Hi. I'm a frequent user of the RetroArch port of FBA on Wii, but unfortunately there's a lot of non-working games on this platform, one reason for which is its big endian CPU. A while ago, a user (Tanuki) compiled an exhaustive compatibility spreadsheet, which has since been kept relatively up-to-date by another user (oji). The most recent version can be found in
this post as of right now.
Now, a number of the games with issues are essentially unrelated to the mainline code; e.g. many games have controls which aren't mapped to RetroArch equivalents and others simply fail to fit into the Wii's limited RAM. However, some do seem to be endianness-related and some with less obvious failure states (like black-screening) could be anything. Since at least some of these issues appear to be upstream, I figured I'd report them here rather than on the libretro bug tracker.
Listed below are a handful of "big-name" games which could possibly have endianness-related issues. This basically means games that I like or am otherwise aware of, but hopefully demonstrates that the issue affects both prominent and obscure games. A good test is to compare games on a little-endian version of RetroArch, which I can't currently do personally, but which was already done by comparing against RetroArch on PC for some games in the compatibility list. Only games which have issues on Wii but are known to work on PC are listed below.
Garbled (wrong endian?) graphicsbionicc (Bionic Commando)
joemacr (Joe & Mac Returns)
osman (Osman)
pbobble (Puzzle Bobble)
terracre (Terra Cresta)
terraf (Terra Force)
Other Wii-but-not-PC issuesfunkyjet (Funky Jet); input is broken
geostorm (Geo Storm); blackscreens--most Irem stuff does the same (same behavior on Android; likely not endian issue)
liquidk (Liquid Kids); upside-down sprite rendering
raiden (Raiden); blackscreens
The above is by no means exhaustive, nor meant as a slight against any games not included here. Also, I apologize if any of these are libretro issues rather than being endianness-related. Thanks for any interest.