This document discusses various hardware and software issues that can occur from power-on to operating system boot, and potential solutions. It covers topics like bootloaders, kernel porting, workarounds for hardware issues, and reimplementing functionality in software when hardware has errors. The document provides examples of specific issues like camera problems and touchscreen false presses, and how software workarounds were developed to address them.
Enabling TPM 2.0 on coreboot based devicesPiotr Król
This talk was presented during European coreboot Conference 2017 in Bochum. In this talk we walk through procedures required for enabling TPM 2.0 using LPC interface. We implemented that support as part of our ongoing maintainances of PC Engines apu series (AMD G-series) platform.
Video is available here: https://youtu.be/Yjb9n5p3giI
The presentation discusses TPM 2.0 support in Qubes OS and Linux kernel in general. Show the results of Qubes OS HCL report, analyze possible use cases for TPM in Qubes OS and other Linux distributions.
Enabling TPM 2.0 on coreboot based devicesPiotr Król
This talk was presented during European coreboot Conference 2017 in Bochum. In this talk we walk through procedures required for enabling TPM 2.0 using LPC interface. We implemented that support as part of our ongoing maintainances of PC Engines apu series (AMD G-series) platform.
Video is available here: https://youtu.be/Yjb9n5p3giI
The presentation discusses TPM 2.0 support in Qubes OS and Linux kernel in general. Show the results of Qubes OS HCL report, analyze possible use cases for TPM in Qubes OS and other Linux distributions.
The goal of this test plan is to test SPECTRE and MELTDOWN performance impact on Intel CPU. We will run CPU intensive workloads in Virtual Machine(s) running on non-patched and patched ESXi host and observe performance impact.
We will test impact on network, storage and memory performance because these I/O intensive workloads requires CPU caching which is impacted by vulnerabilities remediation.
Qualification of performance is very specific and hard subject. The performance impact varies across different hardware and software configurations. However, performed tests are very well described in this document so the reader can understand all conditions of the test and observed results. The reader can also perform tests on his specific hardware and software configurations.
Evolution of ota_update_in_the_io_t_worldStefano Babic
The update of the software in an embedded Linux System has gained importance and it is nowadays an essential part of any product. But upgrading an embedded system in field is a complex task and must be robust and secure. The increasing number of devices connected to a public network has led to new features and requirements that a FOSS update agent must fill - Stefano is author and Maintainer of the FOSS project "SWUpdate" - a framework to build an own update strategy. In this presentation, it will be pointed out to the new requirements coming from the industry about an updater and he will show which direction the project will take in future.
Android è un argomento di grande interesse nel mondo dell'informatica ma lavorare sulla piattaforma non è semplice.
Questo intervento avrà un taglio pratico e spiegherà come procurarsi gli strumenti per compilare un modulo kernel su android, come sviluppare un semplice modulo e come caricarlo sul dispositivo. Infine, si presenterà come creare un modulo più complesso usando delle API specifiche del kernel di Android.
I sorgenti del workshop sono reperibili qui:
https://github.com/arighi/mysuspend
Defeating x64: Modern Trends of Kernel-Mode RootkitsAlex Matrosov
Versions of Microsoft Windows 64 bits were considered resistant against kernel mode rootkits because integrity checks performed by the system code. However, today there are examples of malware that use methods to bypass the security mechanisms Implemented. This presentation focuses on issues x64 acquitectura security, specifically in the signature policies kernel mode code and the techniques used by modern malware to sauté. We analyze the techniques of penetration of the address space of kernel mode rootkits used by modern in-the-wild: - Win64/Olmarik (TDL4) - Win64/TrojanDownloader.Necurs (rootkit dropper) - NSIS / TrojanClicker.Agent.BJ (rootkit dropper) special attention is given to bootkit Win64/Olmarik (TDL4) for being the most prominent example of a kernel mode rootkit aimed at 64-bit Windows systems. Detail the remarkable features of TDL4 over its predecessor (TDL3/TDL3 +): the development of user mode components and kernel mode rootkit techniques used to bypass the HIPS, hidden and system files as bootkit functionality. Finally, we describe possible approaches to the removal of an infected computer and presents a free forensics tool for the dump file system hidden TDL.
HKG18-TR14 - Postmortem Debugging with CoresightLinaro
Session ID: HKG18-TR14
Session Name: HKG18-TR14 - Postmortem Debugging with Coresight
Speaker: Leo Yan
Track: Training
★ Session Summary ★
For most cases we can easily debug with kernel's oops dumping info, but sometimes we need to know more information for program execution flow before the issue happens. So we can rely on two tracing methods to reproduce the program execution flow, one method is using software tracing which is kernel's pstore method; another method is to rely on Coresight hardware tracing, this method also can avoid extra workload introduced by tracing itself. Coresight has provided two mechanisms for Postmortem debugging, one method is Coresight CPU debug module so we can extract CPU program counter info, this is quite straightforward to debug CPU lockup issue; Another is Coresight panic kdump, we connect kernel kdump mechanism to extract Coresight tracing data so we can reproduce the last execution flow before panic (even hang issue with some tweaking in kernel). This session wants to go through these topics and demonstrate the debugging tools on 96boards Hikey in 25 minutes session.
---------------------------------------------------
★ Resources ★
Event Page: http://connect.linaro.org/resource/hkg18/hkg18-tr14/
Presentation: http://connect.linaro.org.s3.amazonaws.com/hkg18/presentations/hkg18-tr14.pdf
Video: http://connect.linaro.org.s3.amazonaws.com/hkg18/videos/hkg18-tr14.mp4
---------------------------------------------------
★ Event Details ★
Linaro Connect Hong Kong 2018 (HKG18)
19-23 March 2018
Regal Airport Hotel Hong Kong
---------------------------------------------------
Keyword: Training
'http://www.linaro.org'
'http://connect.linaro.org'
---------------------------------------------------
Follow us on Social Media
https://www.facebook.com/LinaroOrg
https://www.youtube.com/user/linaroorg?sub_confirmation=1
https://www.linkedin.com/company/1026961
Přednáška zaměřená na rychlý přehled nových technologií v operačním systému Windows 10 a nových mikroarchitekturách procesorů Intel (Haswell, Sky Lake a Kaby Lake). Detailněji se pak bude věnovat některým klíčovým novinkám jako je virtual based security ve Windows 10, nebo některým bezpečnostním rozšířením procesorů. Závěrem poskytne přehled zdrojů k detailním informacím a příkladům využití. Přednáška bude koncipována jako "svodka technologických novinek". Autor bude přítomný po celou dobu konání konference a rád odpoví na Vaše otázky.
This presentation is about U-Boot: the most popular open source, primary boot loader used in embedded devices, as well as it's mechanisms and features.
The respective talk was held by Sam Protsenko (Software Engineer, Consultant, GlobalLogic) at GlobalLogic Mykolaiv Embedded TechTalk #1 on May 25, 2018.
The goal of this test plan is to test SPECTRE and MELTDOWN performance impact on Intel CPU. We will run CPU intensive workloads in Virtual Machine(s) running on non-patched and patched ESXi host and observe performance impact.
We will test impact on network, storage and memory performance because these I/O intensive workloads requires CPU caching which is impacted by vulnerabilities remediation.
Qualification of performance is very specific and hard subject. The performance impact varies across different hardware and software configurations. However, performed tests are very well described in this document so the reader can understand all conditions of the test and observed results. The reader can also perform tests on his specific hardware and software configurations.
Evolution of ota_update_in_the_io_t_worldStefano Babic
The update of the software in an embedded Linux System has gained importance and it is nowadays an essential part of any product. But upgrading an embedded system in field is a complex task and must be robust and secure. The increasing number of devices connected to a public network has led to new features and requirements that a FOSS update agent must fill - Stefano is author and Maintainer of the FOSS project "SWUpdate" - a framework to build an own update strategy. In this presentation, it will be pointed out to the new requirements coming from the industry about an updater and he will show which direction the project will take in future.
Android è un argomento di grande interesse nel mondo dell'informatica ma lavorare sulla piattaforma non è semplice.
Questo intervento avrà un taglio pratico e spiegherà come procurarsi gli strumenti per compilare un modulo kernel su android, come sviluppare un semplice modulo e come caricarlo sul dispositivo. Infine, si presenterà come creare un modulo più complesso usando delle API specifiche del kernel di Android.
I sorgenti del workshop sono reperibili qui:
https://github.com/arighi/mysuspend
Defeating x64: Modern Trends of Kernel-Mode RootkitsAlex Matrosov
Versions of Microsoft Windows 64 bits were considered resistant against kernel mode rootkits because integrity checks performed by the system code. However, today there are examples of malware that use methods to bypass the security mechanisms Implemented. This presentation focuses on issues x64 acquitectura security, specifically in the signature policies kernel mode code and the techniques used by modern malware to sauté. We analyze the techniques of penetration of the address space of kernel mode rootkits used by modern in-the-wild: - Win64/Olmarik (TDL4) - Win64/TrojanDownloader.Necurs (rootkit dropper) - NSIS / TrojanClicker.Agent.BJ (rootkit dropper) special attention is given to bootkit Win64/Olmarik (TDL4) for being the most prominent example of a kernel mode rootkit aimed at 64-bit Windows systems. Detail the remarkable features of TDL4 over its predecessor (TDL3/TDL3 +): the development of user mode components and kernel mode rootkit techniques used to bypass the HIPS, hidden and system files as bootkit functionality. Finally, we describe possible approaches to the removal of an infected computer and presents a free forensics tool for the dump file system hidden TDL.
HKG18-TR14 - Postmortem Debugging with CoresightLinaro
Session ID: HKG18-TR14
Session Name: HKG18-TR14 - Postmortem Debugging with Coresight
Speaker: Leo Yan
Track: Training
★ Session Summary ★
For most cases we can easily debug with kernel's oops dumping info, but sometimes we need to know more information for program execution flow before the issue happens. So we can rely on two tracing methods to reproduce the program execution flow, one method is using software tracing which is kernel's pstore method; another method is to rely on Coresight hardware tracing, this method also can avoid extra workload introduced by tracing itself. Coresight has provided two mechanisms for Postmortem debugging, one method is Coresight CPU debug module so we can extract CPU program counter info, this is quite straightforward to debug CPU lockup issue; Another is Coresight panic kdump, we connect kernel kdump mechanism to extract Coresight tracing data so we can reproduce the last execution flow before panic (even hang issue with some tweaking in kernel). This session wants to go through these topics and demonstrate the debugging tools on 96boards Hikey in 25 minutes session.
---------------------------------------------------
★ Resources ★
Event Page: http://connect.linaro.org/resource/hkg18/hkg18-tr14/
Presentation: http://connect.linaro.org.s3.amazonaws.com/hkg18/presentations/hkg18-tr14.pdf
Video: http://connect.linaro.org.s3.amazonaws.com/hkg18/videos/hkg18-tr14.mp4
---------------------------------------------------
★ Event Details ★
Linaro Connect Hong Kong 2018 (HKG18)
19-23 March 2018
Regal Airport Hotel Hong Kong
---------------------------------------------------
Keyword: Training
'http://www.linaro.org'
'http://connect.linaro.org'
---------------------------------------------------
Follow us on Social Media
https://www.facebook.com/LinaroOrg
https://www.youtube.com/user/linaroorg?sub_confirmation=1
https://www.linkedin.com/company/1026961
Přednáška zaměřená na rychlý přehled nových technologií v operačním systému Windows 10 a nových mikroarchitekturách procesorů Intel (Haswell, Sky Lake a Kaby Lake). Detailněji se pak bude věnovat některým klíčovým novinkám jako je virtual based security ve Windows 10, nebo některým bezpečnostním rozšířením procesorů. Závěrem poskytne přehled zdrojů k detailním informacím a příkladům využití. Přednáška bude koncipována jako "svodka technologických novinek". Autor bude přítomný po celou dobu konání konference a rád odpoví na Vaše otázky.
This presentation is about U-Boot: the most popular open source, primary boot loader used in embedded devices, as well as it's mechanisms and features.
The respective talk was held by Sam Protsenko (Software Engineer, Consultant, GlobalLogic) at GlobalLogic Mykolaiv Embedded TechTalk #1 on May 25, 2018.
Linux Kernel Platform Development: Challenges and InsightsGlobalLogic Ukraine
This presentation is about the main tasks which Linux kernel platform engineers take care of. The talk includes real-life cases which help understand the role of respective specialists and might be helpful to those who consider such change in their careers.
The talk was delivered by Sam Protsenko (Software Engineer, Consultant, GlobalLogic) at GlobalLogic Embedded Career Day #2 on February 10, 2018.
More about GlobalLogic Embedded Career Day #2: https://www.globallogic.com/ua/events/globallogic-kyiv-embedded-career-day-2-materials
HKG15-409: ARM Hibernation enablement on SoCs - a case studyLinaro
HKG15-409: ARM Hibernation enablement on SoCs - a case study
---------------------------------------------------
Speaker: Grygorii Strashko
Date: February 12, 2015
---------------------------------------------------
★ Session Summary ★
Hibernation on ARM devices is a long-wanted feature, with multiple ways of achieving it - in-kernel, fully userspace, or a combination. This presentation will give brief overview of these methods, and will discuss the effort required in enabling in-kernel ARM hibernation to the TI platform. We will also share the pre-requisites for enabling this on other SoCs.
--------------------------------------------------
★ Resources ★
Pathable: https://hkg15.pathable.com/meetings/250837
Video: https://www.youtube.com/watch?v=dJqCbTfKrMk
Etherpad: http://pad.linaro.org/p/hkg15-409
---------------------------------------------------
★ Event Details ★
Linaro Connect Hong Kong 2015 - #HKG15
February 9-13th, 2015
Regal Airport Hotel Hong Kong Airport
---------------------------------------------------
http://www.linaro.org
http://connect.linaro.org
Let's trace Linux Lernel with KGDB @ COSCUP 2021Jian-Hong Pan
https://coscup.org/2021/en/session/39M73K
https://www.youtube.com/watch?v=L_Gyvdl_d_k
Engineers have plenty of debug tools for user space programs development, code tracing, debugging and analyzing. Except “printk”, do we have any other debug tools for Linux kernel development? The “KGDB” mentioned in Linux kernel document provides another possibility.
Will share how to experiment with the KGDB in a virtual machine. And, use GDB + OpenOCD + JTAG + Raspberry Pi in the real environment as the demo in this talk.
開發 user space 軟體時,工程師們有方便的 debug 工具進行查找、分析、除錯。但在 Linux kernel 的開發,除了 printk 外,還可以有哪些工具可以使用呢?從 Linux kernel document 可以看到 KGDB 相關的資訊,提供了在 kernel 除錯時的另一個可能性。
本次將分享,從建立最簡單環境的虛擬機機開始,到實際使用 GDB + OpenOCD + JTAG + Raspberry Pi 當作展示範例。
Bringing up Android on your favorite X86 Workstation or VM (AnDevCon Boston, ...Ron Munitz
My session at AnDevCon Bostong, May 2013, Boston, MA.
This class introduces the concepts of AOSP and how to use it in order to configure and build one of the most popular Android devices available: The Android emulator, for an x86 target. You will then learn a reincarnation of the AOSP, intended to bring Android to as many x86 devices as possible. You will see its structure and compare it with the AOSP, and demonstrate how such a build works within Virtual Box, QEMU and more.
LEVEL: Intermediate
TOPIC AREA: Embedded Android
For Training/Consulting requests: info@thepscg.com
Kernel Recipes 2015 - Kernel dump analysisAnne Nicolas
Kernel dump analysis
Cloud this, cloud that…It’s making everything easier, especially for web hosted services. But what about the servers that are not supposed to crash ? For applications making the assumption the OS won’t do any fault or go down, what can you write in your post-mortem once the server froze and has been restarted ? How to track down the bug that lead to service unavailability ?
In this talk, we’ll see how to setup kdump and how to panic a server to generate a coredump. Once you have the vmcore file, how to track the issue with “crash” tool to find why your OS went down. Last but not least : with “crash” you can also modify your live kernel, the same way you would do with gdb.
Adrien Mahieux – System administrator obsessed with performance and uptime, tracking down microseconds from hardware to software since 2011. The application must be seen as a whole to provide efficiently the requested service. This includes searching for bottlenecks and tradeoffs, design issues or hardware optimization.
De gemiddelde GPU bevat tegenwoordig meer PK's dan de CPU. Naar aanleiding hiervan komen er steeds meer mogelijkheden om computationele problemen te verplaatsen van de CPU naar de GPU. Deze presentatie zal een inleiding zijn hoe je dit in Java kunt doen met behulp van Jogamp JoCL. Aan de hand van enkele simpele problemen wordt aangetoond wanneer een GPU beter ingezet kan worden dan een CPU en vice versa. Dit is ook een van de speerpunten in Java 9 (Project Sumatra) wat o.a. JoCL als inspiratie gebruikt.
Top Features to Include in Your Winzo Clone App for Business Growth (4).pptxrickgrimesss22
Discover the essential features to incorporate in your Winzo clone app to boost business growth, enhance user engagement, and drive revenue. Learn how to create a compelling gaming experience that stands out in the competitive market.
Graspan: A Big Data System for Big Code AnalysisAftab Hussain
We built a disk-based parallel graph system, Graspan, that uses a novel edge-pair centric computation model to compute dynamic transitive closures on very large program graphs.
We implement context-sensitive pointer/alias and dataflow analyses on Graspan. An evaluation of these analyses on large codebases such as Linux shows that their Graspan implementations scale to millions of lines of code and are much simpler than their original implementations.
These analyses were used to augment the existing checkers; these augmented checkers found 132 new NULL pointer bugs and 1308 unnecessary NULL tests in Linux 4.4.0-rc5, PostgreSQL 8.3.9, and Apache httpd 2.2.18.
- Accepted in ASPLOS ‘17, Xi’an, China.
- Featured in the tutorial, Systemized Program Analyses: A Big Data Perspective on Static Analysis Scalability, ASPLOS ‘17.
- Invited for presentation at SoCal PLS ‘16.
- Invited for poster presentation at PLDI SRC ‘16.
AI Genie Review: World’s First Open AI WordPress Website CreatorGoogle
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✅Publish Automated Posts and Pages using AI Genie directly on Your website
✅50 DFY Websites Included Without Adding Any Images, Content Or Doing Anything Yourself
✅Integrated Chat GPT Bot gives Instant Answers on Your Website to Visitors
✅Just Enter the title, and your Content for Pages and Posts will be ready on your website
✅Automatically insert visually appealing images into posts based on keywords and titles.
✅Choose the temperature of the content and control its randomness.
✅Control the length of the content to be generated.
✅Never Worry About Paying Huge Money Monthly To Top Content Creation Platforms
✅100% Easy-to-Use, Newbie-Friendly Technology
✅30-Days Money-Back Guarantee
See My Other Reviews Article:
(1) TubeTrivia AI Review: https://sumonreview.com/tubetrivia-ai-review
(2) SocioWave Review: https://sumonreview.com/sociowave-review
(3) AI Partner & Profit Review: https://sumonreview.com/ai-partner-profit-review
(4) AI Ebook Suite Review: https://sumonreview.com/ai-ebook-suite-review
#AIGenieApp #AIGenieBonus #AIGenieBonuses #AIGenieDemo #AIGenieDownload #AIGenieLegit #AIGenieLiveDemo #AIGenieOTO #AIGeniePreview #AIGenieReview #AIGenieReviewandBonus #AIGenieScamorLegit #AIGenieSoftware #AIGenieUpgrades #AIGenieUpsells #HowDoesAlGenie #HowtoBuyAIGenie #HowtoMakeMoneywithAIGenie #MakeMoneyOnline #MakeMoneywithAIGenie
Need for Speed: Removing speed bumps from your Symfony projects ⚡️Łukasz Chruściel
No one wants their application to drag like a car stuck in the slow lane! Yet it’s all too common to encounter bumpy, pothole-filled solutions that slow the speed of any application. Symfony apps are not an exception.
In this talk, I will take you for a spin around the performance racetrack. We’ll explore common pitfalls - those hidden potholes on your application that can cause unexpected slowdowns. Learn how to spot these performance bumps early, and more importantly, how to navigate around them to keep your application running at top speed.
We will focus in particular on tuning your engine at the application level, making the right adjustments to ensure that your system responds like a well-oiled, high-performance race car.
E-commerce Application Development Company.pdfHornet Dynamics
Your business can reach new heights with our assistance as we design solutions that are specifically appropriate for your goals and vision. Our eCommerce application solutions can digitally coordinate all retail operations processes to meet the demands of the marketplace while maintaining business continuity.
Artificia Intellicence and XPath Extension FunctionsOctavian Nadolu
The purpose of this presentation is to provide an overview of how you can use AI from XSLT, XQuery, Schematron, or XML Refactoring operations, the potential benefits of using AI, and some of the challenges we face.
Custom Healthcare Software for Managing Chronic Conditions and Remote Patient...Mind IT Systems
Healthcare providers often struggle with the complexities of chronic conditions and remote patient monitoring, as each patient requires personalized care and ongoing monitoring. Off-the-shelf solutions may not meet these diverse needs, leading to inefficiencies and gaps in care. It’s here, custom healthcare software offers a tailored solution, ensuring improved care and effectiveness.
Launch Your Streaming Platforms in MinutesRoshan Dwivedi
The claim of launching a streaming platform in minutes might be a bit of an exaggeration, but there are services that can significantly streamline the process. Here's a breakdown:
Pros of Speedy Streaming Platform Launch Services:
No coding required: These services often use drag-and-drop interfaces or pre-built templates, eliminating the need for programming knowledge.
Faster setup: Compared to building from scratch, these platforms can get you up and running much quicker.
All-in-one solutions: Many services offer features like content management systems (CMS), video players, and monetization tools, reducing the need for multiple integrations.
Things to Consider:
Limited customization: These platforms may offer less flexibility in design and functionality compared to custom-built solutions.
Scalability: As your audience grows, you might need to upgrade to a more robust platform or encounter limitations with the "quick launch" option.
Features: Carefully evaluate which features are included and if they meet your specific needs (e.g., live streaming, subscription options).
Examples of Services for Launching Streaming Platforms:
Muvi [muvi com]
Uscreen [usencreen tv]
Alternatives to Consider:
Existing Streaming platforms: Platforms like YouTube or Twitch might be suitable for basic streaming needs, though monetization options might be limited.
Custom Development: While more time-consuming, custom development offers the most control and flexibility for your platform.
Overall, launching a streaming platform in minutes might not be entirely realistic, but these services can significantly speed up the process compared to building from scratch. Carefully consider your needs and budget when choosing the best option for you.
Zoom is a comprehensive platform designed to connect individuals and teams efficiently. With its user-friendly interface and powerful features, Zoom has become a go-to solution for virtual communication and collaboration. It offers a range of tools, including virtual meetings, team chat, VoIP phone systems, online whiteboards, and AI companions, to streamline workflows and enhance productivity.
Do you want Software for your Business? Visit Deuglo
Deuglo has top Software Developers in India. They are experts in software development and help design and create custom Software solutions.
Deuglo follows seven steps methods for delivering their services to their customers. They called it the Software development life cycle process (SDLC).
Requirement — Collecting the Requirements is the first Phase in the SSLC process.
Feasibility Study — after completing the requirement process they move to the design phase.
Design — in this phase, they start designing the software.
Coding — when designing is completed, the developers start coding for the software.
Testing — in this phase when the coding of the software is done the testing team will start testing.
Installation — after completion of testing, the application opens to the live server and launches!
Maintenance — after completing the software development, customers start using the software.
Mobile App Development Company In Noida | Drona InfotechDrona Infotech
Looking for a reliable mobile app development company in Noida? Look no further than Drona Infotech. We specialize in creating customized apps for your business needs.
Visit Us For : https://www.dronainfotech.com/mobile-application-development/
OpenMetadata Community Meeting - 5th June 2024OpenMetadata
The OpenMetadata Community Meeting was held on June 5th, 2024. In this meeting, we discussed about the data quality capabilities that are integrated with the Incident Manager, providing a complete solution to handle your data observability needs. Watch the end-to-end demo of the data quality features.
* How to run your own data quality framework
* What is the performance impact of running data quality frameworks
* How to run the test cases in your own ETL pipelines
* How the Incident Manager is integrated
* Get notified with alerts when test cases fail
Watch the meeting recording here - https://www.youtube.com/watch?v=UbNOje0kf6E
Introducing Crescat - Event Management Software for Venues, Festivals and Eve...Crescat
Crescat is industry-trusted event management software, built by event professionals for event professionals. Founded in 2017, we have three key products tailored for the live event industry.
Crescat Event for concert promoters and event agencies. Crescat Venue for music venues, conference centers, wedding venues, concert halls and more. And Crescat Festival for festivals, conferences and complex events.
With a wide range of popular features such as event scheduling, shift management, volunteer and crew coordination, artist booking and much more, Crescat is designed for customisation and ease-of-use.
Over 125,000 events have been planned in Crescat and with hundreds of customers of all shapes and sizes, from boutique event agencies through to international concert promoters, Crescat is rigged for success. What's more, we highly value feedback from our users and we are constantly improving our software with updates, new features and improvements.
If you plan events, run a venue or produce festivals and you're looking for ways to make your life easier, then we have a solution for you. Try our software for free or schedule a no-obligation demo with one of our product specialists today at crescat.io
Navigating the Metaverse: A Journey into Virtual Evolution"Donna Lenk
Join us for an exploration of the Metaverse's evolution, where innovation meets imagination. Discover new dimensions of virtual events, engage with thought-provoking discussions, and witness the transformative power of digital realms."
Code reviews are vital for ensuring good code quality. They serve as one of our last lines of defense against bugs and subpar code reaching production.
Yet, they often turn into annoying tasks riddled with frustration, hostility, unclear feedback and lack of standards. How can we improve this crucial process?
In this session we will cover:
- The Art of Effective Code Reviews
- Streamlining the Review Process
- Elevating Reviews with Automated Tools
By the end of this presentation, you'll have the knowledge on how to organize and improve your code review proces
Transform Your Communication with Cloud-Based IVR SolutionsTheSMSPoint
Discover the power of Cloud-Based IVR Solutions to streamline communication processes. Embrace scalability and cost-efficiency while enhancing customer experiences with features like automated call routing and voice recognition. Accessible from anywhere, these solutions integrate seamlessly with existing systems, providing real-time analytics for continuous improvement. Revolutionize your communication strategy today with Cloud-Based IVR Solutions. Learn more at: https://thesmspoint.com/channel/cloud-telephony
Software Engineering, Software Consulting, Tech Lead, Spring Boot, Spring Cloud, Spring Core, Spring JDBC, Spring Transaction, Spring MVC, OpenShift Cloud Platform, Kafka, REST, SOAP, LLD & HLD.
6. 6
System Boot
Boot mode
• NOR Flash
• NAND Flash
• SD/MMC/eMMC
• USB
• UART (“BOOTME”!)
• SPI/I2C (NOR, EEPROM)
• …
7. 7
System Boot
Typical booting sequence
OnChip ROM
Boot source
1
OnChip RAM
(SPL, IBL, etc.)
2 3
RAM,
Bootloader
OS
4
1. OnChip ROM detects boot source
2. OnChip ROM reads intermediate bootloader into OnChip RAM and transfers
control to it
Or
OnChip ROM reads configuration into OnChip RAM, initializes RAM, loads and
runs main bootloader
3. SPL initializes RAM, loads and runs main bootloader
4. Main bootloader loads OS
2
8. 8
Intermediate bootloader
SPL – Secondary Program Loader
Common name
Other names (Vendor specific):
IBL (Intermediate Boot Loader)
UBL (User Boot Loader)
X-loader (External Loader)
…
Features:
• Open source (Vendor provided)
• Executing in OnChip RAM
• Small size (OnChip RAM)
Main functions:
• Memory Controller and RAM initialization
• Loads main bootloader
16. 16
OS: porting Linux
No kernel messages
Kernel booting issues
• Check UART settings and configuration
platform (2.6) / DTS (3.0, …)
• Enable early debug:
arch/arm/boot/compressed/head.S
arch/arm/mach-<soc>/include/mach/
debug-macro.S (2.6)
or
arch/arm/boot/compressed/debug.S (3.0, …)
Макросы:
addruart
senduart
busyuart
waituart
17. 17
OS: porting Linux
Kernel is booted!
• Load simple target image
• Create custom platform
(finalizing changes)
• Build and load new target images
(X-Window, Gnome, …)
Kernel successfully booted
18. 18
Linux: kernel backporting
Reasons ?
• Customer requirements (particular version is needed)
• Support (driver updates)
• Security (fix vulnerabilities)
• ???
19. 19
Linux: kernel backporting
From 3.0.35 to 2.6.34
Requirements
Kernel 2.6.34
Vendor BSP
Kernel 3.0.35
i.MX 6Dual based board
arch/arm, include, drivers, kernel, init, mm
Patch 40M
include
kernel,
mm,
init
drivers
dma, ata,
i2c,mmc, usb,
media, net,
power,
regulator, rtc,
spi, video, serial,
watchdog,
Kconfigs,
Makefiles
arch/arm
mach-, plat-,
mm, kernel,
common,
include,
Kconfigs,
Makefiles
20. 20
OS: Linux instead of Android ?
The task
IN OUT
???
Would it be possible to install Linux instead of stock Android ?
• Linux (any distro)
• GUI (X11)
Requirements:
Specific software
22. 22
OS: Linux instead of Android ?
Results
Boot splash Login
GPE
Features
• Angstrom distro
• x11-gpe-image
• No multitouch is supported (modified TS-driver)
• Rootfs on USB drive (root=/dev/sda1)
24. 24
Hardware issues
Common approach:
troubleshooting and looking for solution
Start
Localization
Test
Can it
be
solved
by SW ?
Is it
HW-
issue ?
Yes
Solution
Yes
Debug
No
End
No
1
2
3
4
6
7
5
8
1. Suspected HW-issue
2. Localization failing source code.
3. HW test
(“three-lines program”).
4. HW issue confirmed ?
5. No.
Caused by SW.
6. Yes.
Can be bypassed by SW ?
7. Yes.
Working out solution and add it to sources
8. Further accordingly to results
(Fail or Success).Fail
Success
25. 25
Hardware issues
Software solution
A workaround is a bypass of a recognized problem in a system.
A workaround is typically a temporary fix that implies that a genuine solution to the problem is needed.
But workarounds are frequently as creative as true solutions, involving outside the box thinking in their creation.
Workaround
From Wikipedia, the free encyclopedia
Solution for
HW-issue ?
The problem is already
known and there is a
solution
(Errata documents, etc.)
Device specific
Workaround Reimplementation ?
26. 26
Software solution: workaround
Spontaneous device power on
Caused by ? PowerOn bounce
Is
PowerOn
pressed
≥ 5 sec ?
Yes
No
PowerOff
Boot device
The solution
was implemented
in bootloader
(U-Boot)
27. 27
Software solution: workaround
Unstable device behavior
Caused by ? SDCLK rate
Routing error: the device was
not able to stable work with
needed SDCLK rate.
Adjust CLK
divisors
and gating
The solution
was implemented
in bootloaders
(SPL, proprietary)
28. 28
Software solution: workaround
CMOS camera1: black and white photos
Preview
Still
Caused by ? MasterClock (MCLK) rate
Adjust CLK divisors
and gating
(decrease clock rate)
The solution
was implemented
in driver.
Design error: the device cannot
provide camera with needed MCLK
rate (it is impossible to find correct
divisors values).
Fixed by frequency rate decreasing
that in turn caused FrameRate
decreasing in Preview mode.
(~10 fps).
29. 29
Software solution: workaround
CMOS Camera2: autofocus frame is present on the photos
Preview
Still
Caused by ? Sensor firmware error
Autofocus frame is occasionally
emerged on the photos despite
of explicitly executed command
“Hide frame” in accordance with
Application Notes.
Fixed by setting
autofocus frame
Hsize and Vsize to 0
via found
undocummented
registers
The solution
was implemented
in driver
The solution (needed registers)
was found through reverse-
engineering of Sensor Devkit
SWtools.
30. 30
Software solution: workaround
LCD: the leftmost column issue
Display
Actual Anticipated
Caused by ? HSyncStart, HSyncWidth, HTotal ?
The needed values of horizontal
synchronization parameters to
correctly display leftmost column
weren’t eventually found.
Presumable root cause is
incompatibility of particular
TFT LCD and videocontroller.
Fixed by filling
framebuffer data in
accordance with
actual image size
The solution
implemented
in driver
31. 31
Software solution: workaround
Resistive touchscreen: false pressings
Caused by ? Touchscreen feature ?
Completed
collecting
samples
No
Get
sample
Is
sample
valid ?
Is
PenDown
?
Yes
Collect
sampleYes
No
The solution
was implemented
in driver
False pressings were
successfully filtered out via
checking of distance between
points.
Presumable root cause of
such behavior is a feature of
particular touchscreen
connected as follows:
TS
Codec
AC97
SOC
32. 32
Software solution: reimplementation
ASIC video controller:
incorrectly working hardware BitBlt with OR
OR =
Caused by ? ASIC VC error
XOR =
The solution
was implemented
in driver
Symbols displaying was
implemented with hardware
BitBlt with XOR.
33. 33
Software solution: reimplementation
RTC Alarm reboot
Watchdog
timer
Reboot
OnChip RTC
Caused by ? No external RTC
PeriodicInterruptInterval = 3 ms
Enable PeriodicInterrupt counting
Enter DeepSleep Mode
WakeUp!
Boot
Device rebooting was performed
through transition to Deep Sleep
mode and subsequent waking up on
RTC Periodic Interrupt Alarm event.
Such a mechanism let to avoid onchip
RTC reset that took place in case of
Watchdog Reset.
3 ms
34. 34
Software solution: not found
FPGA FPGA
CPU CPU
Board1 Board2
RAM RAM
DMA DMAHigh Speed
interface
I/O I/O
About design errors
“Bottle neck”
Due to erroneous design actual traffic rate turned out to
be half the level of anticipated.
The bottle neck was FPGA <-> FPGA section.
This issue doesn’t have a software solution.
35. 35
Hardware issue ?
SD HC vs SD Host 1.01
SD Spec. 2.0
SD Host controller,
SD Spec. 1.01
?
It works!
CMD8,
Set Response Format
as R1/R6
This is not hardware issue!
In accordance with SD Spec. 2.0 SDHC cards shall execute CMD8 (Send
Interface Condition) after CMD0 (Go Idle State) and before ACMD41 (Send
Operation Condition) during card initialization.
Minor driver fix allowed to work with SDHC card on SD Spec. 1.01 host
controller.
36. 36
Contacts
Thank You
Auriga, USA
92 Potter Rd, Ste. 1
Wilton, NH 03086, USA
Phone: +1 (866) 645-1119
Fax: +1 (603) 386-6097
info@auriga.com
www.auriga.com
Auriga, Russia
125 Varshavskoe Shosse, Unit 16A,
Moscow, 117587
Tel:+7 (495) 713-9900
Fax:+7 (495) 939-0300
info@auriga.com
www.auriga.com