Linux

Posted on by Jean-Luc Aufranc (CNXSoft) - 2 Comments on big.LITTLE Processing Update – In-Kernel Switcher vs Global Task Scheduling

big.LITTLE Processing Update – In-Kernel Switcher vs Global Task Scheduling

big.LITTLE processing is a new technology announced by ARM in 2011 that allows an SoC to feature low power cores (e.g. Cortex A7) together with high performance cores (e.g. Cortex A15) in order to optimize power consumption. I’ve previously detailed two big.LITTLE software implementation methods: In-kernel switcher which runs tasks on either Cortex A7 or Cortex A15 depending on the load, but both processors can not run simultaneously. Heterogeneous multiprocessing (now called Global Task Scheduling) that assigns tasks to relevant Cortex A7 or Cortex A15 cores, and if needed, allows all cores to run at the same time. Linaro has just provided a update for the big.LITTLE software implementation. There are currently only two SoCs that ship in products with Linaro b.L kernel support: ARM’s reference Test Chip 2 (TC2) tile for the Versatile Express development platform, configured as an SoC with 2 Cortex-A15 cores and 3 Cortex-A7 cores. Samsung-LSI’s […]

Posted on by Jean-Luc Aufranc (CNXSoft) - 1 Comment on Lernstift Digital Pen Hits Kickstarter for $150

Lernstift Digital Pen Hits Kickstarter for $150

Lernstift is a digital pen running Linux that aims at helping children learning how to write by vibrating when they’ve made calligraphy or orthography errors. I’ve covered the overall concept in an earlier post, which you can read for details. The company has made some progress, and they have just launched a kickstarter campaign where you can pledge 99 GBP (about $150) to receive the pen later this year or in early 2014. We do know a little more technical details. The first prototype was based on Gumstix Overo (TI OMAP3 or Sitara), but they are now working to design a custom board based on the platform for the final design. The pen comes with 128 MB RAM and runs embedded Linux. In order to gather handwriting data, Lernstift leverages a motion sensor that combines gyroscope with accelerometer, and adds a magnetometer. They’ve got a drawing with Freescale MMA9950L, but […]

Posted on by Jean-Luc Aufranc (CNXSoft) - 10 Comments on Zyxel NSA310 / NSA320 Hackable Network Access Storages Run Debian Linux

Zyxel NSA310 / NSA320 Hackable Network Access Storages Run Debian Linux

Yesterday, we saw how to make a NAS enclosure for the Cubieboard, but DesertF0x commented “Better take a NSA-310 or NSA-320. It is easy to install Debian and it has Gigabit!”, and I decided to have a look. The 2 devices appear to have been released at the end of 2011, and are powered by a Marvell ARMv5 compatible processor. Many NAS are expensive kits, but NSA310 (1 bay) is currently available for $88.50 and NSA320 (2 bays) for $95.34 on Amazon, which is just a little cheaper than the DIY Cubieboard NAS solution (~100 USD). Price looks attractive, now let’s have a look at some technical details, and instructions to install Debian. Both NAS more or less share the same hardware specifications except for a few details: Processor – Marvell Kirkwood 88f6281 ARMV5-TE compliant processor @ 1.2 GHz (Hardware datasheet) System Memory – 256 MB (NAS310) or 512 MB […]

Posted on by Jean-Luc Aufranc (CNXSoft) - 3 Comments on Linaro Connect Europe 2013 Sessions and Mini-Summit

Linaro Connect Europe 2013 Sessions and Mini-Summit

Linaro Connect Europe 2013 (LCE13) is taking place in Dublin, Ireland on July 8 – 12, 2013. If you are not there, you can still follow the event remotely as the event schedule is available with tracks focused on Android, Builds and Baselines, Enterprise, Graphics and Multimedia, Linux Kernel, Network, Project Management Tools and Training, and the Testing and Validation mini-summit will also take place at the same time. There will be hacking and lab sessions each day (except on Friday) where you can expect to learn useful skills. I’ve selected 2 sessions per day that I think might be particularly interesting. Monday 10:00 – 10:45 – ARMv8 Status and Updates Current Status of v8 tree What’s merged? What’s features are next priorities? Platform Updates What members should know about adding new v8 platforms 12:00 – 13:00 – How to make Android more efficient for entry level products The main objective of […]

Posted on by Jean-Luc Aufranc (CNXSoft) - 23 Comments on DIY NAS Enclosure for The Cubieboard

DIY NAS Enclosure for The Cubieboard

The Cubieboard with a 1GHz processor, 1GB RAM, a SATA port and its low price ($49) is probably one the best available options if you want to make your own ARM based NAS. The hardware is easy to get, most of the software components (Linux, SAMBA/NFS server, Bittorrent client, etc…) are available, but there are no NAS enclosure available for the Cubieboard, so this part may be a little tricky. Cubieforums user Vustus has a pretty neat and cost- effective solution for an enclosure based on off-the-shelf parts. If you want to try it yourself, you’ll need the following parts: 3.5″ USB 2.0 aluminum external dual SATA HDD enclosure ($15) – http://www.geeks.com/details.asp?InvtId=ET-3541S 10″ Flat SATA cable ($2.49) – http://www.newegg.com/Product/Product.aspx?Item=N82E16812119365 SATA Y cable for power ($4.99) – http://www.newegg.com/Product/Product.aspx?Item=N82E16812198015 Power cable for th Cubieboard (taken from PSP power supply, as a cable would cost about $7 according to vustus) ($4.29) – http://www.amazon.com/gp/product/B002TK3GH8 […]

Posted on by Jean-Luc Aufranc (CNXSoft) - 10 Comments on Cloud Media FreeOTT Player Review

Cloud Media FreeOTT Player Review

Syabas was a company designing set-top boxes such as Popcorn Hour Media Tank that were relatively popular before the Android media player invasion. The company is now called Cloud Media, and they offer a tiny media player called FreeOTT that connects to their Apps Market and bring online video, Internet radio, social media and other streaming media to your television. The device is free (as in free beer), as it’s not actually available for sale to the general public, and the only ways to get it is to have your ISP or telecom provider set it to you, or win one from the regular giveaways organized by the company. I won one via a giveaway announced on their Facebook page, and I had just to pay $5 (via Paypal) for shipping. The company does not provide detailed specifications for their device but we do know it’s a Linux based media […]

Posted on by Jean-Luc Aufranc (CNXSoft) - 75 Comments on 12MB Minimal Image for Raspberry Pi using the Yocto Project

12MB Minimal Image for Raspberry Pi using the Yocto Project

Last year, I wrote instructions and provided a download link about a minimal image for Raspberry Pi based on Raspbian. The compressed image is 84MB, and the good thing about it is that you can just use apt-get to install packages. The problem is that it’s not actually that small as once it is uncompressed the rootfs is still a massive 414 MB. So today, I’ll explain how to create a smaller (and custom) image using the Yocto Project, a platform that let you build an embedded Linux distribution matching exactly your project’s requirements. Other advantages are that the build is configurable with config files, so it’s easily reproducible with a few command lines, and it might turn out to be useful to learn more about the Yocto Project as many boards and SoC are now making use of the framework, including Freescale i.MX6 (Wandboard, Olinuxino-imx233, Sabrelite, etc…), the Beagleboard, […]

Posted on by Jean-Luc Aufranc (CNXSoft) - No Comments on Alpha Data ADM-XRC-7Z1 XMC Mezzanine Card Powered by Xilinx Zynq SoC

Alpha Data ADM-XRC-7Z1 XMC Mezzanine Card Powered by Xilinx Zynq SoC

Alpha Data, a company providing solutions for compute intensive applications, has announced the ADM-XRC-7Z1, an XMC board powered by Xilinx Zynq-7045 or Zynq-7100 Cortex A9 + FPGA SoC targeting application such as software-defined radio, radar and sonar processing, image processing and machine vision. If you are like me, and have never heard about XMC mezzanine cards before, here’s what Wikipedia has to say about it: XMC, or Switched Mezzanine Card, is a PCI Mezzazine Card (PMC) with high-speed serial fabric interconnect defined by the VITA 42 standard. XMC specifies a 5th connector (“P15”) that supports PCI Express (VITA 42.3) or other high speed serial formats such as Serial RapidIO (VITA 42.2) and Parallel RapidIO (VITA 42.1). VITA (VMEbus International Trade Association) is an organization developing and promoting open technology standards that you can download for a fee. Here are the specifications of the board: SoC – Xilinx Zynq-7045 or Zynq-7100 dual […]

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