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

NAME
     pciide - PCI IDE controller driver

SYNOPSIS
     pciide* at pci? flags 0x0000
     pciide* at jmb? flags 0x0000

     option PCIIDE_AMD756_ENABLEDMA
     option PCIIDE_CMD064x_DISABLE
     option PCIIDE_CMD0646U_ENABLEUDMA

     atapiscsi* at pciide? flags 0x0000
     wd* at pciide? 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 sup-
     port 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   Adaptec AAR-1210SA
           o   AMD 756, 766, 768, 8111, Hudson 2
           o   ATI SB200, SB300, SB400, SB600, SB700 (IDE only)
           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/
               ICH6/ICH6M/ICH6R/ICH7/ICH7M/ICH7R/ICH7M DH/ICH8/ICH8M/
               ICH9/ICH9M)
           o   Intel 6300ESB/6321ESB
           o   ITE IT8211F, IT8212F
           o   JMicron JMB361/3/5/6/8
           o   National Semiconductor PC87415
           o   National Semiconductor SCx200 (found on SC1100 SoC)
           o   NVIDIA nForce/nForce2/nForce2-400/nForce3/nForce3-250/nForce4,
               MCP04/MCP51/MCP55/MCP61/MCP65/MCP67/MCP73/MCP77
           o   Promise PDC20246, PDC20262, PDC20265, PDC20267, PDC20268,
               PDC20268R, PDC20269, PDC20271, PDC20275, PDC20276, PDC20277,
               PDC20318, PDC20319, PDC20371, PDC20375, PDC20376, PDC20377,
               PDC20378, PDC20379, PDC20571, PDC20575, PDC20579, PDC20771,
               PDC20775, PDC40518, PDC40519, PDC40718, PDC40719, PDC40779
           o   Phison PS5000
           o   ServerWorks SATA, OSB4, CSB5, CSB6 (including support for the
               third channel)
           o   Silicon Image SiI3112, SiI3512, SiI3114
           o   Silicon Integrated System 180, 181, 5513 (5597/5598), 540, 550,
               620, 630, 630S, 633, 635, 640, 645, 645DX, 648, 650, 651, 652,
               655, 658, 661, 730, 733, 735, 740, 745, 746, 748, 750, 751,
               752, 755, 760, 962, 963
           o   VIA Technologies CX700, VT82C586/A/B, VT82C596A/B, VT82C686A/B,
               VT8231, VT8366, VT8233, VT8235, VT8237, VT8237A/S, VT8251,
               VT6410, VX700, VX855

     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), jmb(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 an-
     other 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-conduc-
     tor 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 con-
     trollers, 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 ca-
     ble 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 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.  These timings will work on a
     slower bus, but they may cause errors on an over-clocked bus.

OpenBSD 4.7                    November 12, 2009                             2
