@garp
juice explained (again) correct and better than me

@taixzo
what about output of
ls -l /boot (when in harmattan, so /dev/mmcblk0p2/boot()?
Could it be you copied the kernel only to MyDocs/boot and not to /boot? (Of course the listed kernels in MyDocs/boot are only the ubi kernel which needs to be flashed to device)
output of
ls -l /boot
and ubiboot.conf

--
reread and possibly you have old configuration on mtd4/5?
if so, you need to decide to use either of mtd4/5 or MyDocs. Order is mtd4, mtd5, MyDocs
your log files will reside on /var/log/ubiboot*