I too have a Supermicro board with LSI SAS 2008. I followed the instructions for an upgrade to -STABLE, despite being new to FreeBSD. The upgrade turned out fine, but the mps driver is not working.
On IRC, someone told me the reason that the card isn't detected is because vendor and manufacturing id's are set to 0xffff in /usr/src/sys/dev/mps/mps_pci.c.
On IRC, someone told me the reason that the card isn't detected is because vendor and manufacturing id's are set to 0xffff in /usr/src/sys/dev/mps/mps_pci.c.