Awesome. When do you think you can post it here?

Also, was the rom tested? Does load in an emulator?

I'll be posting it on the FPC 4 GBA site, of course, so that others can help to start working on the basic hardware libraries... sound, video, etc...

As a great guide to these things I'd recommend going to the link with the book 'Programming The Nintendo Game Boy Advance' on the FPC 4 GBA page.