Hmmm, I was asked this question just the other day, with exactly the same words. Wierd Image may be NSFW.
Clik here to view.
OS2BMC is a BMC technology controlled via NC-SI. It runs independently of the OS, by design.
Only a BMC (or whatever is on the other end of the NC-SI link) has control over it. If you want to see what filters get twiddled when a specific NC-SI configuration command is sent, you can use any utility of your choice to look at the CSR's in the I350.
All of the filters (MDEF and MDEF_EXT) are visible, via CSR's and documented within the datasheet.
Hope that helps!
- Patrick
