ELC North America 2017- Mainline Linux on Amlogic SoCs

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Inexpensive set-top boxes are everywhere and many of them are powered by AmLogic SoCs. These chips provide 4K H.265/VP9 video decoding and have fully open source Linux kernel and U-boot releases. Unfortunately most of the products based on these devices are running an ancient 3.10 Android kernel. Thankfully AmLogic has put a priority on supporting their chips in the mainline Linux kernel. Neil will present the challenges and benefits to pushing support for these SoCs upstream, as well as the overall hardware architecture in order to understand the Linux upstreaming decisions and constraints. Neil will also detail the future development plans aiming to offer a complete experience running an Upstream Linux kernel.

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Android TV is a relatively recent Google Initiative to use the Android Operating System for TV Set-top-boxes, reusing the Phone Operating System architecture. In the last years, the Android Hardware Abstraction Libraries were adapted/rewritten to use the modern and recent Linux APIs like DRM/KMS, V4L2 for Video Decode, ... allowing Android to boot and work with mainline Linux. During last year, Neil was involved into an upstream-first open Android TV BSP, aiming to fully support AOSP for TV running on a Low-Cost generally available ARM based System-on-Chip designed for TV application. Neil will overview the requirements and struggles in term of system support, upstreaming & Android tweaking to enable AOSP to boot on such device, including the whole trusted boot chain, to graphical Linux with multimedia features enabled.

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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.

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In the last 10 years, the GPIO and PINCTRL subsystem matured to support almost every possible handling of Programmable Input/Outputs and more generally multiplexing of multiple functions on single "Pins" or group of "Pins". However, what is a "Pin"? What is a multiplexed "Function"? How programmable I/Os and pin functions are designed on the majority of System-On-Chips? Neil will describe this from the Hardware design Point-Of-View, the constraints and the requirements. Then Neil will explain how this particular subject was handled over the years in the Linux kernel, to finally get to the current GPIO & PINCTRL subsystems, and how it articulates with the Device Tree and other Firmware based protocols.

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Porting and maintaining Linux for a Multimedia SoC is one thing (already very complex), but without a proper Bootloader, how would we do ? For the last 4 Years, we were pushing Upstream Linux support for the Amlogic Multimedia SoCs with very well-known Single Board Computers like Odroid-C2, Libre Computer Le Potato, Khadas VIMs... but a key point was missing until 2 years ago: a clean Bootloader. We only relied on the Vendor Bootloader, but it quickly became an issue for various reasons: - was complex to rebuild - even more complex to enhance and fix - did some weird and quirkly hardware enablement before linux - was confusing because the vendor Bootloader behavior changed over time So we implemented an all-most complete U-Boot support for these Amlogic SoCs, including HDMI video support and support Android AOSP boot. And a big bonus appeared: we got UEFI support for free ! Neil will go through all the development process, what we achieved, the remaining work and how U-Boot maintenance and code quality evolved over time.

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Since the switch of the ARM Linux support from the stable PowerPC Device Tree support, it became an important piece of software used to describe all sorts of devices based on very different hardware architectures. Currently, BSD* Unixes and even the Zephyr RTOS has switched to Device Tree to describe the hardware. U-boot has also a file format using the Device Tree blob format. Neil will present you the history of Device Tree from its origins, how it has been used for ARM and now RISC-V from the PowerPC codebase, all the very different current usage and an overview of its future application and evolutions.

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You maintain or used to maintain a Linux based board or SoC off-tree ? Then there are plenty of reasons for you to push your changes to the mainline Linux. Some will say itâ€™s too late, or too complex, or too expensive but the long-term benefits of regular upstreaming truly outpass these constraints especially it you have the right methods. In this presentation Neil will elaborate on this question. Neil will then expose the various challenges about code upstreaming, like time constraints, copyright issues and the community aspect of the work. For example, vendor GPL code is generally lying on an obscure github repo, or in a hardly reachable tarball. In parallel, Neil will present practical tips to easier your day to day upstream work and explicit this simple rule : the fastest the maximum patches are upstreamed, the less work youâ€™ll have to actually maintain the port in the future.

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