[Discussion] 60FPS patches for PSP games that run at 30FPS

[JJXB88]

Is there a way to trace which bits of assembly are calling an instruction? been trying to see how Phantasy Star Portable 2 uses sceDisplayWaitVblankStartCB but finding no tools in the ppsspp debugger. also, is it just me or does changing the values of anything within PSP memory using cheat engine just plain not work? i have mem_mapped enabled and i can find things. but i can't modify them because they either then display question marks and become invalid or crash PPSSPP.
the most i managed to get out of PSP2 is for it to run at 60 but way too fast by messing around with the core sceDisplayWaitVblankStartCB syscall. but i know that's a truly stupid method so i didn't get further.