After months, today I managed to get Kodi work in my OpenATV 7.4. In this way
- I downloaded this file from OpenaTV forum
- and copied the 7.4 content in /usr/bin decoder folder
- then modified the file advancedsettings.xml (in /usr/share/kodi/system), to set Enigma2Player instead of E2player as Kodi default video player.
Now I have Kodi working in OpenaTV 7.4
Warning: with this release (7.4) it occurs that Kodi freezes.
In that case, reboot and put the usb with saved settings.