pciide(4) - NetBSD Manual Pages

Command: Section: Arch: Collection:  
PCIIDE(4)                 NetBSD Programmer's Manual                 PCIIDE(4)

pciide - PCI IDE disk controllers driver
pciide* at pci? dev ? function ? flags 0x0000 pciide* at pnpbios? index ? options PCIIDE_CMD064x_DISABLE options PCIIDE_AMD756_ENABLEDMA options PCIIDE_CMD0646U_ENABLEUDMA
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, HPT370 Ultra/100, HPT372, and HPT374 Ultra/133 IDE controller - Intel PIIX, PIIX3, and PIIX4 IDE Controllers - Intel 82801 (ICH/ICH0/ICH2/ICH3/ICH4/ICH5) 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), Ultra/133, Ultra/133TX2 and Ultra/133TX2v2 PCI IDE controllers - Silicon Integrated System 5597/5598 IDE controller - VIA Technologies VT82C586, VT82C586A, VT82C596A, VT82C686A, VT8233A, and VT8235 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 ma- chine 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.
intro(4), pci(4), pnpbios(4), scsi(4), wd(4), wdc(4)
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. NetBSD 1.6.2 October 7, 2002 2
Powered by man-cgi (2024-03-20). Maintained for NetBSD by Kimmo Suominen. Based on man-cgi by Panagiotis Christias.