nullDC-Naomi SVN r74 is released. nullDC-Naomi is an open source NAOMI Arcade System Emulator. It will NOT run Dreamcast games.

nullDC-Naomi SVN Changelog:
r74
Imgreader:
--ioctl code, now should be able to read directly from discs. This hasn't been
tested as i don't have a cd/dvd drive around ...

Download: nullDC-Naomi SVN r74
Source:Here