Greetings.
The only officially supported PCI cards are listed in the spec sheet at http://www.cisco.com/c/dam/en/us/products/collateral/servers-unified-computing/ucs-c-series-rack-servers/c220m3-sff-specsheet.pdf
which does not include the 9212 card.
The M4 servers do have some tested cards with external connections for external storage, but not the M3s.
You would need to manage/configure the 9212 firmware with LSI/Broadcom provided utilities, as the C220M3 HUU/firmware ISO won't contain firmware for unsupported cards, and I wouldn't expect the CIMC to provide much information for cards not tested with it.
If you enable the option ROM for the PCI slot (#2 it sounds like), the 9212 option ROM should load, and hopefully give you a utility (i.e. WebBios) that will allow you to check for attached storage/drives, and create supported raid volumes.
Thanks,
Kirk...