possible progress on XO-1 camera issues

[Daniel Drake]

Hi,

Jon Corbet's been working on the XO-1.5 camera driver for us, and while
doing so he found a V4L2 bug which is probably one of the reasons that
we're having problems with XO-1 camera on all post-8.2 builds.

The workaround is to build the sensor driver into the kernel, and the
camera driver as a module.

I've made the equivalent change for the kernel that has been built here:

http://xs-dev.laptop.org/~dsd/repos/f11-xo1/kernel-2.6.31_xo1-20091211.1834.1.olpc.813348c.i586.rpm

Untested, just wanted to get the word out.

Note that you may have to load the camera driver (cafe_ccic) manually,
if it doesn't automatically get loaded.

Word is going round that on a SoaS build for XO (which uses something
close to OLPC's 2.6.30 kernel, I think), someone recently managed to
capture a photo from the command line.

If someone is up for a small task, it would be good to start changing
these "words going round" to some actual solid information. Anyone want
to head up these efforts and to start
http://wiki.laptop.org/go/Reviving_XO1_camera ?
At the very least it would be nice to have some solid documentation on
where the problem is (and isn't). Is it in ov7670, cafe_ccic, v4l2,
gstreamer, xf86-video-geode, or..? How can you tell? Does the above
kernel help? What's the exact command you can use on F12 SoasXO to take
a photo? What's the corresponding error if you do that on F11? etc.

Daniel