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Caution: This version of this document is no longer maintained. For the latest documentation, see http://www.qnx.com/developers/docs.


Driver for Adaptec 154x and compatible SCSI host adapters (QNX Neutrino)

Note: You must be root to start this driver.


devb-aha4 [cam option[,option]...]
          [cdrom option[,option]...] 
          [disk option[,option]...] 
          [optical option[,option]...] 
          [aha4 option[,option]...] 
          [blk option[,option]...]  &


Note: Use commas (,) to separate the options. You can put the cam, cdrom, disk, optical, aha4, and blk groups of options in any order.

cam options

Enable Logical Unit Number (LUN) scan for the devices specified in mask. The mask is a hex bitmask specifying which IDs to scan for; the default is 0x00.
Be quiet: don't display any information on startup.
Be verbose: display full information about SCSI units (devices) on startup.

cdrom options

The cdrom options control the driver's interface to cam-cdrom.so. If specified, they must follow the cdrom keyword.

disk options

The disk options control the driver's interface to cam-disk.so. If specified, they must follow the disk keyword.

optical options

The optical options control the driver's interface to cam-optical.so. If specified, they must follow the optical keyword.

aha4 options

The aha4 options control the drivers interface to the AHA 4 series controllers. If you've installed multiple controllers, you can repeat these options for each controller. Remember, however, to specify the aha4 keyword before each controller's set of options.

The I/O port of the interface. By default, it's detected automatically.
Use this for Adaptec clones; the default is for the driver to attempt to verify the type of card, and clone disables this check.
Use the specified DMA channel.
Assume that the controller is using this interrupt. Default is 11.
Don't reset the controller and SCSI bus at initialization time.
Specify the SCSI ID used by the controller. Default is 7.

blk options

The blk options control io-blk.so. If specified, they must follow the blk keyword.


The devb-aha4 driver is for the Adaptec AIC-154x and compatible SCSI controllers.

Controllers supported by this driver include, but aren't necessarily limited to:

Manufacturer Controller
Adaptec AHA-1540A
Adaptec AHA-1542A

The driver performs a scan, looking for installed units. All targets are scanned (0 to 7) and for each target, each LUN (Logical Unit Number) is scanned (0 to 7). Devices are numbered starting from 0, and each type of device is numbered separately.

The devb-aha4 driver closes its standard input, standard output and standard error immediately after completing its initializations. Error messages may be produced during the initialization phase and are written to standard error.


Start the Adaptec 4 driver:

devb-aha4 &

Start the Adaptec 4 driver, specifying an I/O port of 0x330 and an interrupt of 11:

devb-aha4 aha4 ioport=0x330,irq=11 &


The devb-aha4 driver causes io-blk.so to adopt various block special devices under /dev. These devices are normally named hdn (or cdn for CD-ROMs), where n is the physical unit number of the device.

This driver could also require the following shared objects:

Binary Required
cam-cdrom.so For CD-ROM access.
cam-disk.so For hard-disk access.
libcam.so Always

Exit status:

The devb-aha4 driver terminates only if an error occurs during startup, or if it has successfully forked itself upon startup because it hadn't been initially started in the background.

The devb-aha4 driver wasn't started in the background and therefore forked itself. The original process terminated with a zero exit status, the forked process continued.
> 0
An error occurred during startup.


Unless overridden with the blk automount= option (see io-blk.so), devices are mounted as:

Device Mountpoint Filesystem type
/dev/hd0t77 /hd qnx4
/dev/cd0 /cd cd
/dev/hd0t6 /dos dos
/dev/hd0t11 /dos dos

While there's no limit to the size of a disk or partition, I/O (i.e. the lseek(), read() and write() functions) is currently limited to 2 gigabytes per partition (or disk). This I/O limit has no effect on the partition size for mounted filesystems.

Known supported functions include:

chmod(), chown(), close(), closedir(), creat(), devctl(), dup(), dup2(), fcntl(), fpathconf(), fstat(), lseek(), mkdir(), mkfifo(), mknod(), open(), opendir(), pathconf(), read(), readdir(), readlink(), rewinddir(), rmdir(), stat(), symlink(), unlink() (not supported for directories), utime(), write()

Note that certain calls (such as pipe(), as well as read() and write() on FIFOs) may require the pipe manager.

See also:


"Block-oriented drivers (devb-*)," "Common access method (cam-*)," and "Filesystem drivers (fs-*)" in the Utilities Summary

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