Team Bomba's g9klib has recently been updated to version 0.60. With this great library you can easily develop assembly programs for the GFX9000. In this new version support for RAM fonts was added.
The accompanying tool, bmp2g9b, which you can use to create the g9b files the g9klib uses, has also been updated. New in this version:
- code was rewritten to make it portable to linux
- YUV support added
- YJK support added
- optional dithering added
- 1 bit BMP support added
The new g9klib can be downloaded right here.
Relevant link: http://www.teambomba.net/gfx9klib.html