PSP Issues Catch All?

We don't seem to have a troubleshooting thread for the PSP, and I think we could use one.

First for me, I can't get the GBA emulator working on the PSP, I've got quite a few GBA games I'd like to play on the PSP.

I think that this thread probably fits the bill.

Which GBA emulator are you using? gpSP works like a charm for me, but I think that you need the 150 kernel installed. Let me know if this means nothing to you. I would provide more information, but I need to look it all up again myself first!