There are still some bugs here and there, but the kernel now supports all the hardware of the RS-90: mth got the LCD screen working, I worked on getting the sound output, USB networking, and NAND support in the bootloader, and zear worked on a ADC driver for the SELECT (and apparently, L) button, and a driver for the battery.
The focus now is to bring a GUI for this little handheld. We could use GMenu2X, but we need a new theme for the 240x160 screen. Also, we need to create an installer to automatize installation of the custom firmware from USB, just like in the good old Dingoo A320 days.
But now I can play Pokémon again, and under ReGBA this time 😀