I am having a slight issue with this.
I am able to get the emulator to load from my SD Gecko (In Slot B), but am unable to proceed beyond this:
Pressing anything on my Gamecube Controller does nothing, with the exception of B or X (Which causes a hard reset).
As I am a bad and have a DOL-101, I am unable to verify if this happens on a SP2 device.
emGBA.dol is in the root of the SD, but the roms are not. Placing a GBA rom in the root yielded no difference.
Turns out it was my SD Card. I was using a 64 GB SDXC card (as I have my gamecube ISOs on the same card), and assumed it would work without issue.
Any chance of SDHC/XC support in the future? Sorry for the ramblely nature of this post - I was actively troubleshooting as I wrote it.
EDIT: is it also possible to link this to a GBA/GBP? Like for GBA to GC shennigans/Pokemon related things/Netbattles on megaman Battle Network?