Custom resolution in Fedora 11

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http://unix.stackexchange.com – I am currently building a custom embedded project for which I need to display Fedora 11 on a small screen 800*480 pixels. Can anyone one suggest to me a way of doing it. As I am a complete noob I tried to change the .conf file of xorg server but it is of no help. Also it is not updating. Also can anyone tell how to update the packages as currently package updating is not working. (HowTos)