NAME    [Toc]    [Back]

     pciide - PCI IDE controller driver

SYNOPSIS    [Toc]    [Back]

     pciide* at pci ? dev ? function ? flags 0x0000

     option PCIIDE_AMD756_ENABLEDMA
     option PCIIDE_CMD064x_DISABLE
     option PCIIDE_CMD0646U_ENABLEUDMA

     atapiscsi* at pciide? channel ? flags 0x0000
     wd* at pciide? channel ? drive ? flags 0x0000

DESCRIPTION    [Toc]    [Back]

     The pciide driver supports the PCI IDE controllers as specified in the
     "PCI  IDE  controller specification, revision 1.0" draft, as
well as the
     Serial ATA controllers working either in parallel  ATA  compatibility mode
     or  in  native  serial mode.  It provides the core functions
for the wd(4)
     and atapiscsi(4) drivers.  This  driver  includes  specific,
enhanced support
 for the CMD Tech PCI0640 controller and IDE DMA/UltraDMA support for
     the following PCI IDE controllers:

           +o    Acard  ATP850U,   ATP860,   ATP860-A,   ATP865-A,
ATP865-R
           +o   Acer Labs M5229
           +o    Advanced Micro Devices AMD-756, AMD-766, AMD-768,
AMD-8111
           +o    CMD  Tech  PCI0640,  PCI0643,  PCI0646,  PCI0648,
PCI0649, PCI0680
           +o   Contaq Microsystems/Cypress CY82C693
           +o    HighPoint HPT366, HPT370, HPT372, HPT302, HPT371,
HPT374
           +o   Intel PIIX, PIIX3, and PIIX4
           +o                      Intel                     82801
(ICH/ICH0/ICH2/ICH3/ICH4/ICH4-M/ICH5/ICH5R)
           +o   ITE IT8212F
           +o   National Semiconductor PC87415
           +o    National  Semiconductor  SCx200  (found on SC1100
SoC)
           +o   NVIDIA nForce/nForce2 (SATA  controllers  are  not
supported)
           +o    Promise  PDC20246,  PDC20262, PDC20265, PDC20267,
PDC20268,
               PDC20268R, PDC20269, PDC20271, PDC20275, PDC20276,
PDC20277,
               PDC20376
           +o    ServerWorks  OSB4,  CSB5, CSB6 (including support
for the third
               channel)
           +o   Silicon Image SiI3112
           +o   Silicon Integrated System 5513  (5597/5598),  540,
550, 620, 630,
               630S,  633,  635,  640, 645, 645DX, 648, 650, 651,
652, 655, 658,
               730, 733, 735, 740, 745, 746, 748, 750, 751,  752,
755, 962, 963
           +o     VIA   Technologies   VT82C586/A/B,  VT82C596A/B,
VT82C686A/B,
               VT8231, VT8366, VT8233, VT8235, VT8237

     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 explicit
 DMA mode setting support for the controller  but  DMA
is present.
     If  the  BIOS didn't configure the controller properly, this
can cause a
     machine hang.

SEE ALSO    [Toc]    [Back]

     atapiscsi(4), intro(4), pci(4), scsi(4), wd(4), wdc(4)

BUGS    [Toc]    [Back]

     There's no way to know reliably if a CMD064x  controller  is
enabled or
     not.   If  the  driver finds a PCI064x, it will assume it is
enabled unless
     PCIIDE_CMD064x_DISABLE 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 which uses the ISA legacy I/O ports
     and interrupts.

     The CMD0646U is reportedly unable to operate properly in UltraDMA mode.
     UltraDMA will not be enabled on this controller unless
     PCIIDE_CMD0646U_ENABLEUDMA is specified in the kernel config
file.

     For  proper  operation  of  UltraDMA  3  and  higher modes a
40-pin, 80-conductor
 cable must be used.  On  some  controllers,  the  pciide
driver can probe
     the  chip  and  see  if  it  detects that an 80-conductor or
40-conductor cable
     was used.  If not, it will down-grade to  UltraDMA  2  mode.
On other controllers,
  no such capability exists, and the driver assumes
you are using
     an 80-conductor cable.  If you are getting errors about corrupted data,
     check  to  make  sure  you  are using the correct cable.  An
80-conductor cable
 is recommended for any IDE installation, not  just  ones
using faster
     UltraDMA  modes,  because  it will decrease electrical noise
and increase
     data reliability.

     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 necessary
 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.  These timings
will work on a
     slower bus, but they may cause  errors  on  an  over-clocked
bus.

OpenBSD      3.6                         October     15,     1998