The arcmsr driver is in-kernel but you can't install to a
system using it for the main disk controller:
https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=249647
Ditto for the uli526x network driver, network installs are
impossible on systems using that:
https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=246165
The kernel has the drivers available, but people are reporting
these as kernel bugs...