The GATOS project
has long been known as the path to take for enabling TV output support with the open-source X.Org driver on the Radeon 8500 to 9250 (R200) series, but soon you may no longer need to worry about the GATOS patch. Hanno has announced on the project mailing list
that all of those involved with the GATOS project have agreed to move away from the GPL in favor of the MIT/X11 license. This relicensing makes it possible for the GATOS code to be merged with the X.Org Radeon R200 driver.
Before the GATOS code can be merged with the R200 driver there are still a few needed patches so it can build against the latest driver git code. The Radeon developers will still need to review and comment on this code. GATOS won't be merged with the X.Org R200 driver immediately, but in the near future this code will hopefully be merged, which then will allow basic TV-Out support "out of the box" using the open-source Radeon driver. This code does not support any other ATI/AMD GPUs aside from the R200 family.