vxworks programmer's guide.pdf - DAQ Plone Site

VxWorks 5.4
Programmer’s Guide
Table 3-13
SCSI Constants
Constant Description Where to Configure
INCLUDE_SCSI_DMA Enable DMA for SCSI. sysLib.c or sysScsi.c
INCLUDE_SCSI_BOOT Allow booting from a SCSI device. sysLib.c or sysScsi.c
SCSI_AUTO_CONFIG
Auto-configure and locate all
targets on a SCSI bus.
sysLib.c or sysScsi.c
INCLUDE_DOSFS Include the DOS file system. operating system
components/IO system
components
INCLUDE_TAPEFS Include the tape file system. config.h
INCLUDE_CDROMFS
Include CD-ROM file system
support.
config.h
Autoconfiguration, DMA, and booting from a SCSI device are defined
appropriately for each BSP. If you need to change these settings, see the online
reference for sysScsiConfig( ) under VxWorks Reference>Manual: Libraries and the
source file installDir/target/src/config/usrScsi.c. Except for dosFs, which can be
configured from the project facility, the file systems that can be used with SCSI
must be defined in config.h. (For more information see 8. Configuration and Build.)
! CAUTION: Including SCSI-2 in your VxWorks image can significantly increase the
image size. If you receive a warning from vxsize when building VxWorks, or if the
size of your image becomes greater than that supported by the current setting of
RAM_HIGH_ADRS, be sure to see 8.6.1 Scaling Down VxWorks, p.344 and
8.9 Creating Bootable Applications, p.364 for information on how to resolve the
problem.
Configuring the SCSI Bus ID
Each board in a SCSI-2 environment must define a unique SCSI bus ID for the SCSI
initiator. SCSI-1 drivers, which support only a single initiator at a time, assume an
initiator SCSI bus ID of 7. However, SCSI-2 supports multiple initiators, up to eight
initiators and targets at one time. Therefore, to ensure a unique ID, choose a value
in the range 0-7 to be passed as a parameter to the driver’s initialization routine
(for example, ncr710CtrlInitScsi2( )) by the sysScsiInit( )routine in sysScsi.c. For
more information, see the reference entry for the relevant driver initialization
routine. If there are multiple boards on one SCSI bus, and all of these boards use
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