PIIX_SET_DMAMODE(9) ata_piix Internals PIIX_SET_DMAMODE(9)NAME
piix_set_dmamode - Initialize host controller PATA DMA timings
void piix_set_dmamode(struct ata_port * ap, struct ata_device * adev);
Port whose timings we are configuring
Set MW/UDMA mode for device, in host controller PCI config space.
None (inherited from caller).
COPYRIGHT Kernel Hackers Manual 3.10 June 2014 PIIX_SET_DMAMODE(9)
Check Out this Related Man Page
CMDIDE(4) BSD Kernel Interfaces Manual CMDIDE(4)NAME
cmdide -- CMD Technology and Silicon Image IDE disk controllers driver
cmdide* at pci? dev ? function ? flags 0x0000
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
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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