Gecko OS Source?

I am trying to boot the disc in the drive. I had a look at this: [forum.wiibrew.org] So where can I obtain the source code to Gecko OS.

You can get it here.

Gecko OS has a lot of rebooting and video mode code, which will confuse you. I suggest you have a look at TinyLoad's source, all it does is boot the disc, you can get TinyLoad here.