Finally solved - for all other people facing the same issues:
Change /boot/boot.cmd from:
setenv bootargs console=tty1 root=/dev/mmcblk0p1 rootwait .... loglevel=1
to:
setenv bootargs "coherent_pool=6M console=tty1 root=/dev/mmcblk0p1 rootwait .... loglevel=1"
then make a backup of /boot/boot.scr (e.g. boot.old) and regenerate boot.scr:
mkimage -C none -A arm -T script -d /boot/boot.cmd /boot/boot.scr
And for all other users that want to get v4l devices, not supported in kernel by default, working -
you have to recompile the image yourselves - as Igor seems not to change MEDIA_SUPPORT=Y
to MEDIA_SUPPORT=m (and VIDEO_DEV=Y to VIDEO_DEV=m) in his builds. This could be an
oversight - so take this just as a reminder - to save some people compile and troubleshooting time.
Greetings,
h0ly0ne