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NetBSD 6.1.5 - man page for viaide (netbsd section 4)

VIAIDE(4)			   BSD Kernel Interfaces Manual 			VIAIDE(4)

     viaide -- AMD, NVIDIA and VIA IDE disk controllers driver

     viaide* at pci? dev ? function ? flags 0x0000
     options PCIIDE_AMD756_ENABLEDMA

     The viaide driver supports the following IDE controllers and provides the interface with the
     hardware for the ata driver:
	   -   Advanced Micro Devices AMD-756, 766, 768 and CS5536 IDE Controllers
	   -   NVIDIA nForce, nForce2, nForce2 400, nForce3, nForce3 250, nForce4, MCP04, MCP55,
	       MCP61, MCP65, MCP67 IDE and SATA Controllers.
	   -   VIA Technologies VT82C586, VT82C586A, VT82C596A, VT82C686A, VT8233A, VT8235,
	       VT8237/VT8237R IDE Controllers, VT6421 Serial RAID Controller and CX700 IDE Con-

     The 0x0002 flag forces the viaide driver to disable DMA on chipsets for which DMA would nor-
     mally be enabled.	This can be used as a debugging aid, or to work around problems where the
     IDE controller is wired up to the system incorrectly.

     ata(4), atapi(4), intro(4), pci(4), pciide(4), wd(4), wdc(4)

     Drives on the VT6421 Serial RAID Controller can only be accessed after they have been con-
     figured into RAID or JBOD sets via its BIOS.  It is also inaptly named as it has both SATA
     and PATA interfaces.

     The AMD756 chip revision D2 has a bug affecting DMA (but not Ultra-DMA) modes.  The work-
     around documented by AMD is to not use DMA on any drive which does not support Ultra-DMA
     modes.  This does not appear to be necessary on all drives, the PCIIDE_AMD756_ENABLEDMA
     option can be used to force multiword DMA on the buggy revisions.	Multiword DMA can eventu-
     ally be disabled on a per-drive basis with config flags, see wd(4).  The bug, if triggered,
     will cause a total system hang.

     The timings used for the PIO and DMA modes for controllers listed above are for a PCI bus
     running at 30 or 33 MHz.  This driver may not work properly on overclocked systems.

BSD					 August 31, 2007				      BSD

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