ncr(4) - NetBSD Manual Pages

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NCR(4)                    NetBSD Programmer's Manual                    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 con-
     troller 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, syn-
     chronous 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 de-
     fault, 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 us-
     ing 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.  En-
     able 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)

NetBSD 1.4                     January 15, 1997                              2