Upgrade directions are not really OS specific, as upgrading really is simply copying the files over your old files and running the upgrade script. That being said there are steps that should be taken prior to doing this. (such as backing up your database, etc)
While this isn't really for 1.6 to 1.7, the basics still apply:
http://www.tmib.net/how-upgrade-osticket-17rc6-17st(http://www.tmib.net/how-upgrade-osticket-17rc6-17st)