I do not see 5.5 U2 listed in the hw/sw interoperability matrix.
I have 6248's 2.2 (1d) with B440 m2 & B200 m3. I am assuming I would not be supported at this fw level.
Is a certified fw level coming soon? As well as a "cisco esxi 5.5 u2" .iso build? With fnic and enic drivers....
It looks like there is support and that the drop down matrix at http://www.cisco.com/web/techdoc/ucs/interoperability/matrix/matrix.html is not up-to-date.
Support for 5.5 U2 and drivers here: