MirOS Manual: pciide(4)

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

NAME

     pciide - PCI IDE controller driver

SYNOPSIS

     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

     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:

           •   Acard ATP850U, ATP860, ATP860-A, ATP865-A, ATP865-R
           •   Acer Labs M5229
           •   Advanced Micro Devices AMD-756, AMD-766, AMD-768, AMD-8111
           •   CMD Tech PCI0640, PCI0643, PCI0646, PCI0648, PCI0649, PCI0680
           •   Contaq Microsystems/Cypress CY82C693
           •   HighPoint HPT366, HPT370, HPT372, HPT302, HPT371, HPT374
           •   Intel PIIX, PIIX3, and PIIX4
           •   Intel 82801 (ICH/ICH0/ICH2/ICH3/ICH4/ICH4-M/ICH5/ICH5R)
           •   ITE IT8212F
           •   National Semiconductor PC87415
           •   National Semiconductor SCx200 (found on SC1100 SoC)
           •   NVIDIA nForce/nForce2 (SATA controllers are not supported)
           •   Promise PDC20246, PDC20262, PDC20265, PDC20267, PDC20268,
               PDC20268R, PDC20269, PDC20271, PDC20275, PDC20276, PDC20277,
               PDC20376
           •   ServerWorks OSB4, CSB5, CSB6 (including support for the third
               channel)
           •   Silicon Image SiI3112
           •   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
           •   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 ex-
     plicit 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

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

BUGS

     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 neces-
     sary 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.

MirOS BSD #10-current          October 15, 1998                              1

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