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Self-hosted OpenGL ES Development on Ubuntu Touch

January 15th, 2017 4 comments

Blu wrote BQ Aquaris M10 Ubuntu Edition review – from a developer’s perspective – last year, and now is back with a new post explaining how to develop and deploy OpenGL ES applications directly on the Ubuntu Touch tablet.

Ever since I started using a BQ M10 for console apps development on the go I’ve been wanting to get something, well, flashier going on that tablet. Since I’m a graphics developer by trade and by heart, GLES was the next step on the Ubuntu Touch for me. This article is about writing, building and deploying GLES code on Ubuntu Touch itself, sans a desktop PC. Keep that in mind if some procedure seems unrefined or straight primitive to you – for one, I’m a primitive person, but some tools available on the desktop are, in my opinion, impractical on the Touch itself. That means no QtCreator today, nor Qt, for that matter.

The display of any contemporary Ubuntu Touch device is powered by Mir – a modern compositor/surface manager taking care of all (rectangular-ish) things eventually appearing on screen. We won’t be delving much into Mir beyond obtaining an EGL context (EGL being the binding layer between GLES and the native windowing system). But enough ado – let’s get to work.

Preparations for doing GLES on a Ubuntu Touch box:

The above, as of the time of this writing, should provide you with gcc/g++-4.9, make and gdb-7.9, among other things. The last package and its dependencies provide you with up-to-date Mir headers. Git comes out of the box, IIRC, but if it’s missing just apt-get it.

We need a primer to step on, so here’s my adaptation of Don Bright’s Mir/GLES adaptation of Joe Groff’s OpenGL tutorials, using Daniel van Vugt’s Mir/EGL examples (yes, that’s a quite a chain-work):

I’ve taken the liberty to expand on the work of those gentlemen by bringing the Mir integration up to date, handling Touch’s novelty Desktop Mode and throwing in my own dusty GLES sample code, for good measure.

To build and install the primer, just do:

That will provide you with an original police-car flashing-lights primer. An alternative primer featuring tangential-space bump-mapping can be built by passing arg ‘guest’ to the build script:

Both versions of the primer use a fundamentally identical interface — a resource-initialization procedure and a frame-drawing procedure, so it’s not much of an effort to use the respective routines from either primers in the framework of the host app hello.cpp, and thus get a running render loop.

A few words about the peculiarities of the GLES development for Ubuntu Touch. It took me some time to show anything on screen, despite the fact I had a valid draw context and a render loop soon after the primer was building successfully. The reason is Unity8 on the Touch will not simply let you run a window-painting app from the terminal – you would get your Mir and EGL contexts alright, but the target surface will never be composited to the screen of the device upon eglSwapBuffers() unless you take certain actions. You have two alternatives here:

  • Produce a valid Click package from your app and subsequently install that to the Apps pane (what our build script does), where you can launch from an icon, or…
  • Use a launcher app to start your window app (info courtesy of Daniel van Vugt):

Unfortunately the second (much quicker and convenient) approach is not currently usable due to a bug, so we’ll stick with the first. Any command-line args we’d want to pass to the app will need to be written to the app’s .desktop file, which can be found at the official app location after installation:

In that file, set the desired args on the ‘Exec’ line, like this:

Another peculiarity was that in Desktop Mode the app window does a classical ‘zoom to full size’ animation at start. Nothing extraordinary in that, if not for the fact that the Mir surface itself resizes along with the window. Now, a default viewport in a GLES context spans the geometry of the target surface at the time of its creation, which, in our case, is the start of the window-zoom animation, with its tiny surface geometry. One needs to wait for the zoom animation to finish, and then set the viewport geometry to the final geometry of the Mir surface, or live with a post-stamp-sized output in the lower left corner of the window, if the viewport is left unchanged.

Once we get past those teething hurdles we actually get quite a nicely behaving full-screen app on our hands – it composites smoothly with all other Ubuntu Touch desktop elements like the Launcher tab at the desktop’s left edge and the pull-down Indicator pane on right (see screenshot). Our app even does live output to the Scopes selector screen (i.e. the task-switching screen) — behold the miracles of modern-day screen compositors! ; )

Click for Original Size (1920×1080)

But hey, don’t just take my word for it – try out GLES coding on a Ubuntu Touch device – you have the basics covered:

  • App’s rendering loop and the entirety of the flashing-screen primer are in hello.cpp
  • Mir context creation and subsequent EGL context binding are in eglapp.cpp
  • Bump-mapping primer is entirely in app_sphere.cpp
  • Various helpers are spread across util_* TUs and hello.cpp
  • All files necessary for the generation of the Click package are in resource folder.

In conclusion, self-sustained development on the Ubuntu Touch is a perfectly viable scenario (take that, iOS!). Moreover, the GPU in the BQ M10 turned out to have a very nice modern GLES3 (3.1) stack – see excerpts from the app logs below. Actually, this is my first portable device with a GLES 3.1 stack, so I haven’t started using it properly yet — the GLES2 primer above doesn’t make use of the new functionality.

If I have to complain about something from the development of this primer, it’d be that I couldn’t use my arm64 code on the primer, since there are only armhf (32-bit) EGL/GLES libraries available for the Touch. So 64-bit code on the Ubuntu Touch remains in console land for now.

Excerpts from the primer logs:

egl version, vendor, extensions:

1.4 Android META-EGL
Android
EGL_KHR_get_all_proc_addresses EGL_ANDROID_presentation_time EGL_KHR_image EGL_KHR_image_base EGL_KHR_gl_texture_2D_image EGL_KHR_gl_texture_cubemap_image EGL_KHR_gl_renderbuffer_image EGL_KHR_fence_sync EGL_KHR_create_context EGL_ANDROID_image_native_buffer EGL_KHR_wait_sync EGL_ANDROID_recordable EGL_HYBRIS_native_buffer2 EGL_HYBRIS_WL_acquire_native_buffer EGL_WL_bind_wayland_display

gl version, vendor, renderer, glsl version, extensions:

OpenGL ES 2.0 (OpenGL ES 3.1)
ARM
Mali-T720
OpenGL ES GLSL ES 3.10
GL_EXT_debug_marker GL_ARM_rgba8 GL_ARM_mali_shader_binary GL_OES_depth24 GL_OES_depth_texture GL_OES_depth_texture_cube_map GL_OES_packed_depth_stencil GL_OES_rgb8_rgba8 GL_EXT_read_format_bgra GL_OES_compressed_paletted_texture GL_OES_compressed_ETC1_RGB8_texture GL_OES_standard_derivatives GL_OES_EGL_image GL_OES_EGL_image_external GL_OES_EGL_sync GL_OES_texture_npot GL_OES_vertex_half_float GL_OES_required_internalformat GL_OES_vertex_array_object GL_OES_mapbuffer GL_EXT_texture_format_BGRA8888 GL_EXT_texture_rg GL_EXT_texture_type_2_10_10_10_REV GL_OES_fbo_render_mipmap GL_OES_element_index_uint GL_EXT_shadow_samplers GL_OES_texture_compression_astc GL_KHR_texture_compression_astc_ldr GL_KHR_texture_compression_astc_hdr GL_KHR_debug GL_EXT_occlusion_query_boolean GL_EXT_disjoint_timer_query GL_EXT_blend_minmax GL_EXT_discard_framebuffer GL_OES_get_program_binary GL_OES_texture_3D GL_EXT_texture_storage GL_EXT_multisampled_render_to_texture GL_OES_surfaceless_context GL_OES_texture_stencil8 GL_EXT_shader_pixel_local_storage GL_ARM_shader_framebuffer_fetch GL_ARM_shader_framebuffer_fetch_depth_stencil GL_ARM_mali_program_binary GL_EXT_sRGB GL_EXT_sRGB_write_control GL_EXT_texture_sRGB_decode GL_KHR_blend_equation_advanced GL_OES_texture_storage_multisample_2d_array GL_OES_shader_image_atomic

GL_MAX_TEXTURE_SIZE: 8192
GL_MAX_CUBE_MAP_TEXTURE_SIZE: 4096
GL_MAX_VIEWPORT_DIMS: 8192, 8192
GL_MAX_RENDERBUFFER_SIZE: 8192
GL_MAX_VERTEX_ATTRIBS: 16
GL_MAX_VERTEX_UNIFORM_VECTORS: 1024
GL_MAX_VARYING_VECTORS: 15
GL_MAX_FRAGMENT_UNIFORM_VECTORS: 1024
GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS: 48
GL_MAX_VERTEX_TEXTURE_IMAGE_UNITS: 16
GL_MAX_TEXTURE_IMAGE_UNITS: 16

Imagination PowerVR G6230 is the First GPU To Pass Khronos OpenVX 1.1 Conformance

December 19th, 2016 3 comments

The Khronos Group is the non-profit consortium group behind open standards and APIs for graphics, media and parallel computation such as OpenGL for 3D graphics, OpenCL for GPGPU, OpenVG for 2D vector graphics, etc… OpenVX is one of their most recent open, royalty-free standard, and targets power optimized acceleration of computer vision applications such as face, body and gesture tracking, smart video surveillance, advanced driver assistance systems (ADAS), object and scene reconstruction, augmented reality, visual inspection, robotics and more. The first revision of the standard was released in 2014, and the latest OpenVX 1.1 revision was just released in May 2016.

allwinner-a80-powervr-openvxWe’ve already seen OpenVX 1.1 support in Nvidia Jetson TX1 module & board, but Khronos has a conformance program to test  implementations, and if successful, allow companies to use the logo and name of the API. The version first GPU to pass OpenVX 1.1 conformance is Imagination Technologies PowerVR G6230 using an Allwinner A80 hardware platform and Imagination’s OpenVX DDK. OpenVX 1.1 is said to “expands node functionality and enhances graph framework” compared to OpenVX 1.0.

openvx-framework

OpenVX Framework Efficiency

Imagination Technologies also has a blog post with further details including a comparison between OpenCV open source software and OpenVX.

ARM Introduces Bifrost Mali-G51 GPU, and Mali-V61 4K H.265 & VP9 Video Processing Unit

November 1st, 2016 4 comments

Back in May of this year, ARM unveiled Mali-G71 GPU for premium devices, and the first GPU of the company based on Bifrost architecture. The company has now introduced the second Bifrost GPU with Mali-G51 targeting augmented & virtual reality and higher resolution screens to be found in mainstream devices in 2018, as well as Mali-V61 VPU with 4K H.265 & VP9 video decode and encode capabilities, previously unknown under the codename “Egil“.

Mali-G51 GPU

Click to Enlarge

Click to Enlarge

ARM Mali-G51 will be 60% more energy efficiency, and have 60% more performance density compared to Mali-T830 GPU, making the new GPU the most efficient ARM GPU to date. It will also be 30% smaller, and support 1080p to 4K displays.

Under the hood, Mali-G51 include an updated Bifrost’s low level instruction set, a dual-pixel shader core per GPU core to deliver twice the texel and pixel rates, features the latest ARM Frame Buffer Compression (AFBC) 1.2, and supports Vulkan, OpenGL ES 3.2, and OpenCL 2.0 APIs.

More information can be found on the product page, and an ARM community blog post entitled “The Mali-G51 GPU brings premium performance to mainstream mobile“.

Mali-V61 VPU

mali-v61-4k-120hz

Mali-V61 can scale from 1 to 8 cores to handle 1080p60 up to 4K @ 120 fps, supports 8-/10-bit HEVC & 8-/10-bit VP9 up to 4K UHD video encoding and decoding, making it ideal for 4K video conference and chat, as well as 32MP multi-shot @ 20 fps.

The company claims H.265 and VP9 video encoding quality is about the same for a given bitrate with Mali-V61 as shown in the diagram below.

Click to Enlarge

VP9 vs HEVC vs H.264 – Click to Enlarge

Beside the capability of selecting 1 to 8 cores, silicon vendors can also decide whether they need encoding or decoding block for their SoC. For example camera SoC may not need video decoding support, while STB SoCs might do without encoding. While Mali-V61 is a premium IP block, ARM is also expecting it in mainstream devices possibly also featuring Cortex A53 processor cores and Mali-G51 GPU.

You’ll find more details on the product page, and ARM community “Mali-V61 – Premium video processing for Generation Z and beyond” blog post.

This Video Shows Vulkan API’s Higher Power Efficiency Compared to OpenGL ES API on ARM SoCs

October 20th, 2016 1 comment

Vulkan was introduced as the successor of OpenGL ES in March 2015, promising to take less CPU resources, and support multiple command buffers that can be created in parallel and distributed over several cores, at the cost of slightly more complex application programming since less software work in done inside the GPU drivers themselves with app developers needing to handle memory allocation and thread management.

opengl-es-vs-vulkanThis was just a standard at the time, so it still needed some time to implement Vulkan, and work is still in program but ARM showcased the power efficiency of Vulkan over OpenGL ES in the video embedded at the end of this post.

The demo has the same graphics details and performance using both OpenGL ES and Vulkan, but since the load on the CPU in that demo can be distributed over several CPU cores with Vulkan against a single core for OpenGL ES, it’s possible to use low power cores (e.g. Cortex A53) operating at a lower frequency and voltage, hence reducing power consumption.

ARM also measured that the complete OpenGL ES demo would use 1270 joules against 1123 Joules for the Vulkan demo, resulting in about 15% energy savings in this “early stage” demo.

Categories: Android, Video Tags: gpu, opengl, power, vulkan

HiSilicon Kirin 960 Octa Core Application Processor Features ARM Cortex A73 & A53 Cores, Mali G71 MP8 GPU

October 20th, 2016 2 comments

Following on Kirin 950 processor found in Huawei Mate 8, P9, P9 Max & Honor 8 smartphones, Hisilicon has now unveiled Kirin 960 octa-core processor with four ARM Cortex A73 cores, four Cortex A53 low power cores, a Mali G71 MP8 GPU, and an LTE Cat.12 modem.

kirin-960-block-diagram

The table below from Anandtech compares features and specifications of Kirin 950 against the new Kirin 960 processor.

SoC Kirin 950 Kirin 960
CPU 4x Cortex A72 (2.3 GHz)
4x Cortex A53 (1.8 GHz)
4x Cortex A73 (2.4 GHz)
4x Cortex A53 (1.8 GHz)
Memory
Controller
LPDDR3-933
or LPDDR4-1333
(hybrid controller)
LPDDR4-1800
GPU ARM Mali-T880MP4
@ 900 MHz
ARM Mali-G71MP8
@ 900 MHz
Interconnect ARM CCI-400 ARM CCI-550
Encode/
Decode
1080p H.264
Decode & Encode2160p30 HEVC
Decode
2160p30 HEVC & H.264
Decode & Encode2160p60 HEVC
Decode
Camera/ISP Dual 14bit ISP
940MP/s
Improved
Dual 14bit ISP
Sensor Hub i5 i6
Storage eMMC 5.0 UFS 2.1
Integrated
Modem
Balong Integrated
UE Cat. 6 LTE
Integrated
UE Cat. 12 LTE
4x CA
4×4 MIMO

ARM claims 30% “sustained” performance improvement between Cortex A72 and Cortex A73,  but the GPU should be where the performance jump is more significant, as ARM promises a 50 percent increase in graphics performance, and a 20 percent improvement in power efficiency with Mali G71 compared the previous generation (Mali-T880). Kirin 960 also integrates twice the GPU cores compared to Kirin 950, and some GPU benchmarks provided by Hisilicon/Huawei confirm the theory with over 100% performance improvement in both Manhattan 1080p offscreen and T-Rex offscreen GFXBench 4.0 benchmarks.

kirin960-gpu-performance
The first smartphone to feature Kirin 960 is likely to be Huawei Mate 9 rumored to come with a 5.9″ 2K display, 6GB RAM, and 256 UFS flash.

Imagination Technologies Announces MIPS Warrior I-class I6500 Heterogeneous CPU with up to 384 Cores

October 13th, 2016 No comments

Imagination has just unveiled the successor of MIPS I6400 64-Bit Warrior Core with MIPS Warrior I-class I6500 heterogeneous CPU supporting up to 64 cluster, with up to 6 cores each (384 cores max), themselves up to 4 thread (1536 max), combining with IOCU (IO coherence units), and external IP such as PowerVR GPU or other hardware accelerators.

mips-i6500-scalable-computeThe main features of MIPS I6400 processor are listed as follows:

 

  • Heterogeneous Inside – In a single cluster, designers can optimize power consumption with the ability to configure each CPU with different combinations of threads, different cache sizes, different frequencies, and even different voltage levels.
  • Heterogeneous Outside – The latest MIPS Coherence Manager with an AMBA ACE interface to popular ACE coherent fabric solutions such as those from Arteris and Netspeed lets designers mix on a chip configurations of processing clusters – including PowerVR GPUs or other accelerators – for high system efficiency.
  • Simultaneous Multi-threading (SMT) – Based on a superscalar dual issue design implemented across generations of MIPS CPUs, this  feature enables execution of multiple instructions from multiple threads every clock cycle, providing higher utilization and CPU efficiency.
  • Hardware virtualization (VZ) – I6500 builds on the real time hardware virtualization capability pioneered in the MIPS I6400 core. Designers can save costs by safely and securely consolidating multiple CPU cores with a single core, save power where multiple cores are required, and dynamically and deterministically allocate CPU bandwidth per application.
  • SMT + VZ – The combination of SMT with VZ in the I6500 offers “zero context switching” for applications requiring real-time response. This feature, alongside the provision of scratchpad memory, makes the I6500 ideal for applications which require deterministic code execution.
  • Designed for compute intensive, data processing and networking applications – The I6500 is designed for high-performance/high-efficiency data transfers to localized compute resources with data scratchpad memories per CPU, and features for fast path message/data passing between threads and cores.
  • OmniShield-ready – Imagination’s multi-domain security technology used across its processing families enables isolation of applications in trusted environments, providing a foundation for security by separation.

The processor is also based on the standard MIPS ISA, so developer will be able to leverage existing software and tools such as compilers, debuggers, operating systems, hypervisors and application software already optimized for the MIPS ISA.

mips-i6500-soc

 

The figure above shows what an SoC based on MIPS I6500 may look like with one cluster with 4 CPU cores, 2 IOCUs, another cluster with any CPU cores but instead eight IOCUs interlinked with third party accelerators, and one PowerVR GPU.

Target applications include advanced driver assistance systems (ADAS), autonomous vehicles, networking, drones, industrial automation, security, video analytics, machine learning, and more. One of the first customer for the new processor is Mobileye EyeQ5 SoC designed for  Fully Autonomous Driving (interestingly shortened as “FAD”) vehicles will eight multi-threaded MIPS CPU cores coupled with eighteen cores of Mobileye’s Vision Processors (VPs). EyeQ5 SoC should be found in vehicles as early as 2021.

MIPS I6500 CPU can be licensed now, with general availability planned for Q1 2017.You’ll find more technical details on the product page, and blog post for the announcement.

Nvidia Provides More Details About Parker Automotive SoC with ARMv8 Cores, Pascal GPU

August 23rd, 2016 9 comments

Nvidia demonstrated DRIVE PX2 platform for self-driving cars at CES 2016, but did not give many details about the SoC used in the board. Today, the company has finally provided more information about Parker hexa-core SoC combining two Denver 2 cores, and four Cortex A57 cores combining with a 256-core Pascal GPU.

Nvidia_Parker_Block_DiagramNvidia Parker SoC specifications:

  • CPU – 2x Denver 2 ARMv8 cores, and 4x ARM Cortex A57 cores with 2MB + 2 MB L2 cache, coherent HMP architecture (meaning all 6 cores can work at the same time)
  • GPUs – Nvidia Pascal Geforce GPU with 256 CUDA cores supporting DirectX 12, OpenGL 4.5, Nvidia CUDA 8.0, OpenGL ES 3.1, AEP, and Vulkan + 2D graphics engine
  • Memory – 128-bit LPDDR4 with ECC
  • Display – Triple display pipeline, each at up to 4K 60fps.
  • VPU – 4K60 H.265 and VP9 hardware video decoder and encoder
  • Others:
    • Gigabit Ethernet MAC
    • Dual-CAN (controller area network)
    • Audio engine
    • Security & safety engines including a dual-lockstep processor for reliable fault detection and processing
    • Image processor
  • ISO 26262 functional safety standard for electrical and electronic (E/E) systems compliance
  • Process – 16nm FinFet
PX Drive 2 Board with two Parker SoCs

PX Drive 2 Board with two Parker SoCs

Parker is said to deliver up to 1.5 teraflops (native FP16 processing) of performance for “deep learning-based self-driving AI cockpit systems”.

This type of board and processor is normally only available to car and part manufacturer, and the company claims than 80 carmakers, tier 1 suppliers and university research centers are now using DRIVE PX 2 systems to develop autonomous vehicles. That means the platform should find its way into cars, trucks and buses soon, including in some 100 Volvo XC90 SUVs part of an autonomous-car pilot program in Sweden slated to start next year.

Linux 4.7 Release – Main Changes, ARM and MIPS Architectures

July 25th, 2016 7 comments

Linux 4.7 is out:

So, after a slight delay due to my travels, I’m back, and 4.7 is out.

Despite it being two weeks since rc7, the final patch wasn’t all that big, and much of it is trivial one- and few-liners. There’s a couple of network drivers that got a bit more loving. Appended is the shortlog since rc7 for people who care: it’s fairly spread out, with networking and some intel Kabylake GPU fixes being the most noticeable ones. But there’s random small noise spread all over.

And obviously, this means that the merge window for 4.8 is open.Judging by the linux-next contents, that’s going to be a bigger release than the current one (4.7 really was fairly calm, I blame at least partly summer in the northern hemisphere).

Linus

Linux 4.6 brought USB 3.1 superspeed, OrangeFS distributed file system, 802.1AE MAC-level encryption (MACsec), and BATMAN V protocol support, improved the reliability of OOM task killer, and more.

Linux_4.7_Changelog

Linux 4.7 most noticeable changes include:

  • Support for Radeon RX480 GPUs
  • Parallel directory lookups –  The directory cache caches information about path names to make them quickly available for pathname lookup. This cache uses a mutex to serialize lookup of names in the same directory.  The serializing mutex has been switched to a read-write semaphore in Linux 4.7, allowing for parallel pathname lookups in the same directory. Most filesystems have been converted to allow this feature.
  • New “schedutil” frequency governor –  There are two main differences between it and the existing governors. First, it uses information provided by the scheduler directly for making its decisions. Second, it can invoke cpufreq drivers and change the frequency to adjust CPU performance right away, without having to spawn work items to be executed in process context or similar, leading to lower latency to make frequency changes.
  • Histograms of events in ftrace –  . This release adds the “hist” command, which provides the ability to build “histograms” of events by aggregating event hits. As an example, let’s say a user needs to get a list of bytes read from files from each process. You can get this information using hist triggers, with the following command command:

    other data can also be retrieve by using fields found in /sys/kernel/debug/tracing/events/syscalls/sys_enter_read/format. The output will look like:

    More more details check ftrace documentation and related LWN article.
  • EFI ‘Capsule’ firmware updates –  The EFI Capsule mechanism allows to pass data blobs to the EFI firmware. The firmware then parses them and makes some decision based upon their contents. The most common use case is to bundle a flashable firmware image into a capsule that the firmware can use to upgrade in the next boot the existing version in the flash. Users can upload capsule by writing the firmware to the /dev/efi_capsule_loader device
  • Support for creating virtual USB Device Controllers in USB/IP – USB/IP allows to share real USB devices over the network. Linux 4.7 brings the ability to create virtual USB Device Controllers without needing any physical USB device, using the USB gadget subsystem. For what purpose? For example, for improving phone emulation in development environments, for testing USB and for educational purposes.

Some of ARM specific improvements and new features include:

  • Allwinner:
    • Allwinner A13/R8 – Display Engine support
    • Allwinner A10/A20 – S/PDIF Support
    • Allwinner A31/A23/H3 – DMAengine improvements for H3 audio support
    • Allwinner H3 – USB support (multi-reset line support delayed til 4.8)
    • New hardware supported
      • Tablets – Dserve DSRV9703C, Polaroid MID2809PXE4, Colorfly e708 q1, Difrence DIT4350
      • Boards – Olimex A20 OLinuXino LIME2, Xunlong Orange Pi 2, Orange Pi One, and Orange Pi PC
  • Rockchip:
    • Thermal management – Rockchip driver support for RK3399, RK3366
    • Added Rockchip RK3399 clock and reset controller
    • Pinctrl – Support the .get_direction() callback in the GPIO portions
    • New RK3399 device tree support
    • Added Rockchip DisplayPort PHY support
    • Added Geekbuying GeekBox, RK3399 Evaluation Board, mqmaker MiQi SBC
  • Amlogic
    • Added Meson GXBB (S905) pinctrl support
    • Fixed memory nodes on Vega S95 DTS
    • Added Hardkernel ODROID-C2, Amlogic Meson GXBB P200 and P201 development systems
  • Samsung
    • Added Samsung ARTIK5 evaluation board
    • Added generic exynos bus frequency driver
    • Added pinctrl driver for Samsung EXYNOS5440 SoC
    • DTS updates & fixes:
      • Fix s5p-mfc driver probe on Exynos542x Peach boards (need to provide MFC memory banks). On these boards this was broken for long time but apparently no one enabled this driver till now.
      • Fix creation of debugfs entries for one regulator on Exynos4210 Trats board.
      • Fix probing of max8997 MFD driver (and its children) because of missing interrupt. Actually the current version of the driver probes (just without interrupts) but after switching to regmap and regmap-irq, the interrupt will be mandatory.
      • Cleanup regulator bindings on Exynos5420 boards.
      • Support MIC bypass in display path for Exynos5420.
      • Enable PRNG and SSS for all Exynos4 devices.
      • Add PL330 DMA controller and Thermal Management Unit to Exynos 7
      • Enable accelerated AES (Security SubSystem) on Exynos4412-based boards
      • Enable HDMI CEC on Exynos4412-based Odroid.
      • Add regulator supplies for eMMC/SD on Odroid XU3/XU4.
      • Fix DTC unit name warnings.
  • Qualcomm
    • Qualcomm IPQ4019 support in pinctrl
    • Change SMD callback parameters
    • 96Boards HiKey based on the Hisilicon Hi6220 (Kirin 620) gets an overhaul with a lot of devices enabled in the DT.
    • Added Qualcomm IPQ4019 “Internet processor”,  Arrow DragonBoard 600c (96boards) with APQ8064 Snapdragon 600
    • Device tree changes:
      • Add additional nodes for APQ8064
      • Fix APQ8064 pinctrls for i2c/spi
      • Add MSM8974 nodes for smp2p and smd
      • Modify MSM8974 memory reserve for rfsa and rmtfs
      • Add support for BQ27541 on Nexus7
  • Mediatek
    • Added  CPU power cooling model to Mediatek thermal driver
    • Added Mediatek MT8173 display driver, DRM driver, and thermal controller
    • Added MIPI DSI sub driver
    • 4GB mode support for Mediatek IOMMU driver
    • DTS updates:
      • add pinctrl node for mt2701
      • add mt2701 pmic wrapper binding
      • add auxadc binding document
  • Other new ARM hardware or SoCs – LG1312 TV SoC, Hisilicon Hip06/D03, Google Pixel C, NXP Layerscape 1043A QDS development board, Aspeed AST2400/AST2500, Oxnas 810SE (WD My Book World Edition), ARM MPS2 (AN385 Cortex-M3 & AN399 Cortex-M7), Ka-Ro electronics industrial SoM modules, Embest MarS Board, Boundary Devices i.MX6 Quad Plus Nitrogen6_MAX and SoloX Nitrogen6sx embedded boards, Technexion Pico i.MX6UL compute module, ZII VF610 Development Board, Linksys Viper (E4200v2 / EA4500) WiFi router, Buffalo Kurobox Pro NAS, samtec VIN|ING 1000 vehicle communication interface, Amazon Kindle Fire first generation tablet and ebook reader,  OnRISC Baltos iR 2110 and 3220 embedded industrial PCs, TI AM5728 IDK, TI AM3359 ICE-V2, and TI DRA722 Rev C EVM development systems.

MIPS architecture changelog:

  • Add support for relocatable kernel so it can be loaded someplace besides the default 1MB.
  • Add KASLR support using relocatable support
  • Add perf counter feature
  • Add support for extending builtin cmdline
  • seccomp: Support compat with both O32 and N32
  • ath79: Add support for DTB passed using the UHI boot protocol, remove the builtin DTB support, add zboot debug serial support, add initial support for DPT-Module, Dragino MS14 (Dragino 2), and Onion Omega
  • BMIPS: Add BCM6358 support, add Whirlwind (BMIPS5200) initialization code, add support for BCM63268
  • Lantiq: Add support for device tree file from boot loader
  • Add basic Loongson 3A support
  • Add support for CN73xx, CN75xx and CN78xx
  • Octeon: Add DTS for D-Link DSR-1000N
  • Detect DSP v3 support
  • Detect MIPSr6 Virtual Processor support
  • Enable ptrace hw watchpoints on MIPS R6
  • Probe the M6250 CPUand the P6600 core
  • Support sending SIG_SYS to 32bit userspace from 64bit kernel
  • qca: introduce AR9331 devicetree
  • ralink: add MT7628 EPHY LEDs pinmux support
  • smp-cps: Add nothreads kernel parameter
  • smp-cps: Support MIPSr6 Virtual Processors
  • MIPS64: Support a maximum at least 48 bits of application virtual

For even much more details, you can check out Linux 4.7 changelog with comments only generated using git log v4.6..v4.7 --stat. Alternatively, and much easier to read, you can head to kernelnewbies.org to learn more about Linux 4.7 changes.