A Battlefield 2 Update announces the release of the Linux dedicated server for the Battlefield 2 demo. The 40 MB download is available on EA's FTP server (direct link), and mirrored on 3D Downloads, 3D Gamers, and FileFront. There is also an update confirming that they are intentionally removing servers from their server list that have turned off the game's time limit:

EA and DICE both fully support server-side modding in the sense that we have intentionally exposed a good deal of Python functionality to the end-user, primarily to encourage modders to tweak game types and scoring (on UNRANKED servers) once the full game is available. That said, we have come to discover that two items that were not a part of the demo feature-set were hacked in the Battlefield 2 demo. We consider both of these changes in violation of the Tools EULA that each server operator accepted in installing the server software.

The demo's feature set included a 12-minute time limit on rounds and excluded access to the weapon unlocks. Because some server operators have hacked the time limit out of their servers or hacked access to the unlocks, we have been forced to reinforce our intended feature set by delisting the offending servers. All violations of the EULA as described above will result in a 1-week ban/delisting.