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, with 0 meaning 8 bits and 1 meaning 16 bits. Defaults to 1 on chips that support wide SCSI, 0 otherwise. Set this to 0 to disable wide transfers even if both controller and de- vice 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. 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), siop(4), sd(4), st(4), cd(4), ch(4), uk(4) NetBSD 1.5.1 January 15, 1997 2
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