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LEARN ABOUT NETBSD

cmdide

CMDIDE(4)						   BSD Kernel Interfaces Manual 						 CMDIDE(4)

NAME

     cmdide -- CMD Technology and Silicon Image IDE disk controllers driver

SYNOPSIS

     cmdide* at pci? dev ? function ? flags 0x0000
     options PCIIDE_CMD064x_DISABLE
     options PCIIDE_CMD0646U_ENABLEUDMA

DESCRIPTION

     The cmdide driver supports the CMD Technology PCI0640, PCI0643, PCI0646, PCI0648, PCI0649, and Silicon Image 0680 IDE controllers, and pro-
     vides the interface with the hardware for the ata(4) driver.

     The 0x0002 flag forces the cmdide driver to disable DMA on chipsets for which DMA would normally 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.

SEE ALSO

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

BUGS

     There's no way to reliably know if a PCI064x controller is enabled or not.  If the driver finds a PCI064x, it will assume it is enabled
     unless the PCIIDE_CMD064x_DISABLE option is specified in the kernel config file.  This will be a problem only if the controller has been dis-
     abled in the BIOS and another controller has been installed and uses the ISA legacy I/O ports and interrupts.

     The PCI0646U controller is known to be buggy with Ultra-DMA transfers, so Ultra-DMA is disabled by default for this controller.  To enable
     Ultra-DMA, use the PCIIDE_CMD0646U_ENABLEUDMA option.  Ultra-DMA can eventually be disabled on a per-drive basis with config flags, see
     wd(4).

     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
								 December 13, 2003							       BSD

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