I develop OLPC based on Slackware base. Most page on slackware source is below:

http://slackware.cs.utah.edu/pub/slackware/slackware64-current/

For my old OLPC image, I put it at:

http://supat.eu.org/OLPC/

You have to have XO-1.0 to use that image.

I am sure that .img cannot work on new X0 1.5

Other explicit knowledge you can get it from git of OLPC.

good luck,

zxc555

ps If you are developer you will understand my above messages well.

It was useless for users but valuable only to developper.

For users, the best solution is attending my work shop.