Using yum to upgrade from fc7 to fc8

[Markus Kesaromous]

The yum man page says that if yum is invoked as
yum --obsoletes update
it will upgrade from older distro release to next higher
one (or I assume more recent release). To wit:

update   If run without any packages, update will update every  currently
              installed  package.   If one or more packages are specified, Yum
              will only update the listed packages.  While updating  packages,
              yum  will  ensure  that  all  dependencies are satisfied.  If no
              package matches the given package name(s), they are  assumed  to
              be a shell glob and any matches are then installed.

              If  the  --obsoletes  flag  is  present yum will include package obsoletes in its
              calculations - this makes it  better  for distro version  changes,  for example:
              upgrading from somelinux 8.0  to somelinux 9.

However, when I invoke it, it says: 

# yum --obsoletes update
atrpms                    100% |=========================|  951 B    00:00     
fedora                    100% |=========================| 2.1 kB    00:00     
primary.sqlite.bz2        100% |=========================| 4.7 MB    00:27     
dries                    100% |=========================|  951 B    00:00     
updates                   100% |=========================| 2.3 kB    00:00     
skype                     100% |=========================|  951 B    00:00     
adobe-linux-i386          100% |=========================|  951 B    00:00     
Setting up Update Process
No Packages marked for Update


Is this caused by using  repositories in addition to "fedora" and "updates" ?






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