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[ lack of SATA NCQ support for nforce4-ultra ]

Adrian writes:
> http://git.kernel.org/?p=linux/kernel/git/torvalds/linux.git;a=commitdiff;h=e2e031eb09760c36099ac127eeb175e06d257aef

which is:

The mcp61 has bug with ncq.
- { PCI_VDEVICE(NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_MCP61_SATA), SWNCQ },
- { PCI_VDEVICE(NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_MCP61_SATA2), SWNCQ },
- { PCI_VDEVICE(NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_MCP61_SATA3), SWNCQ },
+ { PCI_VDEVICE(NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_MCP61_SATA), GENERIC },
+ { PCI_VDEVICE(NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_MCP61_SATA2), GENERIC },
+ { PCI_VDEVICE(NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_MCP61_SATA3), GENERIC },

http://en.wikipedia.org/wiki/GeForce_6_Series
says: "MCP61 introduced a bug in the SATA NCQ implementation.
As a result, Nvidia employees have contributed code to disable NCQ operations under Linux."
I have not found a description of the bug.

But FreeBSD says I have:

<nVidia nForce CK804 SATA300 controller> port 0x9f0-0x9f7,0xbf0-0xbf3,0x970-0x977,0xb70-0xb73,0xcc00-0xcc0f
 mem 0xfebfb000-0xfebfbfff irq 21 at device 7.0 on pci0
<nVidia nForce CK804 SATA300 controller> port 0x9e0-0x9e7,0xbe0-0xbe3,0x960-0x967,0xb60-0xb63,0xb800-0xb80f
 mem 0xfebfa000-0xfebfafff irq 22 at device 8.0 on pci0

The CK804 (a few lines higher in the source file) did not get changed to GENERIC.
As far as I can figure out, the bug (whatever it is) is limited to the MCP61.