Some resources for developing (on) the DSO Nano.
See Building the source with gcc. To build with IAR, see the Links section below.
Please share your modifications at the DSO Nano forum. The best is to post a "diff" from the git repository. E.g. "git diff > mypatch.diff and post the mypatch.diff instead of uploading the whole code tree. Even better is to learn git and make real patch series. Or publish your own git tree somewhere (gitourious.org, github.com etc).