Here's the latest version of this patch. Changes since the last version I posted: fix to actually use the legacy interface for ATAPI as was intended, set the proper sg_tablesize for legacy and ADMA mode, some message and formatting cleanups, and ADMA is now enabled by default.

This patch is against 2.6.19-rc2.

As before, testing by people with this hardware would be appreciated. Also, it would be nice to get this into libata-dev or -mm to get some more exposure..

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This patch adds support for ADMA mode on NVIDIA nForce4 (CK804/MCP04) SATA controllers to the sata_nv driver. Benefits of ADMA mode include:

-NCQ support
-Reduced CPU overhead (controller DMAs command information from memory instead of them being pushed in by the CPU)
-Full 64-bit DMA support

ADMA mode is enabled by default in this version. To disable it, set the module parameter adma_enabled=0.

Signed-off-by: Robert Hancock <hancockr@shaw.ca>

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Robert Hancock      Saskatoon, SK, Canada
To email, remove "nospam" from hancockr@nospamshaw.ca
Home Page: http://www.roberthancock.com/