The BusLogic SCSI host adapter driver enables SDI-compliant target drivers (such as sd01 and st01) to communicate on the SCSI bus with target controllers and logical units. This allows normal access to mass-storage devices using standard system interfaces and filesystems.
You can access the SCSI bus subsystem directly by using the driver's pass-through interface. This allows the user to issue sb control blocks directly to a SCSI target device. To find the appropriate pass-through device to use for a particular target device, the user should open(2) the character special file for the device in question and then issue the B_GETDEV ioctl. The device value returned should then be used to create a character special file which, when opened, may be used for pass-through (SDI_SEND ioctl).
BusLogic SCSI adapters support the Tag Command Queueing feature as default. To disable this feature, change the value of the blc_do_tag variable in the /etc/conf/pack.d/blc/space.c file from 1 to 0. After you have changed the value in the file, rebuild the kernel for the Tag Command Queueing feature to be effective.