PCIIDE(4) BSD Programmer's Manual PCIIDE(4)
pciide - PCI IDE controller driver
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
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.
atapiscsi(4), intro(4), pci(4), scsi(4), wd(4), wdc(4)
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.
MirBSD #10-current October 15, 1998 1