I´m new in this forum. I have Raspberry Pi 2 with OpenElec (with a small SD for System partition and Storage partition in USB). I would like to habe Retropie too with the same SD and USB. Is it posible? I would like to execute Retropie from OpenElec. A dual boot will get too.
You can’t use openeelec with retropie per se. What you can do is a dualboot setup. Either use Noobs with a Rasbian/OpenElec installation or use Berryboot with the same (i think there’s a Retropie 2.6 squashfs (needed for Berryboot) floating around in these forums). Beware that Noobs will default to splitting your sd card “in half”, every os-partition will be the same size.
Alternatively you can just install Kodi on a Retropie Installation.
There’s an option in the retropie_setup script, I think in the experimental subfolder. I think you can install all addons since it installs a full Kodi installation. It could be slower than a separately installed OpenElec, since OpenElec is a bare-bones Kodi without much in the background (no complete Rasbian running) and is optimized to run exactly that, Kodi, but I’m not sure. Last time I tried that, it ran pretty smoothly but could have been a bit slower and laggier than a separate installation.
Lakka is a retroarch distribution that is forked from openElec. It seems that it only supports playing retroarch cores and not any standard kodi features. I don’t know if there is any plan to add normal kodi to lakka.
I found a tweet from lakka.tv that said that if you want to use kodi you need to install openelec…