People at minidso.com (the original designers of the Quad) have released an official GCC port of their latest app (PLUS V1.06). The download links are here: minidso.com/bbs/read.php?tid=67 (browse to the end of the post).
Thanks for your sharing. 
When I use this firmware it crash when I enter the menu (pressing the [] ) and scroll down. the original 1.06 (the official one) will work fine. What is wrong?
I got HW v2.7, SYS 1.52.