Hi, there is some information in the forum on this topic:
The possibility that AIX uses PS3 was news on PlayStation 3 Dev Forum: PS3's Base AIX, also there are other post that there is some mention: Here and Here.
One PS3 dev doc (old) makes two mentions on AIX, not important, only seems to confirm that AIX is present in some way in ps3:
- PowerPC storage model and AIX programming:What AIX programmers need to know about how their software accesses shared storage: Link
-The following terms are trademarks or registered trademarks of International Business Machines Corporation in the United States and/or other countires: AIX