A600, a well known spanish homebrew developer, has set up a page to obtain the Dingoo SDK.

Here are more details from http://dingoo-scene.blogspot.com/

A600 (who wrote the Dingoo overclocking app) at the GP32x forums has confirmed that you can get a Dingoo SDK here: http://x11.gp2x.de/a320

Err, and for those of you who know what you’re doing, there’s this stuff, also courtesy of A600:

I”m uploading all the Ingenic FTP stuff (minus the linux part) to megaupload for those interested.

The full jz_mxu.h:
http://pastebin.com/f442c9e6e

EDIT: Megaupload link (400 MB)
http://www.megaupload.com/?d=JMEHCKGP

The linux part:
http://www.megaupload.com/?d=4F94ECV0

http://x11.gp2x.de/a320