Jean-Luc Aufranc (CNXSoft), Author at CNX Software - Embedded Systems News

April 27, 2011April 27, 2011 by Jean-Luc Aufranc (CNXSoft) - 3 Comments

Gmail with Thunderbird on 2 Computers

If you have setup your gmail account (with Google Apps or not) using POP3 in Thunderbird and want to retrieve your emails in more than one computer you’ll notice that the emails will only go to one of the computer, the first one to download the emails since last download. In order to go around this issue, you have to enable IMAP in your gmail account, by going to to Forwarding and POP/IMAP tab and selecting Enable IMAP then click Save Changes (See screenshot below). On the computer already configured with POP3, you’ll have to create a new account and delete the old one. I basically followed the instructions available at http://kb.mozillazine.org/Convert_a_POP_account_to_a_IMAP_account with some modifications: Backup your profile using Mozbackup in case something goes wrong. Create a IMAP account using Tools -> Account Settings -> Add Mail Account and simply enter your name, email address and password, Thunderbird will configure […]

April 26, 2011April 26, 2011 by Jean-Luc Aufranc (CNXSoft) - No Comments

Ali M3701G: New MIPS based STB SoC

Ali, a Taiwan company, manufacturer of chips for multimedia devices such as DVD player , Set-top boxes, media player has recently announced a new chipset for DVB STB based on MIPS architecture called the M3701G. Here’s an excerpt of MIPS press release (25/04/2011) for this system on chip: MIPS Technologies, Inc.announced today that Taiwan’s ALi Corporation based its new system-on-chip (SoC), which is targeted for the emerging “triple play” market, on the popular MIPS32® 24KEfTM core. MIPS32 24K® cores are widely used across the globe in digital home and networking products including broadband access devices, digital televisions, set-top boxes, and digital media players. … With a hybrid design for DVB-C HD / DVB+IP dual-mode operation, the new M3701G chipset from ALi is targeted for products that support triple play services, such as the next generation of networked media players and set-top boxes. … The M3701G chipset is available now from […]

April 25, 2011April 25, 2011 by Jean-Luc Aufranc (CNXSoft) - No Comments

ARM Based Android Set-Top Boxes at China Content Broadcasting Network Exhibition

The 19th China Content Broadcasting Network Exhibition (CCBN 2011) took place on March 23 – 25 2011 at the China International Exhibition Center in Beijing. During this event, numerous Android STB were showcased with processors from several vendors. Trident Microsystems PNX8400 Trident Microsystems demonstrated their Cortex-A9 Apollo/Shiner SoC family, the PNX8400, which included all the major building blocks needed to develop Next Generation Broadcasting (NGB) solutions. NGB is a government initiative for smart tv in China. On 24th of March 2011, Trident Microsystems also announced that its STB SOCs were selected for the first trial deployments of NGB in China. LG (LG Smart Box) and Cycle Century demonstrated their Android based cable STB using Trident Microsystems NXP8400. This stb supports DVB, Conditional Access, 1080p video streaming, a browser with an Apps store, 3D gaming and VoIP. To see more about Trident Microsystems Android STB have a look at the video […]

April 22, 2011April 22, 2011 by Jean-Luc Aufranc (CNXSoft) - No Comments

Compile with ARM Thumb2 to Reduce Memory Footprint and Improve Performance

ARM claims that Thumb-2 instructions (for ARM Cortex cores and all ARMv7 processors) provides performance improvements and code size optimization: Thumb-2 technology is the instruction set underlying the ARM Cortex architecture which provides enhanced levels of performance, energy efficiency, and code density for a wide range of embedded applications. For performance optimized code Thumb-2 technology uses 31 percent less memory to reduce system cost, while providing up to 38 percent higher performance than existing high density code, which can be used to prolong battery-life or to enrich the product feature set. Thumb-2 technology is featured in the processor, and in all ARMv7 architecture-based processors. Dave Martin (Linaro) has recently posted a message entitled “ARM/Thumb-2 kernel size comparison” on Linaro mailing list:

The question of the size impact of building the kernel in Thumb-2 came
up to day, so I extracted some quick numbers:

$ size vmlinux-*
text	   data	    bss	    dec	    hex	filename
8420507	 463356	 826928	9710791	 942cc7	vmlinux-arm
6715539	 463260	 826928	8005727	 7a285f	vmlinux-thumb2

This is for a recent mainline kernel built with the linaro omap config.

In this case we save about 20% for code and read-only data (i.e.,
text) and 17.5% overall -- which accounts for a little under 2MB saved
in this example.

This doesn't take loadable modules into account; we can probably expect
to see a similar size ratio there.

The question of the size impact of building the kernel in Thumb-2 came

up to day, so I extracted some quick numbers:

$ size vmlinux-*

text data bss dec hex filename

8420507 463356 826928 9710791 942cc7 vmlinux-arm

6715539 463260 826928 8005727 7a285f vmlinux-thumb2

This is for a recent mainline kernel built with the linaro omap config.

In this case we save about 20% for code and read-only data (i.e.,

text) and 17.5% overall -- which accounts for a little under 2MB saved

in this example.

This doesn't take loadable modules into account; we can probably expect

to see a similar size ratio there.

The results provided by Linaro at not as high as those claimed by ARM, but a 20% code size reduction is still impressive. If you want to use Thumb2 to compile […]

April 21, 2011April 21, 2011 by Jean-Luc Aufranc (CNXSoft) - 1 Comment

Is it IPv6 Time ? IPv6 Basics on Linux

The first time I worked on IPv6 was in 2000 in my master’s degree thesis where I started an implementation of Mobile IP based on IPv6 in Linux Redhat. Over a decade later, IPv6 has not really taken off, even though we hear stories about the IPv4 address space running out and I have yet to see an embedded device using anything else than IPv4. APNIC Ran out of IPv4 However, this may be about the change as on the 15th of April 2011, Japan Network Information Center (JPNIC) announced that APNIC (Asia Pacific Network Information Centre) ran out of IPv4 addresses. They will still try to make it last longer by reusing previously allocated IPv4 and an “IPv4 address transfer system” whose details will be made available later. You can also see a chart based on IANA (Internet Assigned Numbers Authority) data that shows this is a problem right […]

April 20, 2011July 17, 2012 by Jean-Luc Aufranc (CNXSoft) - No Comments

Over 40 Percent of Embedded Projects are Behind Schedule

VDC Research has published a research note entitled “Running Behind Schedule: The Crisis in Software & System Development” where they surveyed some embedded and enterprise developers and got the result that over 40% of developers report their project is behind schedule. The worrying fact is that this issue does not improve over the years. It is interesting to note that the average project takes over a year and involves over 30 full-time software engineers. The four main reasons cited for the delays are: Changes in specifications Complexity of the application Customer changed requirements Lack of manpower VDC explains that in the I.T world many are using Agile to manage changes in specifications, this is not the case in embedded market as every industry has very different requirements. There are specific process requirements for embedded systems, but those have been designed for the Waterfall or V model methods , not interactive […]

April 19, 2011April 19, 2011 by Jean-Luc Aufranc (CNXSoft) - No Comments

Embedded Linux Quick Start / Tutorial Videos

Free Electrons recorded some videos from the Embedded Linux Conference Europe, in Cambrigde, United Kingdom on October 2010 by Chris Simmonds, the founder of 2net Limited, a UK company providing training, consultancy and custom software for Linux and other embedded platforms. The videos can either be downloaded in webm HD format at http://free-electrons.com/blog/elce-2010-tutorial-videos/ or you can watch them in HD format below. The PDF slides for the three parts and the lab notes are available at http://elinux.org/images/c/cc/Linux-quick-start.tar.gz The first video (53 minutes) deals with the following key points: Genesis of a Linux project The four elements: Tool chain; boot loader; kernel; user space Element 1: Tool chain Element 2: Boot loader The second video (1h19m) focuses on: Third element: Kernel Fourth element: User space The last video (1h07m) is more practical as it shows how to use embedded Linux on an NXP LPC3250 Stick (ARM9): Description of the hardware Installing […]

April 18, 2011April 18, 2011 by Jean-Luc Aufranc (CNXSoft) - No Comments

Rockchip RK2918 based Set-Top Box and Laptop

Rockchip RK2919 is apparently being implemented in many tablets such as Arnova 10, but they are also used in STB / media players and Laptops. Rockchip showcased their set-top box reference design at Hong Kong Electronics Fair 2010. Their board features 100MB Ethernet, one USB host port, one HDMI video output and one SD Card connector. The BOM cost is around 50 USD. The reference designs runs Android 2.3 (gingerbread). They also exhibited a laptop based on RK2918 supposedly manufactured by one of their customers running Android 2.3. There are no details specs nor price information available yet. But with an ARM Cortex A8 running at 1.2Ghz it should offer decent performance compared to existing ARM based laptops although I’d rather have Ubuntu preloaded (now optimized by Linaro) than Android on this kind of device. Here’s a video by Charbax (armdevices.net) of this laptop. Jean-Luc Aufranc (CNXSoft)Jean-Luc started CNX Software […]