[Fedora-xen] More then 16GB with FC6 or FC7?

[thewird]

Is there any way to make the xen kernel see more then
16GB of ram when its installed on a 32bit OS (either
FC6 or FC7)?

I tried FC7 64bit since it can see all the ram,
however the only 32bit OS I was able to install
successfully was windows XP. Every other distro (FC6,
FC7, and CentOS 4.5 & 5.0) would freeze up at some
point in the installation or bootup section.

I have a machine with 28GB of ram and have a month to
get it running.

Marco Jorge