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AHD(4)			 BSD Kernel Interfaces Manual			AHD(4)

     ahd -- Adaptec PCI/PCI-X Ultra320 SCSI host adapter driver

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

	   device pci
	   device scbus
	   device ahd

	   To compile in debugging code:
	   options AHD_DEBUG
	   options AHD_DEBUG_OPTS=<bitmask of options>

	   To configure	one or more controllers	to assume the target role:
	   options AHD_TMODE_ENABLE=<bitmask of	units>

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


     This driver provides access to the	SCSI bus(es) connected to Adaptec
     AIC79xx host adapter chips.

     Driver features include support for narrow	and wide busses, fast, ultra,
     ultra2, ultra160, and ultra320 synchronous	transfers, packetized trans-
     fers, tagged queueing, 512	SCB's, and target mode.

     The AHD_DEBUG_OPTS	option is used to control which	diagnostic messages
     are printed to the	console	when AHD_DEBUG is enabled.  Logically OR the
     following bits together:

	   Value    Function
	   0x0001   Show miscellaneous information
	   0x0002   Show sense data
	   0x0004   Show Serial	EEPROM contents
	   0x0008   Show bus termination settings
	   0x0010   Show host memory usage
	   0x0020   Show SCSI protocol messages
	   0x0040   Show mode pointer of the chip register window
	   0x0080   Show selection timeouts
	   0x0100   Show FIFO usage messages
	   0x0200   Show Queue Full status
	   0x0400   Show SCB queue status
	   0x0800   Show inbound packet	information
	   0x1000   Show S/G list information
	   0x2000   Enable extra diagnostic code in the	firmware

     The AHD_REG_PRETTY_PRINT option compiles in support for human-readable
     bit definitions for each register that is printed by the debugging	code.
     However, it also bloats the compiled size of the driver by	approximately

     Individual	controllers may	be configured to operate in the	target role
     through the AHD_TMODE_ENABLE configuration	option.	 The value assigned to
     this option should	be a bitmap of all units where target mode is desired.
     For example, a value of 0x25 would	enable target mode on units 0, 2, and
     5.	 Note that target mode is only supported for ultra160 speeds and be-

     Per target	configuration performed	in the SCSI-Select menu, accessible at
     boot, is honored by this driver.  This includes synchronous/asynchronous
     transfers,	maximum	synchronous negotiation	rate, wide transfers, discon-
     nection, and the host adapter's SCSI ID.

     The ahd driver supports the following:

     o	 Adaptec AIC7901 host adapter chip
     o	 Adaptec AIC7901A host adapter chip
     o	 Adaptec AIC7902 host adapter chip
     o	 Adaptec 29320 host adapter
     o	 Adaptec 39320 host adapter
     o	 Many motherboards with	on-board SCSI support

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

     The ahd driver first appeared in FreeBSD 4.7.

     The ahd driver, the AIC7xxx sequencer-code	assembler, and the firmware
     running on	the aic79xx chips was written by Justin	T. Gibbs.  This	manual
     page is based on the ahc(4) manual	page.

     The current generation of 79xx chips do not support target	mode in	Ul-
     tra320 mode.  Target mode in general has not been well tested in this

BSD				 July 4, 2004				   BSD


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