NCR(4)

NAME
ncr - NCR 53C8xx SCSI driver

SYNOPSIS
ncr* at pci? dev ? function ?
scsibus* at ncr?

options FAILSAFE
options NCR_CDROM_ASYNC
options NCR_IOMAPPED
options NCR_TEKRAM_EEPROM
options SCSI_NCR_DFLT_TAGS=integer
options SCSI_NCR_MAX_SYNC=integer
options SCSI_NCR_MAX_WIDE=integer
options SCSI_NCR_SYMBIOS_COMPAT
options SCSI_NCR_TRUST_BIOS

DESCRIPTION
The ncr driver provides support for the NCR (Symbios) 53C810, 53C815, 53C820, 53C825, 53C860, 53C875, 53C885, 53C895, and 53C896 SCSI controller chips.

The following kernel configuration options are available:

options FAILSAFE
Disables tagged command queuing and forces asynchronous transfers for CD-ROM devices.

options NCR_CDROM_ASYNC
Always use asynchronous transfers with CD-ROM devices. By default, synchronous transfers are used if the CD-ROM supports it.

options NCR_IOMAPPED
Attempt to access the controller chip via I/O port-mapped I/O, falling back to memory-mapped I/O if the I/O ports couldn't be mapped. By default, memory-mapped I/O is tried first.

options NCR_TEKRAM_EEPROM
Enables support for reading the configuration EEPROM of the Tekram DC-390 series of SCSI cards. Enable this only if using a Tekram DC-390 card.

options SCSI_NCR_DFLT_TAGS=integer
Specifies the maximum number of tags per logical unit. Unless FAILSAFE is defined, the default value is 4. A value of 0 will disable tagged command queuing.

options SCSI_NCR_MAX_SYNC=integer
Specifies the maximum synchronous transfer frequency to use, in kHz. A value of 0 means asynchronous transfers only. The default is 20000 (20MHz), unless the controller chip only supports fast transfers, in which case it's 10000 (10MHz).

options SCSI_NCR_MAX_WIDE=integer
Specifies the maximum SCSI bus width, in bytes. Defaults to 1 on chips that support wide SCSI, 0 otherwise. Set this to 0 to disable wide transfers even if both controller and device support them (e.g. when using a wide controller and wide drive through a narrow cable).

options SCSI_NCR_SYMBIOS_COMPAT
Enables the use of the GPIO register as a disk activity indicator. Enable this if the activity LED isn't working, but make sure the card doesn't use GPIO for something else. Cards known to support this: ASUS SC875, Diamond FirePort 40, and Symbios SYM8751S.

options SCSI_NCR_TRUST_BIOS
Specifies that the driver should use the register configuration set by the firmware instead of configuring the chip itself.

SEE ALSO
intro(4), scsi(4), sd(4), st(4), cd(4), ch(4), uk(4)