• Registered: 2008-01-18
  • Posts: 10

Topic: Killing a Chumby (and its resurrection thanks to open schematics)

Hi, I just posted a blog entry about the murder and resurrection of my chumby.
Read all about it here:
http://totalueberwachung.de/blog/articl … esurrected

I'm pretty convinced that this happened because of reversing polarity, but actually I rechecked the schematics and it appears that there are diodes between POWER_RAW and DCIN_PROTECTED to prevent exactly that from doing any harm.
What do you think about adding a bridge rectifier right after the DC power input? The AVR STK500 development board does that to have well known positive and ground terminals.

Thanks again for making the schematics open! Without them it would have been considerably harder for me to repair the damage.

  • Registered: 2007-11-09
  • Posts: 59

Re: Killing a Chumby (and its resurrection thanks to open schematics)

Great Work.

I have some questions about openmoko and openembedded distro:
Do you have a functional rootfs Image? if yes, This image support Graphics?
GPE runs on chumby?


Can you share the config file with us?

In this page you write:

". Booting from USB stick works, though, which is what we'll try to optimize for now."

and ..

"so the kernel needs to be patched to ignore the cmdline arguments and use it's default"

How can i do that?

Can you share this patch?


Best Regards

  • Registered: 2008-01-18
  • Posts: 10

Re: Killing a Chumby (and its resurrection thanks to open schematics)

Since this is the Hardware section we should probably continue this discussion in: http://forum.chumby.com/viewtopic.php?id=1535

Basically everything we're doing is checked into openembedded as soon as we trust it enough not to horribly break anything. The patch and defconfig we're using is at http://www.openembedded.org/filebrowser … mby-kernel

The image and kernel mentioned in the other thread are functional, but just boot into a console image. You should be able to attach a USB keyboard and log in.
That would look like this: http://totalueberwachung.de/~alphaone/g … jpg.0.html
I have produced an openmoko-image, but that is way too big for the 22MB rootfs partition. Because we're not willing to mess around with the partitions just now (and I believe many people wouldn't want to) we came up with the kernel that boots from a USB stick. Our goal is to have a "multiboot" kernel that will boot the original cramfs if no USB stick is inserted and the rootfs on the USB stick otherwise.

This is still an ongoing process, so don't expect everything to work flawlessly. The openmoko-image boots into the X calibration screen, but there the touchscreen doesn't work and the screen is flickering. We'll announce new versions of the openembedded images in the thread mentioned above, so stay tuned.