disable OHCI?

[SimpleSymon]

I've seen mention that the OCHI mapping between FireWire and device memory is some sort of security concern, and should be disabled. My question is twofold. Firstly, how to disable OCHI mapping; secondly, is there downside to doing this?

 

[S0ULphIRE]

From wikipedia

When applied to a FireWire card, OHCI means that the card supports a standard interface to the PC and can be used by the OHCI FireWire drivers that come with all modern operating systems. Because the card has a standard OHCI interface, the OS does not need to know in advance exactly who makes the card or how it works; it can safely assume that the card understands the set of well-defined commands that are defined in the standard protocol.

Now you know what it actually does, you can make a better decision. Yes there's a downside to disabling it, as mentioned in the last sentence of the quote above. As to exactly how you do it, I'm not sure.