Upload a ppc, s3390, or s390x package to the Taroon beta channels. Log in as the admin on the RHN website, go to "Software" -> "Manage Packages". Look for the package you justt uploaded, it will be there but won't show (on the initial screen) that the package is in a channel. If you click on the package name it reveals that the package is in a channel.
this was weirdly aligned to a 410 bug/feature. moving to rhn-uncommitted but feel free to re-align if necessary
I'm closing this, it's old old old.