Strange Error Message: IPMI_SI during boot up

During the boot up of esx 3.5, I get OK for each system that loads except one:  ipmi_si.

I get the following message:  unable to find any system interface(s).

I am running on a brand new Dell PowerEdge SC1430 with 8Gigs of RAM and RAID-ed 160Gig drives.

Could some one let me know if this is significant and what does it mean?

Thanks.

Wjo