I don't have a Hacker Board yet but I have been playing with the C1 for a while.  I won't need the Arduino connector headers as the expansion header on top will do just fine.  I would like to see more RAM though; 256MB or more would be nice.

SUMMARY WISHLIST

Double the RAM to 128MB or larger if at all possible - though I don't think the chips exist now so it might not be - there a many router/network/cache projects that work better with more space and swap helps but is slow.

For the LiPo: add a 10k with a solder bridge or stuff option or 2 pin 0.1" socket so if the battery doesn't have a thermistor I don't need to hack cables, just connect an external thermistor or a 10k - if it does have a thermistor, just route to the pin; for the actual battery connection change to the more common 2 pin JST, or use 0.1".  Maybe a connector as: GND THERM PLUS GND.

Add a 2 pin 0.1" connector paralleling the white reset switch so it can be made external or remote.

For mic and speaker - 0.1" posts or sockets or just run them to the 40 pin (make it a 50 pin if needed).  Right now I have to hope Sparkfun or someone else has chumby refurb parts.  No two connectors are the same, nor are they something easy to find.  I didn't have any problem with the serial console because it is standard.  You have this kind for the knob, pwm and A/D.

So basically everything should be a 0.1" connector except the LiPo which might be a 2 pin JST with a 0.1" for an optional thermistor.

And to add, a 0.1" perf board (like the upcoming VGA board) should be able to mate with all the connectors - maybe replace the pins with sockets so anyone could take a standard 0.1 perf board, add pins in all the right places, and connect to everything.  (avoid the Arduino shift).

This part is non-fedora but another piece in my quest for an instrument cluster

http://wwww.zdez.org/acceldemo.tgz - www and cg-bin files.  HTML5 canvas webapp that displays a square based on the accelerometer reading.

First pass proof of concept, but it moves or resizes (z axis) as I tilt or move the board.  Works on firefox, Android, and iOS safari.

Two more things - the rotary encoder, and the "bend sensor".  How do I read them, or are they already implemented so I just have to do a read from a device?  The encoder is standard, but I can't find info on the bend sensor - is it just a switch or something more?

The fedora script kit above is working well.

You can replace the initial wget and download the rootfs manually, and the package list files from the same site from:
http://ftp.linux.org.uk/pub/linux/arm/f … /(package) and copy them to var/cache/yum/arm5tel/\$releasever/fedora/packages/ so yum won't have to (or do it on one board and copy out the set).  $releasever gets renamed to "12" when yum runs and installs.  You need to do the install as it does scripts that set things.  But for now, the script and yum will download what is needed.

The only thing I had to do so far to get the fedora working completely is to set a vnc password:
(path is /root/.vnc/passwd in the fedorastart script).
mkdir /root/.vnc
vncpasswd /root/.vnc/passwd
(enter and verify password).

(After the base installation, running "fedorastart.sh" brings everything else up - you might want to add wifi init too; the X server comes up, avahi, bluetooth, even VNC, but you can't get it without creating and using a password)
The fedorastart might have an old version using a swap partition, if it says "swapon /dev/mmcblk0p7", change it to "swapon swapfile", or create the swap partition and remove the swapfile.

Note that only ssh as a service is published for Bonjour.  For web service, you need to do "avahi-publish -s ChumbyWeb _http._tcp 80 &", and _rfb._tcp 5900 for VNC, but that doesn't affect the dns, i.e. http://chumby.local, only bonjour browsing.

One thing missing is either a high speed timer or high speed IO (or get SPI2 working).

I have an app where I need to measure pulse widths of 64uS to 200uS.  I can do it with many AVRs but then how do I get the data to the Chumby?  Or a GPS?  The serial port is allocated for the console.  I2C is a bit slow for the higher rates.  Maybe bitbang the SPI?  I can add a USB UART or other device, but that seems like overkill.  I would prefer another UART or two to an accelerometer (maybe even USB like the Atmel on the new Arduinos or an FTDI).

I now have bluetooth keyboard and mouse under X in my fedora rootfs.  Of course I have things like serial ports (for gps, etc), and am working on audio

The first thing so far which I find BROKEN!!!.  I can't build kernel modules for the hacker board.  There is NO kernel source which builds the IDENTICAL binaries (this is required by the GPL!), the /lib/modules/2.6.../build directory points into a nonexistent directory (which is all I would really need).

I rebuilt the kernel source pointed to around here with the falconwing tools also from here, and it builds a DIFFERENT BINARY!!!.  I can't build a kernel module for the rtl8188 USB module that works - it says the module format is invalid when I try to load it.

WHERE IS THE SOURCE? - The complete source to the actual binary or the complete build directory to ANY SD image - the one distributed with the hacker board or any other that works with it?

Meritline has the EDUP and AirLink.  Both work with an updated kernel and driver,

EDUP doesn't show a green LED (without hacking).  There are steep discounts for 2 packs or higher.

http://www.meritline.com/11n-wireless---c-13694.aspx

Could you give me some pointers as to how you did this? What kernel did you use from the source section on the chumby site? and how did you compile the module? No real need for step by step but some help would be appreciated.