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More interesting is it is running FreeBSD: http://www.scei.co.jp/ps4-license/

That would be on the devkit most likely.

ps3, ps4 and ps vita run freebsd

PS3 for sure does not run FreeBSD. It does use a modified version of UFS. The lv1 hypervisor is likely derived from IBM's reference implementation. I'm not sure about the lv2 OS (GameOS) but I believe it is 100% Sony code.

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