Hey guys, after alot of hard internet trawling I've managed to come up with a fix for running these gba games that white screen on startup (pokemon ruby / sapphire / emerald for example).

The basic solution I knew already was changing save type to flash 128k, but VGBA doesn't have a simple flash option like its eeprom counterparts.

The problem was that other emulators do the hard part themselves when set to flash 128k in the save options menu, so to make this happen in vgba as well I had to find the FlashRom ID which was no easy task... But here it is:

Just use either 09C2 or 1362 as the FlashRom ID in "Configuration > Hardware options" and then press reset from the menu and fingers crossed it should work fine. There are still some save corruption issues though but all in all it works better than not at all

Hope this works for you guys as well, tested on Pokemon Emerald so far and it works like a charm.