Open Source Summit North America 2022

In a post pandemic world, enabling efficient remote work has become a strong requirement. Firmware engineering workflows are difficult in a fully virtual environment. OSFCI aims to address this need by offering an edge working environment to firmware engineers with default support for open communities like OpenBMC, LinuxBoot etc. We built one of the world’s first fully open-source continuous integration platform for open-source firmware. The evolution is from some early iterations circa 2018 - coverage at that time was for LinuxBoot on very limited hardware. We now offer a web-service with a fully featured API. At a high level, we have: - a microservices based architecture implemented in Golang designed for scale - multi-node deployment that includes API / web gateway, controllers, compilers etc. - full execution on real hardware with rapid firmware swap-testing workflow - support for cutting edge industry test-frameworks - a free public instance based on cutting edge server platforms available to all This project is now part of Open Compute Platform (OCP). We welcome new users and contributors to the effort. We have easy playbooks for development and deployment.

SoC should be maintained in optimal temperature to prevent permanent damaging and to gain best performance. Thermal Management Unit (TMU), monitors variation in chip by monitoring on chip temperature. It generates interrupt to CPU when temperature crosses pre-defined threshold levels and initiates to perform cooling actions such as switch on the fan or CPU throttling or thermal tripping. SoC can have single or multiple temperature sensors placed in it. In case of multiple sensors, there will be one main sensor (with digitizer) and multiple remote sensors which can be placed in different blocks of the SoC. Remote sensors will be sensed and controlled by digitizer of main sensor. Linux have framework to make this temperature reading available to user space. Company specific temperature sensor drivers can be mapped and make use of platform independent thermal framework which is already available in Linux. Conventional thermal framework supports to read temperature only from single sensor. In this session we will walk through on basic of thermal management, supporting thermal framework feature which are already available in Linux. We will look upon how we have also improvised this framework to read temperature from main and multiple remote sensors.

This talk is partitioned into 4 sections. It starts with a comprehensive Wi-Fi 6 introduction. Also known as high-efficiency Wi-Fi, for the overall improvements targetting dense environments, the former IEEE 802.11ax standard has been ratified early last year. The first part introduces its main concepts which amongst others go by abbreviations like OFDMA, 1024-QAM, 160 MHz channels, MU-MIMO, TWT, and WPA3. Wi-Fi 6E enabling operation of features in the unlicensed 6 GHz band is also covered. The second part looks at the Wi-Fi 6 OpenWrt AP/router landscape. The only officially supported devices are all based on the MediaTek MT7915E chipset while supporting promising Qualcomm IPQ807x resp. Qualcomm QCN5054/QCN9024 based devices is still a work in progress. Wi-Fi 6 clients are covered in the third part with the pre-dominant Intel AX200/201/210 cards, MediaTek MT7921K Wi-Fi 6E, and Qualcomm QCA6391 based clients all running mainline Linux, of course. The last part concludes with a discussion of various real-life configurations and benchmark demo use cases.