Hi, nice to hear it boots :)
I believe you have git installed, and downloaded tree with git clone command. So in directory src/mainboard/jetway/j7bxan run: "git add ." this will start tracking j7bxan dir files. Use git add to any other files if you have created them.
then in the root coreboot directory: "git add -u" this will add file modifications you have done to tree
also in root: "git diff --find-copies-harder --cached > j7bxan.diff" this will prepare an initial patch.
Thanks, Tadas