Just recently, it was announced that the guys now have a Rockbox port with working sound on the Mini 2440 device. So it seems this port is already in a quite advanced state with most of the Rockbox functionality in place. The Rockbox Mini2440 page lists USB and SD drivers as notable missing pieces. So there’s still room for you to join in and help out!
Congratulations guys!
Just as a note: SD-Driver works fine (but slow). Rockbox boots from the SD-card on this Hardware.
Yeah, SDCard is working correctly, but slow for now.
I shot a small video showing the audio working:
http://lyre.sourceforge.net/?q=content/ladies-and-gentlemen-we-have-sound-mini2440