Gonzo from kernelnomicon.org and others have been working to get FreeBSD run on the Raspberry Pie, but having all driver details will make their work considerably easier. It will take away a lot of guess work and reverse engineering.
The move means every driver that interacts with the board’s ARM CPU is now open source. This will make it easier to port new operating systems to the device — which already runs a range of Linux distributions, including Debian and Arch Linux. It has been welcomed by groups working to port the Risc OS, FreeBSD and Plan9 — the Bell Labs OS named after the movie Plan 9 from Outer Space — to the device.