Libfat and datel sd media launcher

[HudsonBr]

Hello,
For load my codes to test in real hardware, I am using Datel SD media launcher.
when i use the libfat, the .dol file loads and the screen stops in black, if i remove the SD loader the .dol continues to run.
Seems the libfat is trying to read from the 2 slots of memory card. There is any setup to be done with libfat?
There is docs about libfat?

Thanks in advance.