The cores in the RetroPie image are already installed and any additional emulators you compile will have the core with it. RetroArch flatpak on the desktop is different, if you’re running 64bit you’ll need to source your own. This repo contains 64bit RetroArch cores.
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The easiest way to get this running is to use the RetroPie distro Rex made, as he states you’ll have to find a source to download the cores if you install RetroArch yourself.
His distro is setup and ready for ROMs…
I put a few different distros on sdcard and simply shut down and swap cards when I want to run RetroPie.
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seems a good move. I’ll do that. how do you drop your ROMs on your sd card? I would like to copy them via the file manager but the controls doesn t work (5 copy etc) .thanks a lot
I just flashed the image made a user picked my device shutdown. Then on my computer put the roms on the sd in ~/RetroPie/roms/ I’m not sure if there’s an easier way that’s just the way I did it. Are you holding the Fn key when pressing 5?
rhe pc with the ROMs os on windows, I just see the Boot partition of the sd card, I think I need to install a linux partition reader to see it. for the 5, I’ll test again but I hope I didn’t make this simple mistake 
.
I don’t know how to mount EXT4 on windows, but you could enable ssh in raspi-config then scp the roms to the uConsole.
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thx ! on ppsspp the screen is rotate on every games, if you have a clue?
yeah, my bad, actually I just drop the sd card on another laptop I have linux on and copy everything in roms. Sorry for the noob mistakes >
However on ppsspp the games launch with rotation. And I don’t found a way, if you have some ideas. thanks again
Did you change any configs? Everything that is installed out of the box is rotated correctly except the RetroArch menu that can’t be rotated.
Go into the RetroArch menu and go to the ppsspp core and see if you can rotate it there.
About the settings I change, Out of the box, there wasn’t ppsspp so I installed it via manage optionnal packages.
and in retroarch, I don’t found the ppsspp to change the rotation. Actually, in /video/output/videorotation there is a possibility to rotate but that’s it
lr-ppsspp is installed by default in the image. Check and uninstall the regular ppsspp and make sure lr-ppsspp is installed.
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The lr-ppsspp core respects Retropie’s settings, including screen rotation. The ‘standalone’ PPSSPP core does not. Make sure you are using the lr-ppsspp core.
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I uninstall ppsspp and reinstall lr-ppsspp, now at launch I just have an half grey screen, no matter what rom i launch
yeah I’m sure it works for you. What setting would you like to see? retropie?
Here’s my process.
Step one: See if it works on my device.
Step two: Figure out what’s different between our setups.
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Can you send me screenshots of
Core options > System
And
Core options > Video
yeah, of course, I’m not clear. I mean if you want to know what changed on my distro, there is raspi config , retroarch and retropie setup. But the main changes was in retroarch rotate screen. I just load defaut config files and the game launch. But rotate 90 degre and zoom x4 
. I have to found what setting I change too./
Oh, you’re not using Rex’s Retropie distro?
Yeah, the Flatpak version of Retropie’s going to be a bit weird since it’s running in a different system in a container.
I also find that if Retroarch is running in X11 or Wayland performance is significantly worse on the CM4 compared to running it directly on the framebuffer.
Actually I tested both. Flashing diffrents card. Right now some games launch in the good rotation. I think I’ll reflash Rex Retropie distro