The Cobalt Linux Pages

30. September 2013
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Raspberry PI goes Tablet

Oracle presented the „OpenSource“ tablet DukePad. The real cause for this project is the fact that Oracle release Java JDK for Raspberry Pi, but the Tablet is a creative idea.


Oracle DukePad

Anyway, the cost for the components are about 300 – 400 US Dollar (220-290 EUR), I doubt it will find many Users that are building the Tablet. If you did it, please drop a Note;)! I’m also interested to know which OS you are running, the Rasbian based OSGi-based JavaFX environment or something different like Mozilla’s Firefox OS.

27. September 2013
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Raspberry Pi Model B: rev1 vs. rev2

There are never versions of Raspberry Pi Model B; the most important difference is the increased amount of 512MB memory instead of 256 MB before. But lets have a Look on both:

Raspberry PI Model B revision 1 and 2

Raspberry PI Model B rev1 and rev2

Beside the different parts for the interfaces, you can see the printed „made in UK“ on the rev2 board, while rev1 did not provide any information that it was build in China. You also see a different copyright date „(c) 2011.12“ printed on the board. Finally you may recognize that „P2“ is not populate with a multiple pin strip. But the main layout of the board is still the same.

16. September 2013
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First Steps with Rasbian

Today I freshly installed Raspian on a new SD card; basically it’s just dd’ing the downloaded image to the SD card, e.g. on MacOSX:

sudo dd if=2013-07-26-wheezy-raspbian.img of=/dev/rdiskX bs=1m

Please do not blindly run the command above as you need to know the correct device number, so replace the X with something that indicates your SD card. If you are new to this, good idea is to follow the documentation of RPi Easy SD Card Setup. It contains installation instructions from most common OS versions like Linux, MacOSX, or Windows.

First thing I wanted to figure out is details about hardware and monitoring. I found that the Broadcom VideoCore tools are useful for this and already installed on the system in /opt/vc/. With the command vcgencmd can you e.g. request the core temperature of the Broadcom SoC:

pi@pi2 /opt/vc $ /opt/vc/bin/vcgencmd measure_temp

More details about vcgencmd can be found on elinux.org’s RPI vcgencmd usage page or, with a complete command overview, here:


12. September 2013
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RIP Cobalt, Hello Raspberry Pi

To be honest, I didn’t use my Cobalt system no longer for quite a while now. As I still believe that the design was pretty good and the systems are working without any serious issue, it’s time to make place for new, even better designs and technology.

In the meantime I own two Raspberry Pi‚s Model B Boards:

Raspberry Pi Model B Board

Raspberry Pi Model B Board

It build around a SoC (System on Chip) Broadcom BCM2835 with ARM11 700 Mhz CPU, dual core GPU with 1080p30 Full HD HP H.264 Video Encode/Decode on HDMI port, (XBMC is running like a charm, will report later), one 10/100 wired Ethernet RJ45 port and two USB 2.0 interfaces, Composite video and so on.

Details of the Boards can be found on the elinux.org RPi Hardware page.

9. Januar 2009
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PS3 BlueRay broken after only one year

Since yesterday the BlueRay drive isn’t able to play any BD. Doesn’t matter if you want to play or watch BD Movies. DVDs are still working…

I called Sony Hotline and they said the warrenty in Germany is only one year, but this System is one year and seven weeks old. I have to pay 263 Euro for replacing.

As the system is already out of warrenty I decide to repair it on my own. Replacement parts are only cost about 70 Euro and there are lot of clips on YouTube.com how to open a system, clean the lens of the drive etc.

As I have an „older“ version I need to replace the laser by part number KEM-400AAA, bought one just a few seconds before on eBay.

That is really bad service from Sony and they are really not customer focused, so I decide not go for Sony products any longer. My big Full HD 46″ LCD is from Samsung now, that is my revange for bad service 😉 I’m playing Wii, owning a Nintendo DS….

22. Mai 2008
nach Qube2
8 Kommentare

Poll: The Biggest Disk Size Configuration

After getting a comment from Bas and seeing some questions on the Debian mailing list, I want to know your biggest HD used in any type of Mips/i386 style cobalt machines. Please drop me a comment with you configurations – e.g. what machine, how many drives, which drives – and your experience like performance, stability etc.

Did you ever try to add some additional Card like IDE, SATA or USB (or combi cards) in your Cobalt machine? I would like to know if this was successful or not and what about drivers, performance, power consumption and so on.

What is the use of the storage space? Did you use media streaming (upnp, dlna, daap, etc.), file sharing (nfs, smb, etc.), NAS (iscsi) ore something else?

Please drop a comment with your configuration.

10. Juli 2007
nach Qube2
11 Kommentare

led-set utility for Cobalt server

Today I release the first version of led-set for cobalt machines. Now there are some command line options, a help, getting led status on i386 based cobalt systems, support for MIPS architectures etc.

This small utility is based on the cobalt-panel-utils original provided by Sun Microsystems. This utilities are able to set the LCD of the Cobalt machines and read the Button, but not to set the extra LED some of the machine have.
I own a MIPS bases Qube2 and two i386 machines, the RaQ4r and a RaQ3. The Qube is a great small machine with low power consumption and ideal as use for a home server. The only thing which was disturbing are the bright LED bar on the front and I search for a method to switch it on or off based on the daytime. The both RaQ machines I use with out a FAN to reduce the noise, but if there is some traffic on the machines, the CPU’s may getting to hot. They have a special „Web LED“ which isn’t used outside the original software (all systems are updated to running Debian or Ubuntu in the meantime). I searched for a way to control the LED so that I can build some small hardware extension to control the fan’s, the Web LED is a perfect solution for this.

This ideas lead to this small util led-set.


The building and installing of this small utility is quite easy. The only thing you need is a GCC compiler and make tools installed. To build and install this utility just run:

# make && make install

This will build the utils and copy the executable to /bin/led-set


The usage should not be to complicated. By running the command with the -h option you get the help of this tool:

Usage: led-set [OPTION]...

Mandatory arguments to long options are mandatory for short options too.
-s, --state       return the actual state of the LED as exit code. To display
                  the value you might use the -v|--verbose option too.
                  This is not supported on MIPS, the return will be always 0.
-h, --help        display this help and exit
-v, --verbose     switch on verbose message, e.g. when showing the LED state .
-l, --led=STATE   Set the new state for the LED as numeric value.

Possible States:
MIPS:      0    All   Switch LEDs off
           1    Qube  Front LED bar left on (COBALT_LED_BAR_LEFT = (1<<0))
           2          Front LED bar right on (COBALT_LED_BAR_RIGHT = (1<<1))
           3          Both front LED's
           4    RaQ   Web LED on (COBALT_LED_WEB = (1 << 2))
           8          Power LED off (COBALT_LED_POWER_OFF = (1 << 3))
          15    All   Reset the LED's (COBALT_LED_RESET = (0x0f))
i386:      0    All   Switch LEDs off
           1          LED_SHUTDOWN = (1 << 0)
           2          Switch on the Web LED (LED_WEBLIGHT = (1 << 1))
           3          Switch on the Cobalt/Sun Logo (LED_COBALTLOGO = (1 << 2))

WARNING: There are more possible values for controlling LED you may wish to try.
If you try them you are trying them completely on your OWN RISK! Please
keep this always in mind that this options might be dangerous.

There might additional LED’s depending on your Cobalt machine type. To get (mostly) all supported values you may need to look up the kernel sources for the cobalt drivers, specially the files ./include/asm-mips/mach-cobalt/cobalt.h or ./include/cobalt/led.h, depending on the arch type.

If you find additional combinations, please post this as comment to this Blog entry and let me know which led-state do what on which hardware (machine name and/or systype (cat /proc/cobalt/systype) on i386 machines). If you have questions, ideas or issue, please feel free to contact me too.


6. Juli 2007
nach Qube2
1 Kommentar

Make the web LED work on a Cobalt RaQ3/RaQ4

At the moment i use a Cobalt RaQ4r (system type Pacifica) as a server running Ubuntu 7.04. The RaQ’s have a special LED on the front panel which was used from the original Software to show activities on the HTTP server. This LED is labeled as WEB.

Looking to the kernel sources I figured out that the LED on Pacifica systems is controlled by the ALi M7101 PCI device. So I tried to set the LED with the help of setpci command. This works, but the light is just flash one time, not what I expected. Weiterlesen →