Today, 2013-01-24, we released fmc-bus-v2013-01.

This supports multi-mezzanine carriers, like the svec, and it is being
used successfully with two fine-delay mezzanines, as well as on the spec
with a single mezzanine.

Besides, it supports IPMI identifiers (reading and writing them), and
creation of an SDBFS instance in the mezzanine’s eeprom.
For more information please get the official manual:
https://www.ohwr.org/project/fmc-bus/uploads/89b3f3ebd02c9db35de991d1cf918865/fmc-bus-2013-01-release.pdf