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Some variation of Linux is the de facto standard for Raspberry Pi. However, smaller, lesser known operating systems do exist and some would seem appropriate for such a small device.

Are any other operating systems compatible with Raspberry Pi or are there any other OS dev teams working to port their code to RP?

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I'd be really interested if it would be possible to get MicroC/OS-II working, for some embedded real-time systems work. – Breakthrough Aug 8 '12 at 15:29

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RISCOS is in the works and there is QT available now. Some bare metal programmers are working on OS's from scratch as well but these are more for fun & research than full blown OS's.

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Bare metal OS sounds like fun. Care to share links? – Damian Powell Jun 12 '12 at 22:20
@Nick McCloud: Provide a few additional links, and you have the answer mark! – RLH Jun 13 '12 at 18:14
up vote 3 down vote

As mentioned earlier, RISCOS is probably in the most advanced state right now. You can also read about making FreeBSD work on RPi here. Some people are working on their own bare metal OSes but they are mostly a hobby projects, here is an example. There are some technical problems with getting different OSes on Rpi, mostly because of the lack of publicly available documentation to some peripherals, especially USB (which is known to have a lot of problems even on Linux).

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Haiku, an OS whose design was inspired by BeOS, has an extremely early port available for the Pi. Read here for more details.

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up vote 2 down vote

NetBSD is in work (booting, not more); FreeBSD also (only the boot loader).

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Hello me myself! Welcome to Raspberry Pi. Could you please add some citations to your answer? Thanks! – Bryan Dunsmore♦ Aug 8 '12 at 15:45
For NetBSD, see mail-index.netbsd.org/port-arm/2012/07/13/msg001367.html – nos Sep 29 '12 at 13:55

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up vote 1 down vote

There is also version 4 of Android being developed and Aros a remake of the Amiga Operating System.

http://androidpi.wikia.com/wiki/Android_Pi_Wiki

http://www.aros-broadway.de/downloads/index.html

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up vote 1 down vote

There is also a port of Firefox OS.

It was reported on the official raspberry site too http://www.raspberrypi.org/archives/1787

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