this git is only for xburst cpu upstreaming works or co-works, nothing relate to openwrt-xburst.git, please use openwrt-xburst/target/linux/xburst for the last NanoNote kernel

take a look : http://en.qi-hardware.com/wiki/Building_Software_Image you can just compile kernel by:

make target/linux/install

then you will got patched kernel source at : ...openwrt-xburst/build_dir/linux-xburst_qi_lb60/linux-2.6.32.25/