Cyan
The sizes of Wii savefile and Windows are same or not? If yes then please try Wii savefile in Windows. If no, then Wii generates wrong save files which may cause many games to not working or maybe it's even the source of white/black screen issue.
scanff,
This not a tool. devkitpro has function that returns amount of free mem in bytes - SYS_GetArena1Size(). But 1.3Mb was a couple of weeks ago.
We can get enough free memory by move something into MEM2. But I don't think that we need to bother with this right now.
1) Right now we have about 1.3Mb free. It's too low for dynarec cache.
2) Even interpreter is not complete yet.
3) To write a working dynarec you need to know both arch's at a good level. As I know, no one from devs knows PPC or ARM at this level. It will take a lot of time to study them...