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I'm not aware of any proprietary protocols.
Regarding CSMI, I tested only CSMI_SAS_GET_DRIVER_INFO, CSMI_SAS_GET_PHY_INFO, CSMI_SAS_STP_PASSTHRU.
The pass-through functionality in recent RST driver versions has issues:
RST 10.*: System stuck during ATA commands with longer duration (not uncommon for SMART commands),
RST 11.0.*, 11.2.*: pass-through does not work (this may also break some functionality of Intel SSD Toolbox),
RST 11.5.* beta: pass-through works again (see http://communities.intel.com/thread/29832).
Thanks for the promptly answer!
And about a proprietary API/protocol, anybody knows?