On 08/04/2009 08:35 PM, Philip Langdale wrote:

On Wed,  5 Aug 2009 00:32:34 +0100 (BST)
Tony Vroon[off-list ref]  wrote:

quoted

The nVidia MCP55 controller quite happily supports MSI.
This adds an option to use it. It is disabled by default and
will only be honoured on MCP5x series controllers.
This was suggested in 2007 back when the driver was less mature,
perhaps now is a better time for it.

I don't use an MCP55 motherboard anymore but I ran with MSI on for
multiple years to no ill effect. However, in this thread where I
reported my success, another person reported failure with MCP51.

http://www.nvnews.net/vbulletin/showthread.php?t=101144&highlight=sata_nv+msi

Assuming that's true, you can't use the 'MCP5x' test as that will
cover MCP51 as well.

I'd take that with a bit of a grain of salt as there have been a lot of 
HT MSI fixups included since those posts (2007). Some motherboards 
didn't enable HT MSI mapping capabilities by default, which would 
prevent MSI from working.