standards-based, Open-source Programming Model for All Accelerat...Edge AI and Vision Alliance
For the full video of this presentation, please visit: https://www.edge-ai-vision.com/2023/07/a-new-open-standards-based-open-source-programming-model-for-all-accelerators-a-presentation-from-codeplay-software/
Charles Macfarlane, Chief Business Officer at Codeplay Software, presents the “New, Open-standards-based, Open-source Programming Model for All Accelerators” tutorial at the May 2023 Embedded Vision Summit.
As demand for AI grows, developers are attempting to squeeze more and more performance from accelerators. Ideally, developers would choose the accelerators best suited to their applications. Unfortunately, today many developers are locked into limited hardware choices because they use proprietary programming models like NVIDIA’s CUDA. The oneAPI project was launched to create an open specification and open-source software that enables developers to write software using standard C++ code and deploy to GPUs from multiple vendors.
OneAPI is an open-source ecosystem based on the Khronos open-standard SYCL with libraries for enabling AI and HPC applications. OneAPI-enabled software is currently deployed on numerous supercomputers, with plans to extend into other market segments. OneAPI is evolving rapidly and the whole community of hardware and software developers is invited to contribute. In this presentation, Macfarlane introduces how oneAPI enables developers to write multi-target software and highlights opportunities for developers to contribute to making oneAPI available for all accelerators.IFB cloud: Integration of snakemake workflows in an appliance designed for Ch...
The document describes the IFB cloud, a French national bioinformatics infrastructure that provides computing resources and appliances. It summarizes the current and planned capacity of the IFB cloud. It then describes a ChIP-seq analysis appliance available on the IFB cloud, which contains tools like snakemake, NGS tools, and example ChIP-seq workflows. It provides instructions for requesting an account, launching a virtual disk and instance, connecting via SSH, loading data, and executing workflows on the appliance using the snakemake framework.
RISC-V Summit 2019: Next-generation IDE for your RISC-V Product in 20 Minutes
VIDEO: https://www.youtube.com/watch?v=0eYDKION0Bs
5 years ago I founded PlatformIO to solve the problem of multi-platform development in the embedded systems industry. Our unique philosophy gives embedded developers true freedom – personally decide which operating system, integrated development environment, and hardware to use. No more lock-ins to the specific semiconductor toolchains. One open-source ecosystem – multiple architectures, development platforms, and processor families!
At PlatformIO, we believe the embedded systems industry desperately needs reinvention. Not only are the IDEs and tools built with technology from the 1990s, but the complex requirements for embedded engineers.
We are using modern technology to re-imagine and re-build core components of embedded infrastructure from the ground up. We’re focusing on improving the lives of everyday engineers with a free, open-source, and next-generation tools for professional development.
BUD17-405: Building a reference IoT product with Zephyr
"Session ID: BUD17-405
Session Name: Building a reference IoT product with Zephyr - BUD17-405
Speaker: Michael Scott, Ricardo Salveti
Track: LTD
★ Session Summary ★
An example of a reference IoT product can be thought of supporting several core technologies such as IPv4/IPv6, 6LoWPAN, Bluetooth LE and also several protocols such as MQTT, CoAP and LWM2M. Additional requirements such as having a complete secure boot and execution environment, besides being able to be securely updated with FOTA support are also critically important. This session will cover the development and challenges faced when producing a reference IoT product implementation with Zephyr, describing the state of the project, and the current gaps to productization.
---------------------------------------------------
★ Resources ★
Event Page: http://connect.linaro.org/resource/bud17/bud17-405/
Presentation: https://www.slideshare.net/linaroorg/bud17405-building-a-reference-iot-product-with-zephyr
Video: https://youtu.be/TOJkzIJ_3jg
---------------------------------------------------
★ Event Details ★
Linaro Connect Budapest 2017 (BUD17)
6-10 March 2017
Corinthia Hotel, Budapest,
Erzsébet krt. 43-49,
1073 Hungary
---------------------------------------------------
Keyword: LTD, Zephyr. IoT
http://www.linaro.org
http://connect.linaro.org
---------------------------------------------------
Follow us on Social Media
https://www.facebook.com/LinaroOrg
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Kernel Recipes 2019 - Driving the industry toward upstream first
This document discusses the benefits of contributing device drivers and other code to the Linux kernel upstream first instead of maintaining private branches. It outlines Chrome OS's strategy of picking long-term stable kernels and contributing hardware support to upstream. While challenging, working upstream provides many benefits like free code reviews, bugfixes, and easier updates. The document shows that Chrome OS contributions have helped increase upstream support for vendors' devices and that there is still work remaining to upstream GPU and other drivers. It demos mainlining the Samsung Chromebook Plus by using the open source Panfrost GPU driver instead of a vendor driver.
Kernel Recipes 2019 - No NMI? No Problem! – Implementing Arm64 Pseudo-NMI
As the name would suggest, a Non-Maskable Interrupt (NMI) is an interrupt-like feature that is unaffected by the disabling of classic interrupts. In Linux, NMIs are involved in some features such as performance event monitoring, hard-lockup detector, on demand state dumping, etc… Their potential to fire when least expected can fill the most seasoned kernel hackers with dread.
AArch64 (aka arm64 in the Linux tree) does not provide architected NMIs, a consequence being that features benefiting from NMIs see their use limited on AArch64. However, the Arm Generic Interrupt Controller (GIC) supports interrupt prioritization and masking, which, among other things, provides a way to control whether or not a set of interrupts can be signaled to a CPU.
This talk will cover how, using the GIC interrupt priorities, we provide a way to configure some interrupts to behave in an NMI-like manner on AArch64. We’ll discuss the implementation, some of the complications that ensued and also some of the benefits obtained from it.
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Kernel Recipes 2019 - Hunting and fixing bugs all over the Linux kernel
At a rate of almost 9 changes per hour (24/7), the Linux kernel is definitely a scary beast. Bugs are introduced on a daily basis and, through the use of multiple code analyzers, *some* of them are detected and fixed before they hit mainline. Over the course of the last few years, Gustavo has been fixing such bugs and many different issues in every corner of the Linux kernel. Recently, he was in charge of leading the efforts to globally enable -Wimplicit-fallthrough; which appears by default in Linux v5.3. This presentation is a report on all the stuff Gustavo has found and fixed in the kernel with the support of the Core Infrastructure Initiative.
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Kernel Recipes 2019 - Metrics are money
In I.T. we all use all kinds of metrics. Operations teams rely heavily on these, especially when things go south. These metrics are sometimes overrated. Let’s dive into a few real life stories together.
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Kernel Recipes 2019 - Kernel documentation: past, present, and future
This document discusses the current state and future plans for Linux kernel documentation. It notes that documentation has transitioned from DocBook to Sphinx/RST, improving formatting and integration. There are now over 3,000 documentation files and many kerneldoc comments. Future plans include converting remaining text files, updating ancient documents, improving organization by topic, integrating documentation better, and enhancing the documentation toolchain. The goal is to improve documentation to better help kernel developers, users and the community.
Embedded Recipes 2019 - Knowing your ARM from your ARSE: wading through the t...
Modern SoC designs incorporate technologies from numerous vendors, each with their own inconsistent, confusing, undocumented and even contradictory terminology. The result is a mess of acronyms and product names which have a surprising impact on the ability to develop reusable, modular code thanks to the nature of the underlying IP being obscured.
This presentation will dive into some of the misnomers plaguing the Arm ecosystem, with the aim of explaining why things are like they are, how they fit together under the architectural umbrella and how you, as a developer, can decipher the baffling ingredients list of your next SoC design!
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Kernel Recipes 2019 - GNU poke, an extensible editor for structured binary data
GNU poke is a new interactive editor for binary data. Not limited to editing basic ntities such as bits and bytes, it provides a full-fledged procedural, interactive programming language designed to describe data structures and to operate on them. Once a user has defined a structure for binary data (usually matching some file format) she can search, inspect, create, shuffle and modify abstract entities such as ELF relocations, MP3 tags, DWARF expressions, partition table entries, and so on, with primitives resembling simple editing of bits and bytes. The program comes with a library of already written descriptions (or “pickles” in poke parlance) for many binary formats.
GNU poke is useful in many domains. It is very well suited to aid in the development of programs that operate on binary files, such as assemblers and linkers. This was in fact the primary inspiration that brought me to write it: easily injecting flaws into ELF files in order to reproduce toolchain bugs. Also, due to its flexibility, poke is also very useful for reverse engineering, where the real structure of the data being edited is discovered by experiment, interactively. It is also good for the fast development of prototypes for programs like linkers, compressors or filters, and it provides a convenient foundation to write other utilities such as diff and patch tools for binary files.
This talk (unlike Gaul) is divided into four parts. First I will introduce the program and show what it does: from simple bits/bytes editing to user-defined structures. Then I will show some of the internals, and how poke is implemented. The third block will cover the way of using Poke to describe user data, which is to say the art of writing “pickles”. The presentation ends with a status of the project, a call for hackers, and a hint at future works.
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Kernel Recipes 2019 - Analyzing changes to the binary interface exposed by th...
Operating system distributors often face challenges that are somewhat different from that of upstream kernel developers. For instance, some kernel updates often need to stay at least binary compatible with modules that might be “out of tree” for some time.
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The Libabigail framework is capable of analyzing ELF binaries along with their accompanying debug info in the DWARF format, detect and report changes in types, functions, variables and ELF symbols. It has historically supported that for user space shared libraries and application so we worked to make it understand the Linux kernel
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Embedded Recipes 2019 - Remote update adventures with RAUC, Yocto and Barebox
Different upgrade and update strategies exist when it comes to embedded Linux system. If at development time none of these strategies have been chosen, adding them afterwards can be tedious task.
Even harder it gets when the system is already deployed in the field and only accessible via a 3G connection.
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Embedded Recipes 2019 - Making embedded graphics less special
Open-source graphics drivers are helping to make embedded systems less specialized by standardizing interfaces like KMS, DRI, and Mesa. Mesa provides implementations of graphics APIs like OpenGL and Vulkan via drivers for different GPUs. Combined with Wayland, this allows applications to run on embedded systems like a modern Linux desktop without platform-specific code. Current open-source drivers like Freedreno, Etnaviv, and Panfrost support GPUs from vendors like Qualcomm and ARM and are under active development by their respective communities.
Embedded Recipes 2019 - Linux on Open Source Hardware and Libre Silicon
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The I2C subsystem is not the shiniest part of the Linux Kernel. For embedded devices, though, it is one of the many puzzle pieces which just have to work. Wolfram Sang has the experience of maintaining this subsystem for nearly 7 years now. This talk gives a short overview of how maintaining works in general and specifically in this subsystem. But mainly, it will highlight noteworthy points in the timeline and lessons learnt from that. It will present trends, not so much regarding I2C but more the Linux Kernel and the embedded ecosystem in general. And of course, there will be plenty of anecdotes and bits from behind the scenes for your entertainment.
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Embedded Recipes 2019 - Testing firmware the devops way
ITRenew is selling recertified OCP servers under the Sesame brand, those servers come either with their original UEFI BIOS or with LinuxBoot. The LinuxBoot project is pushing the Linux kernel inside bios flash and using userland programs as bootloader.
To achieve quality on our software stack, as any project, we need to test it. Traditional BIOS are tested by hand, this is 2019 we need to do it automatically! We already presented the hardware setup behind the LinuxBoot CI, this talk will focus on the software.
We use u-root for our userland bootloader; this software is written in Go so we naturally choose to use Go for our testing too. We will present how we are using and extending the Go native test framework `go test` for testing embedded systems (serial console) and improving the report format for integration to a CI.
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Embedded Recipes 2019 - Herd your socs become a matchmaker
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- How device trees improved the situation by providing a standardized hardware description and stable ABI, separating this from OS configuration.
- Best practices for designing compatible value schemes and supporting a variety of similar devices across SoC families in device trees and drivers.
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Embedded Recipes 2019 - LLVM / Clang integration
This document discusses the integration of LLVM and Clang into Buildroot. It provides an overview of LLVM and Clang, the objectives of integrating them into Buildroot, and the initial integration work done. It then covers cross-compiling Linux with Clang and some conclusions. Some key points include:
- LLVM is an open source compiler infrastructure that includes the Clang C/C++ compiler. It uses an intermediate representation and focuses on compile time and code generation performance.
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Embedded Recipes 2019 - Introduction to JTAG debugging
This talk introduces JTAG debugging capabilities, both for debugging hardware and software. Marek first explains what the JTAG stands for and explains the operation of the JTAG state machine. This is followed by an introduction to free software JTAG tools, OpenOCD and urJTAG. Marek shortly explains how to debug software using those tools and how that ties into the JTAG state machine. However, JTAG was designed for testing hardware. Marek explains what boundary scan testing (BST) is, what are BSDL files and their format, and practically demonstrates how to blink an LED using BST and only free software tools.
Marek Vasut
Embedded Recipes 2019 - Pipewire a new foundation for embedded multimedia
PipeWire is an open source project that aims to greatly improve audio and video handling under Linux. Utilising a fresh design, it bridges use cases that have been previously addressed by different tools – or not addressed at all -, providing ground for building complex, yet secure and efficient, multimedia systems.
In this talk, Julien is going to present the PipeWire project and the concepts that make up its design. In addition, he is going to give an update of the current and future work going on around PipeWire, both upstream and in Automotive Grade Linux, an early adopter that Julien is actively working on.
Julian Bouzas
Kernel Recipes 2019 - ftrace: Where modifying a running kernel all started
The document describes the ftrace function tracing tool in Linux kernels. It allows attaching to functions in the kernel to trace function calls. It works by having the GCC compiler insert indirect function entry calls. These calls are recorded during linking and replaced with nops at boot time for efficiency. This allows function tracing with low overhead by tracing the indirect function entry calls.
Kernel Recipes 2019 - Suricata and XDP
Suricata is a network threat detection engine using network packets capture to reconstruct the traffic till the application layer and find threats on the network using rules that define behavior to detect. This task is really CPU intensive and discarding non interesting traffic is a solution to enable a scaling of Suricata to 40gbps and other.
This talk will present the latest evolution of Suricata that knows uses eBPF and XDP to bypass traffic. Suricata 5.0 is supporting the hardware XDP to provide ypass with network card such as Netronome. It also takes advantage of pinned maps to get persistance of the bypassed flows. This talk will cover the different usage of XDP and eBPF in Suricata and shows how it impact performance and usability. If development time permit, the talk will also cover AF_XDP and the impact on this new capture method on Suricata.
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Kernel Recipes 2019 - Marvels of Memory Auto-configuration (SPD)
System memory configuration is a transparent operation nowadays, something that we all came to expect to just work out of the box. Still, it does happen behind the scenes every single time we boot our computers. This requires the cooperation of hardware components on the mainboard and on memory modules themselves, as well as firmware code to drive these. While it is possible to just let it happen, having a deeper understanding of how it works makes it possible to access valuable information from the operating system at run-time.
I will take you through the history of system memory configuration from the mid 70s to now. We will explore the different types of memory modules, how their configuration data is stored and how the firmware can access them. We will see which problems had to be solved along the way and how they were solved. Lastly we will see how Linux supports reading the memory configuration information and what you can do with that information.
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Embedded Recipes 2019 - Pipewire a new foundation for embedded multimedia
Kernel Recipes 2019 - ftrace: Where modifying a running kernel all started
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- 1. Is Video4Linux ready for all cutting-edge hardware? Ezequiel Garcia ezequiel@collabora.com
- 2. 2 Is Video4Linux ready for all cutting-edge hardware?
- 3. 3 Is Video4Linux ready for all cutting-edge hardware? tl;dr: no
- 4. 4 Agenda ● Traditional V4L APIs ● New APIs ● The future
- 6. 6 V4L2 API ● VIDIOC_{ENUM_TRY,G,S}_FMT ● VIDIOC_{G,S}_STD, VIDIOC_QUERYSTD ● VIDIOC_REQBUFS ● VIDIOC_QBUF, VIDIOC_DQBUF ● VIDIOC_STREAMON, VIDIOC_STREAMOFF and more...
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- 8. 8 Codecs
- 9. 9 Stateful codecs ● Device handle full bitstream, so drivers shouldn’t do any parsing. Performing software stream processing, header generation etc. in the driver is strongly discouraged. ● Uses the traditional V4L (stream-based) API. ● Specification in progress: [PATCH 0/2] Document memory-to-memory video codec interfaces
- 10. 10 Stateful codecs ● Platforms with stateful codecs in mainline – i.MX – QCOM – Exynos – Mediatek – and more...
- 12. 12 Stateless codecs ● Device accelerates the encoding/decoding job. ● Device handles raw compressed bitstreams, but needs software to do the extra parsing. ● Uses the Request (slice-based) API. ● Specification also in progress: [RFC PATCH] media: docs-rst: Document m2m stateless video decoder interface
- 14. 14 Stream API
- 15. 15 Request API
- 16. 16 Request API
- 17. 17 Request API
- 18. 18 What does the future look?
- 19. 19 Fences ● Attaching in-fences and out-fences to buffers can reduce latency and improve efficiency. ● Work in-progress by Gustavo Padovan and Ezequiel Garcia: [PATCH v10 00/16] V4L2 Explicit Synchronization
- 21. 21 With Fences
- 22. 22 Async UVC ● High-quality devices require more bandwidth from USB controllers and drivers. ● Multi-core SoCs capable of processing USB packets in parallel. ● Work by Kieran Bingham from Ideas on Board: [RFC/RFT PATCH 0/6] Asynchronous UVC
- 23. 23 Async UVC (before) static void uvc_video_complete(struct urb *urb) { [..] /* copy payload */ stream->decode(urb, stream, buf, buf_meta); if ((ret = usb_submit_urb(urb, GFP_ATOMIC)) < 0) { /* error handling */ } }
- 24. 24 Async UVC (after) static void uvc_video_complete(struct urb *urb) { [..] /* only process headers */ stream->decode(uvc_urb, buf, buf_meta); [..] INIT_WORK(&uvc_urb->work, uvc_video_copy_data_work); queue_work(stream->async_wq, &uvc_urb->work); }
- 25. 25 Thank you!