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AHA(4)		       FreeBSD Kernel Interfaces Manual			AHA(4)

     aha -- Adaptec SCSI host adapter driver

     To	compile	this driver into the kernel, place the following lines in your
     kernel configuration file:

	   device scbus
	   device aha

     Alternatively, to load the	driver as a module at boot time, place the
     following line in loader.conf(5):


     In	/boot/device.hints:"isa"

     This driver provides access to the	SCSI bus connected to the Adaptec
     AHA-154x and AHA-1640 SCSI	host adapters.	x is 0 for controllers without
     a floppy drive and	2 for controllers that have them.  For optimum perfor-
     mance, Adaptec AHA-174x controllers should	be configured in enhanced mode
     and attached via the ahb(4) driver.

     One device	hint entry for every card to be	attached by the	system is
     required.	Specific values	for the	port address, IRQ, and DRQ may be
     specified.	 If wildcard values are	used, the driver will query the	device
     for its current settings and use those.  If the port address is a wild-
     card, the driver consults an internal table of possible port address
     locations and attaches to the first unattached card it finds.  The	possi-
     ble port addresses	for this card are 0x330, 0x334,	0x230, 0x234, 0x130,
     and 0x134.

     The AHA-1640 is an	MCA bus	card.  Since the MCA bus is a self-identifying
     bus, no setting of	hints is required.

     The aha driver supports the following SCSI	host adapters:

     +o	 Adaptec AHA-154xB
     +o	 Adaptec AHA-154xC
     +o	 Adaptec AHA-154xCF
     +o	 Adaptec AHA-154xCP
     +o	 Adaptec AHA-1640
     +o	 Adaptec AHA-174x in 154x emulation mode
     +o	 DTC 3290 SCSI controller in 1542 emulation mode
     +o	 Tekram	SCSI controllers in 154x emulation mode

     ahb(4), ahc(4), aic(4), cd(4), da(4), sa(4), scsi(4)

     The aha driver was	ported by M. Warner Losh from the bt driver written by
     Justin T. Gibbs.

     The AHA-154xA card	does not support residuals on data transfers.  As a
     result, this card is no longer supported.

     There have	been some reports that the AHA-154xB does not work well	under
     heavy load.

     The AHA-154xCP is a plug and play controller.  However, its resources are
     set using the on-board BIOS and cannot be moved.  Failures	to attached
     for this card are often caused when the resources set in the BIOS con-

FreeBSD	6.3			 July 4, 2004			   FreeBSD 6.3


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