I would recreate the Extensions.mkext. Mostly random KPs are because of an damaged .mkext.
start with -x arch=i386
start terminal
sudo -s
kextcache -v 1 -t -l -a i386 -m /System/Library/Caches/com.apple.kext.caches/Startup/Extensions.mkext /System/Library/Extensions

Do you have any /EXTRA folder ?
Then also update .mkext there
kextcache -v 1 -t -l -a i386 -m /Extra/Extensions.mkext /System/Library/Extensions

If you have an MBR partitioned HD (not GUID) Chameleon + PC EFI cant work with subfolders 10.5/10.6 remove them.

If you have GUID (EFI) partitioned HD your EFI partition (200 MB) must be mounted to get the above update of mkext worked. Also your path to the .mkext on efi must be chaned for that command line kextcache.