test

Writing Device Drivers

Global Data Definitions

The following is information for debugging, useful when a driver experiences bus-wide problems. One global data variable has been defined for the SCSA implementation: scsi_options. This variable is a SCSA configuration longword used for debug and control. The defined bits in the scsi_options longword can be found in the file <sys/scsi/conf/autoconf.h>. Table G-2 shows their meanings when set.

Table G-2 SCSA Options

Option 

Description 

SCSI_OPTIONS_DR

Enables global disconnect/reconnect. 

SCSI_OPTIONS_SYNC

Enables global synchronous transfer capability. 

SCSI_OPTIONS_LINK

Enables global link support. 

SCSI_OPTIONS_PARITY

Enables global parity support. 

SCSI_OPTIONS_TAG

Enables global tagged queuing support. 

SCSI_OPTIONS_FAST

Enables global FAST SCSI support: 10MB/sec transfers, as opposed to 5 MB/sec. 

SCSI_OPTIONS_FAST20

Enables global FAST20 SCSI support: 20MB/sec transfers. 

SCSI_OPTIONS_FAST40

Enables global FAST40 SCSI support: 40MB/sec transfers. 

SCSI_OPTIONS_FAST80

Enables global FAST80 SCSI support: 80MB/sec transfers. 

SCSI_OPTIONS_WIDE

Enables global WIDE SCSI. 

Note -

The setting of scsi_options affects all host adapter and target drivers present on the system (as opposed to scsi_ifsetcap(9F)). Refer to scsi_hba_attach(9F) in the Solaris 2.6 Reference Manual for information on controlling these options for a particular host adapter.

The default setting for scsi_options has these values set: