Gnome Documentation Hackfest Thu, Mar 17. 2011
For the next six days, CDOT is hosting some members of the of the GNOME documentation team for a documentation hackfest in preparation for the upcoming GNOME 3.0 release. On Friday we're holding an informal lunchtime talk to introduce the Seneca and Gnome communities -- and if you're in the greater Toronto area and are free, you're welcome to join us!
Fedora ARM PandaStack Wed, Mar 9. 2011
The PandaStack I mentioned previously - a stack of PandaBoards mounted on threaded rods, powered by a modular ATX power supply - is now a fully-functional part of the Fedora ARM project koji buildsystem.
For anyone interested in building a similar stack, here's the parts list and assembly instructions:
- 15 PandaBoards (or whatever quantity you wish to stack; the photo here shows 11 boards, since we have temporarily removed 4 for various device driver test projects)
- 15 barrel connectors
- 1 ATX 750W modular power supply (note: higher-rated power supplies may not have more current available on the +5v rail, which is what is used in this project)
- 4 threaded #4-40 stainless steel rods. (Note: BeagleBoards accept a #6-32 thread, but PandaBoards have smaller mounting holes).
- 1 pack (100) 0.25" nylon spacers
- 1 pack (50) 1.25" nylon spacers
- 2 packs (10) stainless steel acorn nuts
- SD cards, ethernet cables, network switch
- hacksaw, soldering iron, solder, wire strippers, heat-shrink tubing, heat-shrink gun (or embossing craft gun), multimeter
Cut the threaded rods to size with the hacksaw. Stack the boards on the rods, reversing the orientation of every second board so that it is upside down with the ethernet jack facing the opposite side of the stack; this will result in ethernet and power jacks down two opposite sides of the stack, with serial ports on another side and no connectors on the remaining side (which is the "bottom" of the stack). Use the 1.25" spacers between adjacent boards in a right-side-up/upside-down pair, and the 0.25" spacers between pairs. The grounding strips on the top of each ethernet/USB connector tower will just touch the plastic cases of the LED drive transistors on the adjacent board in each pair. Fasten the stack with the acorn nuts.
Gather the barrel connectors in groups of five. Connect each group to the +5 volt (pin 1) and ground (pin 2/3) leads of a molex connector from the ATX power supply (cutting off the cable connected to the molex connector, and ensuring that the barrel connectors are wired center-positive). Solder, then insulate with shrink-wrap tubing. Take the motherboard connector of the power supply, pull off all of the leads except pins 8 (PWR_OK) and 16 (PS_ON), solder those leads together, and insulate with shrink-wrap tubing. Plug the molex and motherboard connectors into the ATX supply.
Place the stack on its side on a wire shelf for convection cooling. Test the power supply leads to ensure you're getting a solid +5 volts, burn and insert your SD cards, connect your ethernet cables, and connect the boards one at a time to the power supply unit with the barrel connectors.
Enjoy your silent tower of computing power!
Running Fedora ARM without ARM Hardware, Made Easy Mon, Feb 28. 2011
Interested in ARM but lacking ARM hardware? Not a problem! Fedora includes support for ARM virtual machines, and I'm packaged up a preconfigured ARM VM for your convenience:
- ARM virtual machine package: http://scotland.proximity.on.ca/arm/armvm/noarch/armvm-f13beta1-15.fc13.noarch.rpm
- Repo config for staying up-to-date on ARM VM releases: http://scotland.proximity.on.ca/arm/armvm/noarch/armvm-release-1-1.fc13.noarch.rpm
The armvm package will install a preconfigured ARM virtual machine named "f13-arm-beta1" with a 2GB image and a 128MB memory footprint. Since x86_64 processors don't provide hardware support for ARM processor virtualization, the ARM VM will run slowly compared to i386/x86_64 VMs, but the performance should be tolerable on most machines (Atom netbooks excepted). You can manage the VM with virsh or virt-manager. I've tested these packages on F13 and F14, but not on F15 Alpha yet. (By the way: the root password on the VM is "fedoraarm").
(Please don't forget that both the Fedora ARM beta release and the armvm package are very definitely at the pre-release/beta stage of maturity. In particular, updating the armvm package will REPLACE your arm VM with a new image - beware!).
PandaStack Tue, Feb 22. 2011
Our "PandaStack" of PandaBoard builders (shown here with 9 of the 15 builders installed) is now ready to run as part of the Fedora ARM build farm. However, I've run into a weird problem -- the ATX power supply I bought to power the boards works fine with 1-3 boards, but Something Bad happens when a fourth board is connected. It's not a capacity issue as far as I can see; it seems to be related to noise. Time to borrow a scope and take a close look at waveforms ... in the meantime, we'll power some of the boards with the ATX supply and some with stand-alone power bricks.
Coyotes on the Runway Sat, Jan 29. 2011
So I've safely arrived at FUDCon. Oddly, our plane was delayed for two reasons: the inbound flight was late due to a storm in Winnipeg (not so odd), and there was a "Coyote Strike" by a plane that landed just before we took off -- so they had to check that the runway area was animal-free before we were cleared for takeoff.
Coyotes in Arizona, yes. But Toronto?!
Looking forward to a great day of talks tomorrow! Hope I have two brain cells awake to rub together -- doubly so for the students, who are now on the prowl for food...
Changing the Open Web Fri, Jan 28. 2011
My colleagues in the Centre for Development of Open Technology have been doing some amazing work enhancing the open web. One of their libraries, Popcorn.js, enables web video to move beyond being a box on the page to become a part of the hyperlinked, dynamic web. With a ton of frantic hacking by the Popcorn team which began on Tuesday morning (!), PBS launched an interesting web page that night showing analyst's comments synchronized to a video of the US President's State of the Union speech. PBS comments about the effort are posted on The Rundown.
Update: Dave Humphrey has blogged about the work that he and his team did on the SOTU page with PBS.