pciide(4) - NetBSD Manual Pages

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PCIIDE(4)                 NetBSD Programmer's Manual                 PCIIDE(4)


NAME

     pciide - PCI IDE disk controllers driver


SYNOPSIS

     pciide* at pci? dev ? function ? flags 0x0000
     pciide* at pnpbios? index ?
     options PCIIDE_CMD064x_DISABLE
     options PCIIDE_AMD756_ENABLEDMA
     options PCIIDE_CMD0646U_ENABLEUDMA


DESCRIPTION

     The pciide driver supports the PCI IDE controllers as specified in the
     "PCI IDE controller specification, revision 1.0" draft, and provides the
     core functions for the wd and atapi drivers. This driver include specif-
     ic, enhanced support for the CMD Tech PCI0640 controller, and IDE DMA/Ul-
     tra-DMA support for the following controllers:
           -   Acard ATP850 (Ultra/33) and ATP860 (Ultra/66) IDE Controllers
           -   Acer labs M5229 IDE Controller
           -   Advanced Micro Devices AMD-756, 766 and 768 IDE Controllers
           -   CMD Tech PCI0643, PCI0646, PCI0648 and PCI0649 IDE Controllers
           -   Contaq Microsystems/Cypress CY82C693 IDE Controller
           -   HighPoint HPT366 Ultra/66 and HPT370 Ultra/100 IDE controller
           -   Intel PIIX, PIIX3 and PIIX4 IDE Controllers
           -   Intel 82801 (ICH/ICH0/ICH2/ICH4) IDE Controllers
           -   OPTi 82c621 (plus a few of its derivatives) IDE Controllers
           -   Promise PDC20246 (Ultra/33), PDC20262 (Ultra/66),
               PDC20265/PDC20267 (Ultra100), PDC20268 (Ultra/100TX2 and Ul-
               tra/100TX2v2) and Ultra/133 PCI IDE controllers
           -   Silicon Integrated System 5597/5598 IDE controller
           -   VIA Technologies VT82C586, VT82C586A, VT82C596A, VT82C686A and
               VT8233A IDE Controllers
     Some of these controllers are only available in multifunction PCI chips.

     The 0x0001 flag forces the pciide driver to use DMA when there is no ex-
     plicit DMA mode setting support for the controller but DMA is present. If
     the BIOS didn't set up the controller properly, this can cause a machine
     hang.

     The 0x0002 flag forces the pciide 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

     intro(4), pci(4), pnpbios(4), scsi(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 disabled 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 AMD756 chip revision D2 has a bug affecting DMA (but not Ultra-DMA)
     modes.  The workaround documented by AMD is to not use DMA on any drive
     which does not support Ultra-DMA modes.  This does not appear to be nec-
     essary on all drives, the PCIIDE_AMD756_ENABLEDMA option can be used to
     force multiword DMA on the buggy revisions.  Multiword DMA can eventually
     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 (except the OPTi controller,
     which supports both 25 and 33 MHz PCI bus timings). This driver may not
     work properly on overclocked systems.

     The core wdc doesn't support modes higher than Ultra-DMA 5, so the
     Promise Ultra/133 is only used at Ultra/100.

NetBSD 1.6                     October 15, 1998                              2