So, to answer my own question, here is the solution: ;)
As has been stated numerous times on the relevant forums dealing with oscam etc., it is necessary to make sure that cpu-alignment is set to "fixup", which is achieved by the following command:
echo 2 > /proc/cpu/alignment
Myself, I put this line into @/etc/rc.local@, so it will automatically be written on startup.
Hope this helps somebody else as well.
Also, be aware that this should also be done before you even compile tvheadend.
