I have installed the devkitadv and CHN's conversion stuff and I get the following error when I try to build the GPTEST program:
C:\Djb\gp32\devkitadv\gptest>make -f Makefile
c:/djb/gp32/devkitadv/bin/arm-agb-elf-gcc -DLITTLE_ENDIAN -DGP32 -mcpu=arm9tdmi
-mtune=arm9tdmi -fexpensive-optimizations...